english USER’S MANUAL w w w. p r o e l g r o u p .
DSO480 Quick Reference Editing channels : press channel’s GAIN key. First press accesses that channel’s gain. To scroll through channel’s parameters, use the BACK and NEXT keys. Second press accesses last viewed parameter. Third press will drop back to the default screen. Accessing menus: press the MENU key. Use the BACK and NEXT keys to select the sub‐menu required, and enter the sub‐menu using the ENTER key. This applies to all levels of menu. ENTER always confirms selections.
Contents Important Safety Information 6 Thanks 7 Unpacking the unit 7 Introduction 8 Front Panel Familiarisation 9 Features 8 Rear Panel Connections 10 Operating the DSO480 11 Preliminary Set-up Input Channel Makeup Output Channel Makeup 12 12 Preset Routing Configurations 11 12 Free Assign Routing 15 Base Delay 16 Input Gain 16 Input Parametric EQ 16 Output Gain 17 Output Polarity 17 Output Delay 17 Output High Pass Filter 18 Output Parametric EQ 18 Output Low Pass F
Time Alignment Parametric Filter Types and Their Uses Standard Parametric EQ Shelving EQ (High Shelf shown) Creating a Flat-topped EQ Response Bandpass Filter Notch Filter All Pass Filter Phase Filter Low/High Pass Variable ‘Q’ Filter (Low Pass shown) Elliptical filters 33 34 35 35 36 36 37 37 38 38 34 Factory presets 39 Warranty 39 Specifications 40 5
An example of this equipment has been tested and found to comply with the following European and international Standards for Electromagnetic Compatibility and Electrical Safety: Radiated Emissions (EU): EN55013‐1 (1996) RF Immunity (EU): EN55103‐2 (1996) RF Immunity, ESD, Burst Transient, Surge, Dips &Dwells Electrical Safety (EU): EN60065 (1993) Important Safety Information Do not remove Covers. No user serviceable parts inside, refer servicing to qualified service personnel.
FEDERAL COMMUNICATIONS COMMISSION This is a class A digital device, which is marked for use in a commercial, industrial or business environment, exclusive of used by the general public or used in the home. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Introduction The DSO480 is powerful DSP based audio processors, ideally suited for install applications, where they combine the functions of a multitude of conventional products in a compact 1U unit with extensive remote control capabilities. To achieve this, the units have up to four inputs and eight outputs which can be configured in a selection of basic crossover modes – 4 x 2 way; 2 x 3 way + 2 Aux; 2 x 4 way; and 1 x 8 way (as applicable to i/o configurations).
Front Panel Familiarisation LCD Screen: Shows, by default, the name of the last recalled memory on the bottom line of the screen, and the current routing on the top line. Also used to show all parameters as they are edited, and all menu selections. Control Keys: Selection and adjustment of parameters. NEXT key moves forward through list of parameters. BACK key moves backwards through list of parameters.
Rear Panel Connections Power Switch: turns the unit’s mains supply off and on. Mains Fuse: located in a finger‐proof holder adjacent to the mains inlet. A spare fuse is also located in this holder. Mains Inlet: connected via a standard IEC socket. Always replace the fuse with the correct type and rating as shown on the rear panel legend. RS232: RS232 standard via a 9 pin D‐type connector, for connection to a PC. Audio Outputs: 3 pin XLR sockets are provided for each channel.
Operating the DSO480 Preliminary Set‐up The procedure below should be followed when first installing a DSO480 unit. Design your crossover! To do this, press MENU, and use the BACK or NEXT key to select ‘Crossover sub-menu’ and then press ENTER. Use the BACK or NEXT key to select ‘Design a crossover’ and then press ENTER. Finally, use the BACK or NEXT key to select the desired routing1 and follow the set‐up wizard to finalise your design. Note that when in a menu, ENTER is always used to confirm selections.
Routing Options and Processing Blocks Due to the completely new DSP platform, the routing possibilities within the DSO480 have been made completely flexible, with a matrix available allowing any combination of inputs to be routed to any output. The additional DSP power has permitted the inclusion of more processing blocks, even considering the extra inputs and outputs, and the doubling of sample rate.
4 x 2 way crossover: As shown, each input feeds a pair of outputs, odd numbers being the low frequency split, and even numbers being the high part of the spectrum. Default suggested crossover frequencies are shown by each output. 2 x 3 way crossover: Inputs A and B feed three outputs each, with output 7 being fed from input C, and output 8 from input D. Note the ‘Aux’ outputs are set to full range. Default suggested crossover frequencies are shown by each output.
2 x 4 way crossover: Inputs A and B feed four outputs each, with inputs C & D being unused. Default suggested crossover frequencies are shown by each output. 1 x 8 way crossover: Inputs A is fed to all eight outputs, with initial settings being all full bandwidth. The crossover points can be adjusted as desired.
Free Assign Routing If none of the preset configurations are appropriate to the required system setup, it is possible to manually select the routing of the crossover. This is achieved through the Crossover Menu -> Design A Crossover. Pressing ENTER will start the crossover design wizard, with the first option being to choose the routing. The display will show Design A Crossover -> Routing = 2 X 4 WAY * or whatever the current configuration is set to.
Editing Audio Parameters – Input Channels Input Gain The range of the control over the input gain is –40 dB to +6 dB in 0.1 dB steps. InA Input A Gain Input Gain = +6.0dB Gain Base Delay The maximum available delay between any input and output is 650.00 ms. For example, if the input delay on channel A is set to 500 ms, the maximum available output delay for any output fed from input A will be 150 ms. The readout units can be changed between time in milliseconds, distance in feet or distance in metres.
Editing Audio Parameters – Output Channels Output Gain The range of the control over the input gain is –40 dB to +15 dB in 0.1 dB steps. OP1 Output 1 Gain Output Gain = +6.0dB Gain Output Polarity The polarity (or phase) of each output may be switched individually as below. OP1 Output 1 Polar. Polarity = [+] - or + Output Delay The maximum available delay between any input and output is 650.00 ms.
Output High Pass Filter The high pass crossover filter on each output has a frequency range of <10 Hz up to 32 kHz in 1/36th Octave steps. If you try to set the high pass filter to a higher frequency than the low pass (which would be pointless and result in no output), the message High/Low Freq. Overlap! will be displayed. Note that to access the 48 dB/Octave filters, parametric bands 6 & 7 need to be bypassed, or set to 0 dB.
Output Limiter The limiter on each output has adjustable attack and threshold, with a release time that is selectable to be a multiplier of the attack time. For example, as shown below, the attack time is 2 ms and release is “x16” so 32 ms. The attack and release times can be automatically linked to the high pass filter frequency, so that they are set to correct values for the output’s frequency range. If this feature is enabled, the display will show Automatic T/C in place of the attack and release times.
Ganging=Free Assign [choose ganging] Ganging=1+2+3+4+5+6+7+8 [1 x 8 way] Ganging=1+5 2+6 3+7 4+8 [4 x 2 way] Ganging=1+3+5+7 2+4+6+8 [2 x 4 way] Selecting Free Assign and then pressing ENTER will begin the process of ganging outputs together using the following simple rules: All outputs are ganged to the lowest number – so to gang 3 & 5, 5 must be selected and then ganged to 3.
Menu System Overview Below is an overview of the menu system – a lot of functions have been assigned menu shortcuts – these are accessible directly from the default screen by pressing MENU followed by the appropriate MUTE or EDIT button as shown. This table only shows the top level of each menu item – some of these will start wizards or access additional functions, and these will be explained in later sections. Note that currently the menu shortcuts only apply to the DP448.
Menu System Shortcuts A lot of functions have been assigned menu shortcuts – these are accessible directly from the default screen by pressing MENU followed by the appropriate MUTE or EDIT button as shown. The entire list of features accessible in this way is given below.
Menus in Detail GLOBAL MEM. Recall a Memory Recall Input and Crossover Memories or combinations of. Store a Memory Store Input and Crossover Memories or combinations of. Erase a Memory Erase Input and Crossover Memories or combinations of. INPUT SECTION Input Ganging Input Reset Gang (link) inputs together so their parameters track. Start wizard to reset sections of input parameters. CROSSOVER Design a Crossover Crossover Ganging Set up a new crossover from scratch.
SECURITY Unit Locking Protect the unit against unauthorised access with a password ‐ please see page 27 for more details. AES/EBU AES Status Info. Information screen showing details of the incoming AES streams (sample rate/lock). Memory Structure The DSO480 have their memories split into sections, allowing independent recall of crossover settings (i.e. all parameters associated with outputs), and input settings.
Remote Control Interface Operation RS232 Interface This interface is fitted as standard to all units and is accessed via the 9‐pin D‐type connector on the rear of the unit. Note that to connect to a computer’s COM (serial) port correctly, a one‐to‐one cable must be used, and NOT a ‘null modem’ cable. A ‘null modem’ cable has the ‘transmit’ and ‘receive’ wires swapped over and will not work. The RS232 connection is suitable for distances of about a maximum of 25 feet between the PC and the unit.
Loading New Software via a PC The unit’s internal software may be updated via the RS232 port ONLY, one unit at a time. We recommend disconnecting all other devices when updating the software. The unit’s interface must be set as RS232 Master on ID1 for the PC loader program to recognise it and allow the update to be sent. Download the latest version of the loader program and the unit software from www.proelgroup.com, and follow the instructions included with this zip file.
Security and Locking After selecting the Security Sub Menu and pressing ENTER, select one of the lock types, choosing the most appropriate one for your application. As ever, ENTER will confirm your selection. User Specific Upon pressing ENTER to select this type of lock, each parameter group is presented in turn. Choose the type of lock (as above) using the FREQ encoder, and press ENTER to confirm each parameter. After the last parameter, the unit requests a password.
Unlocking the Unit To unlock the unit press ENTER and then type the code in. This can be entered by using the FREQ control to select a character, and the BACK and NEXT keys to move to the next character. Alternatively, the EDIT keys can be used to enter a code by pressing any combination of the eight buttons. Each EDIT key represents its channel labelling, as described in the locking section. Forgotten the Password? Don’t panic! Your unit can still be unlocked.
Program Limiter and “D‐Max” Limiter The DSO480 units have two levels of dynamic protection on its outputs – a traditional program limiter, and a newly introduced “D‐Max” limiter. Program Limiter High performance digital limiters are provided for each output with control over attack time, release time and threshold parameters ‐ see page 29 for details. This level of control allows the user to balance the required subjective quality of the limiter against the driver protection requirements.
Consider the situation of a monitor engineer listening to a band perform. Having no access to dynamics processors, he has had to resort to manually ‘riding the faders’ in an attempt to keep control of the levels. Should the level of one of the channels on his desk reach an unacceptably high level, he will turn it down appropriately. There is a hidden sidechain in operation even in this case. The main signal path is fed through the monitor desk and the gain controlled by adjusting the fader.
The DSO480’s “D‐Max” limiter predelays the sidechain signal, resulting in a “zero overshoot” limiter, which is able to catch all peaks and provide a reliable absolute maximum setting for the output of any channel. The predelayed sidechain is shown in green, with the main signal in red. As the main signal arrives slightly after the sidechain, the output from the unit does not suffer from the overshoot problem.
Setting Accurate Limiter Thresholds The limiters built into the DSO480 is intended to be used for loudspeaker driver protection, as opposed to amplifier protection. All modern professional power amplifiers designed for live sound use have their own limiters, which are tailored to protecting the amplifier from clipping. The following section describes how to set up the units’ limiters to provide exceptional protection against driver overheating, and cone over‐excursion.
Note that, for safety, always set the limiter threshold 1 or 2 dB below the maximum allowable worked out using the above method. ALWAYS REFER TO YOUR SPEAKER MANUFACTURER FOR LIMITER SETTINGS. Crossover Filter Slopes It should also be noted that the turnover frequency displayed on the screen is the ‐3 dB point for all types except Linkwitz‐Riley where the ‐6 dB point is shown.
Parametric Filter Types and Their Uses A wide selection of filter types has been made available under the PEQ section when editing input or output filters. Scrolling through the various filter types is achieved by repeated presses of the ENTER key. Note that this will only change filter types if the filter is BYPASSED or the GAIN set to 0 dB. Bypassing the filter, then changing types using the ENTER key will automatically set the gain back to 0 dB.
Shelving EQ (High Shelf shown) InA Input A HSF:1-<:: 1k00Hz Q=3.0 0.0dB Remember – to change filter types, press BYPASS to bypass the filter, and then use ENTER to select the filter type. The shelving EQ has adjustable frequency, ‘Q’ (or Bandwidth) and Gain controls. These affect a range of frequencies from the turnover freqency as shown in the graph. For a high shelf, frequencies above the turnover frequency will be affected. For a low shelf, frequencies below the turnover frequency will be affected.
Bandpass Filter InA Input A BPS:1/\ 1k00Hz Q=3.0 Bandpass Remember – to change filter types, press BYPASS to bypass the filter, and then use ENTER to select the filter type. The bandpass filter has adjustable frequency and‘Q’ (or Bandwidth) controls. These affect a range of frequencies symmetrically about the centre freqency as shown in the graph, gradually cutting the level, but providing no gain.
All Pass Filter InA Input A APF:10 1k00Hz Q=3.0 Allpass Remember – to change filter types, press BYPASS to bypass the filter, and then use ENTER to select the filter type. The allpass filter has adjustable frequency and ‘Q’ (or Bandwidth) controls. These affect the frequency at which the phase effectively flips 180°, and the ‘speed’ at which this transition occurs. The graph shows an allpass filter centred at 1 kHz, with various ‘Q’ settings – the higher the ‘Q’ the faster the transition.
Low/High Pass Variable ‘Q’ Filter (Low Pass shown) InA Input A LPF:1~~\ 1k00Hz Q=3.0 LPF VarQ Remember – to change filter types, press BYPASS to bypass the filter, and then use ENTER to select the filter type. The low and high pass variable ‘Q’ filters have adjustable frequency and ‘Q’ (or Bandwidth) controls. The ‘Q’ control adjust the damping of the filter, so that low ‘Q’ settings show less overshoot at the turnover frequency, but also slower roll‐off.
The graph shows three different low pass filter shapes. Number 1 is a standard 24 dB/Octave Linkwith‐Riley curve. Number 2 is a 48 dB/Octave Linkwitz‐Riley. As can be seen, number 2 is significantly steeper in roll‐ off than number 1, as would be expected. However, number 3 is a 12 dB/Octave Butterworth filter with an Elliptical Low Pass filter following it.
Specifications Inputs: 4 electronically balanced Impedance: > 10k ohms. CMRR : >65 dB 50 Hz – 10 kHz. Outputs: 8 electronically balanced Source Imp: < 60 ohms Min. Load: 600 ohm Max. Level: +20 dBm into 600 ohm Frequency Resp.:+½ dB 20 Hz‐20 kHz ‐3 dB @ 32 kHz Dyn. Range:>116 dB 20 Hz‐20 kHz unwtd Distortion:< .02%@1 kHz,+18 dBm Maximum Delay: 650 mS Min Step Size: 0.3 µS Input Gain: +6 dB to –40 dB in 0.1 dB steps Output Gain: +15 dB to –40 dB in 0.
Index A H AES Interface ∙ 26 AES Menu ∙ 23 All Pass ∙ 37 Attack Times ∙ 29 High Pass Filter ∙ 18 B Bandpass ∙ 36 Base Delay ∙ 16 I Input Gain ∙ 16 Input Section Menu ∙ 23 Interface RS232 ∙ 25 USB ∙ 25 Interface Menu ∙ 23 C L Clip Limiter ∙ 19; 29 Crossover Menu ∙ 23 D Delay ∙ 16 Look Ahead ∙ 29 Digital In ∙ 26 D‐Max ∙ 29 Limiter Overshoot Prevention ∙ 31 Limiter Threshold ∙ 32 Limiters ∙ 29 Load New Software ∙ 26 Lockouts ∙ 27 Look Ahead ∙ 29 Look Ahead Delay ∙ 29 Low Pass Filter ∙ 18 E M Editi
Passwords ∙ 27 Phase ∙ 37 Polarity ∙ 17; 37 Program Limiter ∙ 19 Sidechain Delay ∙ 29 System Menu ∙ 23 U R Release Times ∙ 29 Resonant Filter ∙ 38 Routing ∙ 15 Basic ∙ 12 Free Assign ∙ 15 Presets ∙ 12 RS232 Interface ∙ 25 S Security ∙ 27 Security Menu ∙ 23 42 Unlocking ∙ 28 Updating Software ∙ 26 Upgrading ∙ 26 USB Interface ∙ 25 V Vari‐Q ∙ 38
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