Both the 3124+ and the 3124mb+ are designed with the professional engineer in mind, giving the highest possible quality 4 channel mic preamp and with the 3124mb+, an audio mixer with a transformer balanced output.that keeps the size and price at a reasonable level. Both models are equally at home in the control room, the studio, and news or recording truck, at the house console, on the stage, or at the artist's disposal for the source of his music.
The model 3124mb+ utilizes the same microphone preamp circuit that is used in all API consoles. It uses the RE-115 K mic input transformer and the same output transformer that is used in all API equalizers. All four mic inputs of the 3124mb+ are powered by an internal 48 volt phantom power supply, front panel switchable for each channel. Also provided is a front panel 20 dB pad switch that effects both the Mic and Line in.
The model 3124mb+ can provide up to 65 dB of gain to an output clip level of +30 dBm. The Hi-Z front panel input goes directly to the op-amp, allowing a low level input such as a guitar or bass to be amplified without a matching transformer or direct box. This Hi-Z input can accept input levels as high as +22, making it perfect for keyboards and other high level devices. The rear output is an XLR connector.
The model 3124mb+ is a 3124+ with the addition of a complete stereo mixer, plus a transformer balanced out. In conjunction with the gain control of the 3124+, the 3124mb+ adds a stereo panner with a level control, and a post "fader" aux send. The stereo panners and the aux sends are bussed to master output controls and then to the rear panel jacks. A stereo AUX return is provided to return effects or cascade additional mixers for more inputs. The unique aux return pot acts like a panner to balance the left/right signal, yet staying stereo. It can also be used as a mono return.
Uses API 2520 Op-Amp
Classic Console Circuit
Four XLR Mic Inputs
Four 1/4" Un-Balanced Inputs
Front Panel Polarity Switch
Front Panel 20 dB PadSwitch
Front Panel Mic/Line Switch
Front Panel 48V Power Switch
Output Clips at +30 dBm
|Input Impedance:||1500 Ohms Mic, 470 K Ohms Un-Balanced, HI-Z in|
|Output Impedance:||Less than 75 Ohms Channel Outputs|
|Nominal Levels:||XLR Channel Output +4 dBu|
|Stereo Output Level:||Unbalanced: nominal -2
|Clipping Level:||XLR Channel Output better than +28 dBm|
|Frequency Response:||+0, -5, 10 Hz to 20 kHz (-.5 at 10 Hz)|
|Noise EIN:||-129 Mic, -125 Un-Bal. Actual|
|Measured Noise:||Better than -91 dBm / below Nominal +4.|
|Distortion:||All Outputs at +4 out, .03%, at +22, .09% Max|
|Gain Range:||150 Ohms Input 10 dB Min., 65 dB Max (inc. PAD).
Un-Bal. Input 14 dB Min., 50 dB Max
|VU Meter:||Calibrated for XLR Outputs, OVU=+4 dBu,
(-12, -6, -3, 0, +3, +6, +18)
|Controls:||GAIN, PAD (20 dB), 48Volts, POL (polarity),
MIC (mic/un-bal), VU, AC
|Power Consumption, Quiescent:||19.2 Watts|
|Size:||19" X 1.75" (1U) X 10.5" Deep|
|Size (Boxed for Shipping):||23.25" X 6.5" X 16"|
|Actual Weight:||11.54 lbs.|
|Shipping Weight:||15.3 lbs.|