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Summarizes key features and provides an introduction to the 3124mb+ unit.
Illustrates the signal path through the 3124mb+ unit.
Details routing signals via insert points and auxiliary send/return connections.
Visual representation of the preamplifier channel signal flow.
Visual representation of the stereo mixer section signal flow.
General description and key features of the preamplifier section.
Detailed explanation of the controls for the preamplifier section.
Explanation of how to select between MIC and INSTRUMENT inputs.
Function and operation of the polarity inversion switch.
How to monitor preamplifier output levels using the VU meter.
Details on the preamplifier's direct output connections.
Visual representation of the preamplifier channel signal flow.
General description and key features of the stereo mixer section.
Detailed explanation of controls like Masters, Aux Level, and Ret Pan.
Visual representation of the stereo mixer section signal flow.
Details on front and rear panel input connectors and their functions.
Details on rear panel output connectors and their functions.
Impedance and Levels| input impedance (mic) | 1500 Ω |
|---|---|
| input impedance (unbalanced) | 470 kΩ |
| output impedance | Less than 75 Ω |
| nominal levels (XLR channel output) | +4 dBu |
| stereo output level (balanced) | +4 |
| stereo output level (unbalanced nominal) | ‐2 |
Audio Performance| clipping level (XLR channel output) | better than +28 dBm |
|---|---|
| frequency response | +0, ‐5, 10 Hz to 20 kHz (‐0.5 at 10 Hz) |
| noise EIN (mic) | ‐129 |
| measured noise | Better than ‐91 dBm/Below Nominal +4 |
| distortion at +4 out | 0.03% |
| distortion at +22 out | 0.09% |
Gain and Metering| gain range (150 Ω input) | 10 dB Min, 65 dB Max (Incl. PAD) |
|---|---|
| gain range (unbalanced input) | 14 dB Min, 50 dB Max |
| VU meter calibration (XLR outputs) | OVU = +4 dBu (‐12, ‐6, ‐3, 0, +3, +6, +18) |
Power and Dimensions| power consumption (quiescent) | 19.2 Watts |
|---|---|
| size | 19” × 1.75” (1U) × 10.5” Deep |
| size (boxed for shipping) | 23.25” × 6.5” × 16” |
| actual weight | 11.54 lbs. |
| shipping weight | 15.3 lbs. |
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