SYSTEM MIX PLUS Owner's Manual DIGITAL MUSIC CORPORATION
1 Table of Contents ________________________________________________________ 1. Introduction . . . . . . . . . . . . . . . . . . 2 1.1 Overview 1.2 Unpacking 2. Operation . . . . . . . . . . . . . . . . . . . 3 2.1 Front Panel 2.2 Rear Panel 3. Mixer . . . . . . . . . . . . . . . . . . . . . 6 3.1 Mix 1 3.2 Mix 2 3.3 Setting Levels 4. MIDI Volume . . . . . . . . . . . . . . . . . 8 4.1 Connections for the Volume Control 4.2 Using the Volume Control with Ground Control 4.
2 1. Introduction ______________________________________________________ 1.1 Overview System Mix Plus is a dual stereo line level audio mixer designed specifically for electric guitar systems. With System Mix Plus, you can combine the line level outputs of your rack effects with the pure tone of your amp or preamp. This results in lower noise and better tone.
3 2. Operation ________________________________________________________ 2.1 Front Panel 1. Power Switch: Applies power to System Mix Plus. 2. MIDI FEED: Direct passive feed thru to the MIDI FEED on the rear panel. 3. Level LEDs: Indicate output level of Mix 1 and Mix 2, not left and right. The thresholds are: +10 dBu (Red) 0 dBu (Yellow) - 10 dBu (Green) - 20 dBu (Green) (Note: 0 dBu = 0.775 volt RMS) When setting levels, the signal peaks should barely light the yellow LEDs.
4 10. MONITOR Ground Lift: Disconnects the sleeve of the MONITOR IN jack from ground with the button pushed in. 11. MONITOR Phase Invert: With the button pushed in, the phase of the MONITOR IN signal is inverted. 12. HEADPHONE LEVEL Direct: Adjusts the headphone volume of your mixer signal. 13. HEADPHONE LEVEL Monitor: Adjusts the headphone volume of the MONITOR IN signal. 14. MONITOR IN: Accepts a stereo (TRS) plug for headphone monitoring of external signals (monitor mixes, etc.) 15.
5 8. Mix 2 Inputs: Four stereo, line level inputs to Mix 2. Note: Mix 2 In 1 controls the internal connection (normal) from Mix 1 to Mix 2. If nothing is plugged in to these inputs, the outputs from Mix 1 feed through to Mix 2. If something is plugged in to these inputs, the internal Mix 1/Mix 2 connection is broken. 9. Mix 2 Out: Left and Right line level outputs from Mix 2. 10. Direct Out: Line level outputs from Mix 2. If the Cabinet Simulator is switched in, these outputs are affected. 11.
6 3. Mixer ________________________________________________________ 3.1 Mix 1 General Mix 1 consists of four pairs of Left and Right inputs, two Passive Split outputs, and two pairs of MIX 1 outs. All of these jacks are for mono plugs, and are intended for line level signals. For mono signals, use only the Left input and the signal will feed into both the Left and Right channels.
7 The Mix 2 Outs carry the sum of all the Mix 2 inputs. This is the output to connect to your power amp, or to your amp's effect return jacks. If you need an output with the Cabinet Simulator, then use the Direct or the Balanced Outs instead. 3.3 Setting Levels [Note: This section assumes you have already connected your system together properly. You may want to come back to this section later if you are not ready to set levels now.] The System Mix Plus inputs are set to unity gain.
8 4. MIDI Volume Control ________________________________________________________ 4.1 Connections for the Volume Control To use the volume control, you must "patch" it into your signal path. There are no internal audio connections to or from the MIDI volume control. The volume control can be used for stereo volume, panning, or two separate mono volumes depending on your connections and the type of MIDI commands sent to it.
9 5. Recording & PA ________________________________________________________ 5.1 Cabinet Simulator The System Mix Plus Cabinet Simulator processes your line level signal to make it sound like it was amplified through a speaker cabinet and miked. This allows you to connect your guitar directly and still sound like a carefully miked, high quality cabinet. For Recording: Connect the System Mix Plus to your mixer or recorder for quick and easy direct recording.
10 • Phase Invert Button: Inverts the phase of the MONITOR IN signal. If the guitar signal in the mixer is out of phase with the one coming back in the MONITOR IN, you will notice some frequency cancellation. If the guitar signal in the headphone mix sounds "funny" or "hollow" try this switch. For Recording: Connect a stereo (TRS) cable from the headphone feed at the studio to the MONITOR IN jack. Now you can blend the incoming reference tracks (drums, bass etc.
11 6. Putting Your System Together ________________________________________________________ The System Mix Plus is a very flexible and versatile mixer. It can be used in many different ways. The following examples demonstrate some typical systems. Your needs may require different connections. These systems are simply meant to be starting points. Remember, all connections are intended for line level signals only, NOT speaker connections. 6.
12 In this example, the Mix 1 knob controls the level of the preamp, and the Mix 2 knob controls the level of the entire mix. Please refer to Section 3.3 to correctly set levels. System #2 This is a system that demonstrates a two stage effects system. This allows certain effects to affect other ones. Traditionally, the final effects are delays or reverbs that you want to affect the entire signal. 1. The guitar is connected to the amp or preamp input.
13 6. Additionally, you can connect the rear panel Direct Outs, or the front panel Balanced Outs to a mixing console or recorder. Be sure the Cabinet Simulator is on. In this example, the Mix 1 knob controls the level of the preamp and FX 1 and 2. The Mix 2 knob controls the level of the entire mix. Please refer to Section 3.3 to correctly set levels. 6.2 Using With a Switching System Switching systems, such as the Digital Music Corp.
14 3. The stereo outputs of the effects are brought back to the mixer to be blended with the original preamp tone using In 2 and In 3 of Mix 2. Mix 2 In 1 is being used by the internal connection with Mix 1 (the preamp). Next, the Mix 2 Outputs are connected to the power amp input, or the amp effect return. 4. Additionally, you can connect the rear panel Direct Outs or the front panel Balanced Outs to a mixing console or recorder. Be sure the Cabinet Simulator is on.
15 3. The stereo outputs of the effects are brought back to the mixer to be blended with the original preamp tone. For FX 1 and 2, we will use In 2 and In 3 of Mix 1. These effects will be blended in parallel with the original preamp tone. 4. Next, the two stereo Mix 1 Outs are used to drive four different GCX loops (Left and Right for two devices). The sends of the loops are connected to the appropriate inputs on FX 3 and 4, allowing them to be muted by the GCX.
16 Appendix A ________________________________________________________ Technical Specifications Mix 1 and Mix 2 Input Impedance Left and Right channels Left only, used as mono input Maximum Input Level Maximum Voltage Gain Output Drive 44kΩ 22kΩ 7 V RMS or +19dBu +6 dBu 7 V RMS across 5kΩ Direct Out Output Drive 7 V RMS across 5kΩ Balanced Outputs Output Drive 7 V RMS across 600Ω Headphones Headphone Impedance Output Drive 30Ω or greater 150 mW into 30Ω MIDI Volume Control Input Impedance Left an
17 Appendix B: Block Diagram ________________________________________________________ DIGITAL MUSIC CORPORATION
18 Warranty Information ______________________________________________________ Digital Music Corp. warrants this product against any defects that are due to faulty material or workmanship for a period of five years from the date of original retail purchase. This warranty does not include damage to the product resulting from accident or misuse, and is valid only to the original retail purchaser. If the product should become defective within the warranty period, Digital Music Corp.
