Interfacing to the SoundStation VTX 1000 ® with Vortex Devices Application Note Polycom Installed Voice Business Group September 2004 Rev.
TABLE OF CONTENTS TABLE OF CONTENTS......................................................................................................................... 2 INTRODUCTION................................................................................................................................... 6 SUMMARY............................................................................................................................................ 7 SYSTEM OVERVIEW .........................................
8.) CONNECTING OTHER SOURCES TO A VORTEX DEVICE ...................................................... 25 Vortex Input Wiring....................................................................................................................................... 25 Balanced Input.............................................................................................................................................................25 Unbalanced Input..........................................................
Presets.......................................................................................................................................................................................... 61 16 Mics, 8 Loudspeakers, 2 Zones Sound Reinforcement............................................................................ 62 Introduction / Room Layout .........................................................................................................................................62 System Layout .
Cable Drawing 3: Unbalanced Output to Vortex Input Connection............................................................................99 APPENDIX D: VORTEX OUTPUT WIRING .................................................................................. 100 Cable Drawing 1: Vortex Output to Balanced Input .................................................................................................100 Cable Drawing 2: Vortex Output to Unbalanced Input...................................................
INTRODUCTION TM This application note explores how to configure the SoundStation VTX 1000 to send and receive audio to a Vortex• EF2280, EF2241, EF2210, or EF2211 device. The SoundStation VTX 1000 is the first voice conferencing phone to offer wideband capability over the public switched telephone network. The SoundStation VTX 1000 is capable of sending up to 7 kHz signal over a telephone line.
SUMMARY If you are already familiar with Vortex devices, you may not need to read the entire application note. Here is a quick overview of the entire process: 1. Connect the microphones to the Vortex device(s). Make sure phantom power is enabled for microphones that require it. For wireless microphones, phantom power is not needed. 2. Connect the loudspeakers to the Vortex device(s).
SYSTEM OVERVIEW Below are three system examples that illustrate the signal flow between a Vortex device and a SoundStation VTX 1000. VOICE (NARROWBAND AND WIDEBAND) Here, a local talker uses a Vortex device and a SoundStation VTX 1000 to send audio, both narrowband and wideband, to a remote person via the Public Switched Telephone Network (PSTN). We will assume that the Remote Talker has a SoundStation VTX 1000 and can receive wideband calls.
VOICE (NARROWBAND AND WIDEBAND) AND VIDEO Here, a local talker uses a Vortex device, a SoundStation VTX 1000, and a video codec to send audio to two remote people. We will assume that Remote Talker 1 has a SoundStation VTX 1000 and can receive wideband telephone calls. The Vortex device receives audio from a microphone in the local room and sends the remote speech from both sources to a loudspeaker also in the local room.
NARROWBAND VOICE VIA VORTEX HYBRID AND WIDEBAND VOICE THROUGH SOUNDSTATION VTX 1000 Here, a local talker uses a Vortex device, a Vortex Phone Hybrid, and a SoundStation VTX 1000 to send audio to two remote people. We will assume that Remote Talker 1 has a SoundStation VTX 1000 and can receive wideband telephone calls. We will also assume that Remote Talker 2 has a non-SoundStation VTX• 1000 (i.e. SoundStation EX) that only receives narrowband calls.
SYSTEM SETUP DIRECTIONS Here is a step-by-step list of directions that one should follow in setting up a conference room to work with a SoundStation VTX 1000 and a Vortex device: 1. 2. 3. 4. 5. 6. 7. 8. Connect the microphones to the Vortex device(s). Connect the loudspeakers to the Vortex device(s). Connect the SoundStation VTX 1000 phone to a Vortex device. Optionally connect a subwoofer to the Vortex device. Connect the telephone line to the SoundStation VTX 1000 and Vortex device.
1.
PHYSICAL CONNECTIONS We use terminal blocks to make the audio connections to the printed circuit board. We use 3.5 mm pitch plugs. Looking left to right, the conductors are positive, negative, shield (where shield is connected to chassis ground of the Vortex device): USING WIRED MICROPHONES Most wired microphones will have a male XLR connector on the end of its cable. As a result, you will need to make a XLR to Phoenix converter cable.
If the cable that comes with the microphone is long enough to reach the Vortex device, you may cut off the male XLR connector and use wire strippers to remove the outer sheath and any shielding of the conductors. This will allow you to connect the wire directly to one of the provided Phoenix connectors. USING WIRELESS MICROPHONES All wireless microphones will require the use of a receiver to demodulate the signal.
2.) CONNECTING A LOUDSPEAKER TO A VORTEX DEVICE There are two ways to connect a loudspeaker (or multiple loudspeakers) to a Vortex device: Via an amplifier or via the loudspeaker output of a Vortex EF2241, EF2210, or EF2211. If your loudspeaker has a 70V transformer on it, you will need an external amplifier to power the loudspeaker.
EXTERNAL AMPLIFIER Here, one of the line-level outputs of a Vortex EF2241 is sent to an amplifier to power a group of loudspeakers. EXTERNAL AMPLIFIER INPUTS All amplifiers will have one of two types of connectors: XLR or RCA: An XLR connector uses two conductors (positive and negative) and a ground line to transfer signal from one device to another device. This is referred to as "balanced". Pin 1 is shield, Pin 2 is positive, and Pin 3 is negative.
"unbalanced". The signal conducting part of the connector is called "tip" and the ground line is called "shield". If the input of the amplifier has a balanced input, connect the Positive conductor of the Vortex device to Pin 2 of the XLR connector, the Negative conductor of the Vortex device to Pin 3 of the XLR connector, and the Shield of the Vortex device to the Pin 1 of the XLR connector. Refer to Cable Drawing 1 in the Vortex Output Wiring section of the Appendix.
3.) CONNECTING THE SOUNDSTATION VTX 1000 TO A VORTEX DEVICE In order to send and receive audio to the SoundStation VTX 1000 Interface Module, you need to observe the following wiring procedure: 1.) Connect the Auxiliary Output of the Interface Module to a line level input of a Vortex device. 2.) Connect Output B the Vortex device to the Auxiliary Input of the Interface Module. By default, Outputs A, B, and C of the Vortex device is a mix-minus version of the Input B signal.
INPUT TO INTERFACE MODULE FROM OUTPUT OF VORTEX DEVICE Connect the Positive conductor of the Vortex device to the Tip of the RCA connector and the Negative conductor of the Vortex device to Shield of the RCA connector. The shield of the cable is not connected. Refer to Cable Drawing 2 in the Vortex Output Wiring section of the Appendix.
A subwoofer can be used with the SoundStation VTX 1000 to enhance the low frequency response when connected to another party via wideband mode. The use of the subwoofer is optional when using the Vortex as there may be other loudspeakers in the room that you may wish to use. If you do want to use a subwoofer, you can connect an output of the Vortex directly to the subwoofer as a subwoofer typically accepts a line level input.
1.) Connect the wall jack to the LINE jack connection on the back of the Vortex EF2241 (or Vortex EF2201 or Vortex EF2211). Connect the PHONE jack of the Vortex EF2241 to the phone jack on the VTX Interface Module. This method will be required if you want to control the narrowband telephone calls with a control system (AMX or Crestron). If the telephone portion of the Vortex EF2241 is active, the PHONE jack of the Vortex EF2241 is disabled until the Vortex EF2241 is placed on-hook.
6.) VERIFYING THE PROPER FIRMWARE IN THE SOUNDSTATION VTX 1000 AND THE VORTEX DEVICE In order for the SoundStation VTX 1000 to work correctly with Vortex devices, the firmware must be upgraded to Version 1.22 (August 26, 2003) or higher. Please refer to the SoundStation VTX 1000 User's Guide / Administrator's Guide for the proper instructions. To upgrade the firmware in the Vortex device, please consult the CONFERENCE COMPOSER HELP FILE.
signals to the Vortex as well as to make wideband audio calls. The default settings for the SoundStation VTX 1000 will not allow one to send and receive audio from the VTX into the Vortex. We will discuss how to setup the Vortex device in Step 10. You must perform this step; otherwise, you will not be able to operate the SoundStation VTX 1000 properly. Enable Vortex Mode in the SoundStation VTX 1000. Press the MENU key and the select ADMIN SETUP.
8.) CONNECTING OTHER SOURCES TO A VORTEX DEVICE All Vortex devices (except the Vortex EF2201) have line level inputs and outputs that may be used to bring in other sources into the system. These are sources such as video codecs, laptop computers, CD players, DVD players, VCR's, and audio recorders. There are specific wiring methods that we recommend for connecting balanced and unbalanced sources to all Vortex devices. We will assume that balanced inputs and outputs use XLR connectors.
VORTEX OUTPUT WIRING BALANCED INPUT Connect the Positive conductor of the Vortex device to Pin 2 of the XLR connector, the Negative conductor of the Vortex device to Pin 3 of the XLR connector, and the Shield of the cable to the only to the Vortex device. Refer to Cable Drawing 1 in the Vortex Output Wiring section of the Appendix.
MICROPHONE LEVELS For wired microphones, the input gain is dependant on the sensitivity of the microphone as well as the typical distance from the talker to the microphone. Type of Microphone Tabletop Ceiling Podium Gooseneck Wireless Average Level Mic Mode, 15 dB Mic Mode, 25 dB Mic Mode, 10 dB Mic Mode, 5 dB Depends on the receiver* *Some wireless receivers transmit audio at line level (approximately 0 to -10 dB) and others transmit at mic level (approximately -30 dB).
Once the external devices have been wired to the Vortex device, the Input and/or Output gain of the Vortex device needs to be set to match the nominal level of the external devices. Here is a table that references the types of connectors to the proper input / output level: Connector Type RCA 1/8 inch XLR Phoenix / Terminal Block Input Gain +10 dB +10 dB 0 dB 0 dB Output Gain -10 dB -10 dB 0 dB 0 dB The issue of nominal levels is important because it will affect the gain structure of the Vortex device.
1. Enable SoundStation VTX 1000 Mode for the appropriate input of the Vortex device. This can be done from Conference Composer or via the front panel of the unit. In Conference Composer, go to the Inputs page and click the SoundStation VTX 1000 Mode button: From the front panel, go to the VORTEX INPUT SETTINGS menu item, press ENTER, select the appropriate input, use the DOWN or UP buttons to scroll the menu items until you see VTX MODE. Press ENTER, UP, and then ENTER to enable VTX Mode. 2.
From the front panel, go to the VORTEX OUTPUT SETTINGS menu item, press ENTER, select the appropriate input, use the DOWN or UP buttons to scroll the menu items until you see VTX MODE. Press ENTER, UP, and then ENTER to enable VTX Mode. 11.
SOUNDSTATION VTX 1000 1. Press the PHONE BUTTON. You should hear a dial tone in the room if the interface module is connected to a analog telephone line. 2. Dial a telephone number via the Keypad. 3. If the far end has also has a SoundStation VTX 1000, you will connect in wideband mode. 4. Use the VOLUME UP and DOWN buttons to control the far end volume. 5. Use the MUTE button to mute the local audio to the far end. The MUTE button does not effect the far end audio into the local room. 6.
8 MICS, 4 LOUDSPEAKERS INTRODUCTION / ROOM LAYOUT This example illustrates a 23 ft. X 17 ft. X 10 ft. conference room that has 8 tabletop microphones and 4 ceiling loudspeakers. The system includes a Vortex EF2280 matrix mixer, a video codec, a program audio source, and the SoundStation VTX 1000. There is no sound reinforcement in this room.
SYSTEM LAYOUT The audio components for the room are 8 tabletop microphones, 1 Vortex EF2280, 1 video codec, 1 program audio source, 1 SoundStation VTX 1000, and 4 ceiling loudspeakers. The interface module will use Input B / Output B. The video codec will use Input A / Output A. The program audio will use Inputs C and D. The amplifier will use Output C and a subwoofer will use Output D. We will assume that the microphones and amplifier have balanced connections (.775 Vrms professional nominal levels).
CONFERENCE COMPOSER LAYOUT Most of the default parameters of the Vortex EF2280 will satisfy our design. However, we will need to change the Mic/Line Inputs, Matrix Mixer, Output Filters, Outputs, and Presets to satisfy our design goals. Mic/Line Inputs The VTX Mode Option for Input B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls.
Matrix Mixer The matrix mixer will need to be changed from the default settings in order to use Output A for the Video Codec, Output B for the Interface Module, Output C for the Amplifier, and Output D for the Subwoofer. Inputs 1-8 need to be assigned to Outputs A and B so that the people on the far end of a SoundStation VTX 1000 or video codec call can hear the local microphones. The cross-points are colored blue to indicate that they are gated to Outputs A and B.
Output Filters 38
Since we have the SoundStation VTX 1000's subwoofer in the system design, we need to use filters to direct the energy of the incoming signal to the appropriate loudspeakers. Since the subwoofer is designed to handle low frequency energy, a Linkwitz-Riley low pass filter has been assigned to Output D. The cutoff frequency is 250 Hertz, meaning that above that frequency, the signal will be attenuated at a rate of 12 dB / octave. The ceiling loudspeakers may not be able to reproduce low frequency energy.
the signal will be attenuated at a rate of 12 dB / octave. Outputs The VTX Mode Option for Output B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls.
Presets In order to permanently save the settings to the Vortex EF2280, you must use a User Preset. Here, we've used PRESET 16, although you may use any of the User Presets 16-47 to accomplish this task. We've also renamed USER PRESET 16 to CONFERENCE ROOM.
the POWER ON PRESET to reflect the proper Preset that you want the unit to power up to if the unit loses AC power.
REINFORCEMENT INTRODUCTION / ROOM LAYOUT This example illustrates a 24 ft. X 50 ft. X 10 ft. conference room that has 12 tabletop microphones and 8 ceiling loudspeakers. The system includes a Vortex EF2280 matrix mixer, a Vortex EF2241 matrix mixer / telephone hybrid, a video codec, the SoundStation VTX 1000, and a program audio source. We want both Vortex devices to function as one automixer so as to allow only four microphones to gate on at any one time.
SYSTEM LAYOUT The audio components for the room are 12 tabletop microphones, 1 Vortex EF2280, 1 Vortex EF2241, 1 video codec, 1, 4-channel amplifier, 1 program audio source, 1 SoundStation VTX 1000, and 8 ceiling loudspeakers. Microphones 1-8 will use Inputs 1-8 on the Vortex EF2280 and Microphones 9-12 will use Inputs 1-4 on the Vortex EF2241. The video codec will use Input A / Output A of the Vortex EF2280. The program source will use Inputs B and C of the Vortex EF2280.
CONFERENCE COMPOSER LAYOUT VORTEX EF2241 Most of the default parameters of the Vortex EF2241 will satisfy our design such as microphone gains. However, we will need to re-label the EFBus for clarity and change the Options, Mic/Line Inputs, Automixer, Matrix Mixer, Output Filters, Outputs, and Presets to satisfy our design goals. Options One of our design goals was to have the Vortex EF2241 automatically hang up if the unit detected a drop in loop current or a call progress tone such as a busy signal.
The VTX Mode Option for Input B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls. Automixer One of our design requirements was to make each Vortex device operate as one 12-channel automixer in order to limit the maximum number of open microphones to 4 across both units. In order to achieve that, we need to set the GLOBAL MAX NOM to 4 on both linked units.
EFBus The default routing of the EFBus will be sufficient for our design. However, for clarity, the labels have been changed to reflect the signals that are placed onto the bus and all unneeded cross-points have been muted. Since the Vortex EF2280 uses the W and Y buses to send microphone, codec, and program audio to the Vortex EF2241 and the ID of the Vortex EF2280 is 00, the audio signals WB0 and YB0 need to be routed to Inputs WM0 and YM0 of the Vortex EF2280.
Matrix Mixer The matrix mixer will need to be changed from the default settings in order to send Inputs 1-4 as well as Output W, X, Y, and Z bus channel. Note that since Inputs 1-4 are microphones, the cross-points are colored blue to indicate that they are gated to Outputs W, X, Y, and Z. The default routing to Output B and T will satisfy our design goals. The outputs P, W, X, Y, and Z are signals that will be sent over the EFBus to the Vortex EF2280.
Output Filters Since we have the SoundStation VTX 1000's subwoofer in the system design, we need to use filters to direct the energy of the incoming signal to the appropriate loudspeakers. Since the subwoofer is designed to handle low frequency energy, a Linkwitz-Riley low pass filter has been assigned to Output D. The cutoff frequency is 250 Hertz, meaning that above that frequency, the signal will be attenuated at a rate of 12 dB / octave.
The VTX Mode Option for Output B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls.
In order to permanently save the settings to the Vortex EF2241, you must use a User Preset. Here, we've used PRESET 16, although you may use any of the User Presets 16-47 to accomplish this task. We've also renamed USER PRESET 16 to CONFERENCE ROOM. Once the User Preset has been saved, you must also change the POWER ON PRESET to reflect the proper Preset that you want the unit to power up to if the unit loses AC power.
Most of the default parameters of the Vortex EF2280 will satisfy our design such as microphone gains. However, we will need to re-label the EFBus for clarity and change the Automixer, Matrix Mixer, Output Filters, and Presets to satisfy our design goals. Automixer One of our design requirements was to make each Vortex device operate as one 12-channel automixer in order to limit the maximum number of open microphones to 4 across both units.
W, X, Y, and Z buses, the Vortex EF2280 assigns that audio to one of three mixes for the W, X, Y, and Z Buses: WM0, WM1, WM2, XM0, XM1, XM2, YM0, YM1, YM2, ZM0, ZM1, or ZM2 where the "M" stands for mix.
amplifier. Inputs A, B, and C need to be assigned to Outputs 1-4 and Y. By default, Inputs 1-8 are routed to Output's A and W. Note that since Inputs 1-8 are microphones, the cross-points are colored blue to indicate that they are gated to Outputs 1-4, B, and W. Inputs B and C are attenuated by 3 dB to Outputs 1-4, A, and R1 because if the left and right channels are mono, both channels will increase 6 dB in gain2.
Output Filters The ceiling loudspeakers may not be able to reproduce low frequency energy. Since the subwoofer that is connected to the Vortex EF2241 handles that function, we will remove low frequency energy from the ceiling loudspeakers via a Linkwitz-Riley high pass filter has been assigned to Outputs 1, 2, 3, and 4. The cutoff frequency is 250 Hertz, meaning that below that frequency, the signal will be attenuated at a rate of 12 dB / octave.
Presets In order to permanently save the settings to the Vortex EF2280, you must use a User Preset. Here, we've used PRESET 16, although you may use any of the User Presets 16-47 to accomplish this task. We've also renamed USER PRESET 16 to CONFERENCE ROOM. Once the User Preset has been saved, you must also change the POWER ON PRESET to reflect the proper Preset that you want the unit to power up to if the unit loses AC power.
16 MICS, 8 LOUDSPEAKERS, 2 ZONES SOUND REINFORCEMENT INTRODUCTION / ROOM LAYOUT This example illustrates a 40 ft. X 18 ft. X 10 ft. conference room that has 16 tabletop microphones and 8 ceiling loudspeakers. The system includes 2 Vortex EF2280 matrix mixers, a video codec, a program audio source, and the SoundStation VTX 1000. There are 2 zones of sound reinforcement in this room. We want both Vortex devices to function as one automixer so as to allow only four microphones to gate on at any one time.
SYSTEM LAYOUT The audio components for the room are 16 tabletop microphones, 2 Vortex EF2280's, 1 video codec, 1 program audio source, 1 SoundStation VTX 1000, 1 Vortex EF2201, and 8 ceiling loudspeakers. Microphones 1-8 will be connected to Vortex EF2280 ID 00 and microphones 9-16 will be connected to Vortex EF2280 ID 01. The interface module will use Input B / Output B. The video codec will use Input A / Output A. The program audio will use Inputs C and D.
CONFERENCE COMPOSER LAYOUT VORTEX EF2280 ID 00 Some of the default parameters of the Vortex EF2280 will satisfy our design. However, we will have to change the Mic/Line Inputs, Automixer, EFBus, Matrix Mixer, Output Filters, Outputs, and Presets to satisfy our design goals. Mic/Line Inputs The VTX Mode Option for Input B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls.
Automixer One of our design requirements was to make all Vortex devices operate as one 16-channel automixer in order to limit the maximum number of open microphones to 4 across both units. In order to achieve that, we need to set the GLOBAL MAX NOM to 4 on all linked Vortex EF2280’s. We will also set the LOCAL MAX NOM to 4 as well. The difference between the Local Max NOM and the Global Max NOM is that the Local NOM refers to the number of microphones that can gated on within a single unit.
Let's look at the 8 signals WB0-WB7 in the above screenshot. These signals are from 7 other Vortex devices. In this example, the Vortex EF2280 has a device ID of 00. As a result, the WB0 column is grayed out because the EF Bus does an automatic mix-minus so that one cannot create a loopback on the EF Bus. The WB1-WB7 inputs can be assigned to one of the three submixes that are available for each bus channel. Here, we are creating three mixes for three different zones.
In order to satisfy the sound reinforcement requirements, Mic 9 in Vortex EF2280 ID 01 has been placed on the W Bus, Mics 10 and 11 have been placed on the X Bus, Mics 12-14 have been placed on the Y Bus, and Mics 15-16 have been placed on the Z Bus.
We will set Output D to -30 dB in order to protect the subwoofer from "bottoming out" on high-amplitude transient sounds. The output R1 is our Acoustic Echo Canceller (AEC) reference signal. This signal is what the internal AEC uses to remove from the local microphones. In our example, we will remove the codec, telephone, SoundStation VTX 1000, and program audio from the local microphones. Note that local microphones are not included in the Reference Signal even though we are reinforcing them.
Output Filters Since we have the SoundStation VTX 1000's subwoofer in the system design, we need to use filters to direct the energy of the incoming signal to the appropriate loudspeakers. Since the subwoofer is designed to handle low frequency energy, a Linkwitz-Riley low pass filter has been assigned to Output D. The cutoff frequency is 250 Hertz, meaning that above that frequency, the signal will be attenuated at a rate of 12 dB / octave.
The ceiling loudspeakers may not be able to reproduce low frequency energy. Since the subwoofer handles that job, we will remove low frequency energy from the ceiling loudspeakers via a Linkwitz-Riley high pass filter has been assigned to Outputs 1 and 2. The cutoff frequency is 250 Hertz, meaning that below that frequency, the signal will be attenuated at a rate of 12 dB / octave.
Outputs The VTX Mode Option for Output B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls.
Presets In order to permanently save the settings to the Vortex EF2280, you must use a User Preset. Here, we've used PRESET 16, although you may use any of the User Presets 16-47 to accomplish this task. We've also renamed USER PRESET 16 to CONFERENCE ROOM. Once the User Preset has been saved, you must also change the POWER ON PRESET to reflect the proper Preset that you want the unit to power up to if the unit loses AC power.
Some of the default parameters of the Vortex EF2280 will satisfy our design. However, we will have to change the Automixer, Matrix Mixer, and Presets to satisfy our design goals. Automixer One of our design requirements was to make all Vortex devices operate as one 16-channel automixer in order to limit the maximum number of open microphones to 4 across both units. In order to achieve that, we need to set the GLOBAL MAX NOM to 4 on both Vortex EF2280’s. We will also set the LOCAL MAX NOM to 4 as well.
Presets In order to permanently save the settings to the Vortex EF2280, you must use a User Preset. Here, we've used PRESET 16, although you may use any of the User Presets 16-47 to accomplish this task.
renamed USER PRESET 16 to CONFERENCE ROOM. Once the User Preset has been saved, you must also change the POWER ON PRESET to reflect the proper Preset that you want the unit to power up to if the unit loses AC power. CONFERENCE COMPOSER LAYOUT VORTEX EF2201 Most of the default parameters of the Vortex EF2201's will satisfy our design.
Options, EFBus, Matrix Mixer and Presets to satisfy our design goals. Options One of our design goals was to have the Vortex EF2201 automatically hang up if the unit detected a drop in loop current or a call progress tone such as a busy signal. To achieve that goal, the AUTO HANGUP (CALL PROGRESS BASED) and the AUTO HANGUP (LOOP DROP BASED) boxes should be checked.
The Vortex EF2201 can place 1 signal on the bus (P) but can retrieve signals from any of the P (except ID 00), W, X, Y, or Z buses; thus, there are 5 sub-matrices to allow flexibility in how the signals from other devices get mixed together and are presented to the main matrix. Inputs to the Submatrix come from the top and outputs are on the left. The "B" part of the inputs stands for bus and the "M" part of the output stands for mix.
mix-minus which allows the user to work with a simple mix-minus sum of all the other devices. If more complicated mixing from other devices is required, any of the matrix rows can have arbitrary cross points gains. Each one of the 8 inputs represents a signal from another unit that is maintained in its discrete form until this submatrix. Here you decide which signals to pull off of the bus, what mixes to create, and what gain or attenuation values to assign to each one of those signals.
Each group of microphones, the codec, and the interface module are sent at 0 dB to Output T. The Program Audio signals are attenuated by 10 dB and then sent to Output T. This is done so that the local and codec speech are "biased" above the program audio. If the program audio is sent at 0 dB to the far side caller, it may be difficult for the far side caller to differentiate between local speech and program audio if both signals are active at the same time.
In order to permanently save the settings to the Vortex EF2201, you must use a User Preset. Here, we've used Preset 16, although you may use any of the User Presets 16-47 to accomplish this task. We've also renamed User Preset 16 to Classroom. Once the User Preset has been saved, you must also change the Power on Preset to reflect the proper Preset that you want the unit to power up to if the unit loses AC power.
VORTEX EF2241 EXAMPLES 12 MICS, 8 LOUDSPEAKERS, 4 ZONES SOUND REINFORCEMENT See the section entitled “12 Mics, 8 Loudspeakers, 4 Zones Sound Reinforcement” in the Vortex EF2280 Examples section. 4 MICS, 2 LOUDSPEAKERS INTRODUCTION / ROOM LAYOUT This example illustrates a 15 ft. X 15 ft. X 10 ft. conference room that has 4 tabletop microphones and 2 ceiling loudspeakers.
SYSTEM LAYOUT The audio components for the room are 4 tabletop microphones, 1 Vortex EF2241, 1 video codec, 1 program audio source, 1 SoundStation VTX 1000, and 2 ceiling loudspeakers. The loudspeakers are wired in parallel to match the load requirements of the loudspeaker output of the Vortex EF2241 (4-8 ohms). Since the loudspeakers have an impedance of 8 ohms each, we can wire them in parallel and then the impedance of both loudspeakers will be 4 ohms.
CONFERENCE COMPOSER LAYOUT Most of the default parameters of the Vortex EF2241 will satisfy our design. However, we will need to change the Mic/Line Inputs, Options, Matrix Mixer, Output Filters, Outputs, and Presets to satisfy our design goals. Options One of our design goals was to have the Vortex EF2241 automatically hang up if the unit detected a drop in loop current or a call progress tone such as a busy signal.
Mic/Line Inputs The VTX Mode Option for Input B needs to be selected so that the SoundStation VTX 1000 can make wideband audio calls. Matrix Mixer The matrix mixer will need to be changed from the default settings in order to use Output B for the Interface Module, Output D for the subwoofer, Output A for the video codec, and Output L for the loudspeaker.
Inputs C and D are attenuated by 3 dB to Outputs D, Y, and R1 because if the left and right channels are mono, both channels will increase 6 dB in gain4. Inputs C and D are reduced by 10 dB to Output B and T because if a program source is mixed at 0 dB with local speech, it may be difficult for the remote person on the telephone to distinguish between the program audio and the local speech due to the frequency limitations of the telephone network.
Since we have the SoundStation VTX 1000's subwoofer in the system design, we need to use filters to direct the energy of the incoming signal to the appropriate loudspeakers. Since the subwoofer is designed to handle low frequency energy, a Linkwitz-Riley low pass filter has been assigned to Output D. The cutoff frequency is 250 Hertz, meaning that above that frequency, the signal will be attenuated at a rate of 12 dB / octave. The ceiling loudspeakers may not be able to reproduce low frequency energy.
the signal will be attenuated at a rate of 12 dB / octave.
wideband audio calls. Presets In order to permanently save the settings to the Vortex EF2241, you must use a User Preset. Here, we've used PRESET 16, although you may use any of the User Presets 16-47 to accomplish this task.
renamed USER PRESET 16 to CONFERENCE ROOM. Once the User Preset has been saved, you must also change the POWER ON PRESET to reflect the proper Preset that you want the unit to power up to if the unit loses AC power.
OVERVIEW Here is a drawing of all the connectors on the SoundStation VTX 1000 Interface Module. WIRING RECOMMENDATIONS / LIMITATIONS The maximum length of the cable that connects the SoundStation VTX 1000 console and the Interface Module is 25 feet (This is the length of cable that is shipped with the SoundStation VTX 1000).
supplied RCA cables to connect the Vortex to the Auxiliary Input and Output jacks on the Interface Module are not long enough, we recommend using a audio transformer to interface between the two devices. The audio transformer will help prevent ground loops that may form over the earth ground if two devices are connected to wall outlets that are separated from each other (i.e. not in one location such as a power strip). We recommend using the Jensen ISO-Max DIN-2LO-11FL.
APPENDIX B: SOUNDSTATION VTX 1000 USER CONTROLS / LCD LAYOUT Here is a drawing of the User Controls and the LCD screen layout of the SoundStation VTX 1000: 98
APPENDIX C: VORTEX INPUT WIRING CABLE DRAWING 1: WIRED MICROPHONE CONNECTION Connect the Positive conductor of the Vortex device to Pin 2 of the XLR connector, the Negative conductor of the Vortex device to Pin 3 of the XLR connector, and the Shield of the Vortex device to the Pin 1 of the XLR connector.
APPENDIX D: VORTEX OUTPUT WIRING CABLE DRAWING 1: VORTEX OUTPUT TO BALANCED INPUT The above diagram illustrates the use of an XLR connector. Connect the Positive conductor of the Vortex device to Pin 2 of the XLR connector, the Negative conductor of the Vortex device to Pin 3 of the XLR connector, and the Shield of the cable to the only to the Vortex device.
APPENDIX E: VORTEX INTERNAL AMPLIFIER WIRING TWO 8 OHM LOUDSPEAKERS CONNECTED IN PARALLEL Here, two loudspeakers labeled R1 and R2 are connected in parallel to Output L. The total resistance of both loudspeakers is 4 ohms. This load is acceptable as it meets the minimum load requirement of the amplifier.
THREE 8 OHM LOUDSPEAKERS CONNECTED IN PARALLEL Here, three loudspeakers labeled R1, R2, and R3 are connected in parallel to Output L. The total resistance of all three loudspeakers is 2.67 ohms. This load is unacceptable as it exceeds the minimum load requirement of the amplifier.
TECHNICAL SUPPORT For support on the Vortex product line, call toll-free (USA/Canada) 888-248-4143, then select option 1, then option 3. For exclusive Integrator and Consultant focused support (through our PASS program), dial 1.408.474.2048; this number will get you help on video and Vortex products. For general technical support, dial 1.800.
