3124+
3124mb+
3124+ / 3124mb+ Mixer
Features
Uses API 2520 Op Amp
Classic Console Circuit
Four XLR Mic Inputs
Four 1/4” Un-Balanced Inputs
Front Panel Polarity Switch
Front Panel 20dB PadSwitch
Front Panel Mic / Line Switch
Front Panel 48V Power Switch
Output Clips at +30 dBm
Both the 3124+ and the 3124mb+ are designed with
the professional engineer in mind, giving the high-
est possible quality 4 channel Mic Preamp and
with the 3124mb+, an audio mixer, while keeping
the size and price at a reasonable level. Several
3124mb+ mixers can be linked to increase the num-
ber of bussed channels. Both models are equally
at home in the control room, the studio, a news or
recording truck, at the house console, on the stage,
direct-to-DAT, or at the artist’s disposal for the
source of his music.
The model 3124+ utilizes the same microphone preamp circuit
that is used in all API consoles. It uses the RE-115K mic input
transformer and the same output transformer that is used in all
API equalizers. All four mic inputs of the 3124+ and the 3124mb+
are powered by an internal 48 volt phantom power supply, front
panel switchable for each channel. Also provided is a front
panel 20dB pad switch that effects both the Mic and Line in.
The model 3124+ 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 take input levels as high as +22, mak-
ing 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. 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 cas-
cade additional mixers for more inputs. The unique aux return
pot acts like a panner to balance the left/right signal, yet stay-
ing stereo. It can also be used as a mono return. A standard
3124+ can be further expanded to an “mb” at the factory. Sev-
eral options for the “mb” include a discrete unbalanced stereo
output or a discrete balanced stereo output.
8301 Patuxent Range Rd. Jessup, MD 20794 Phone (301) 776-7879 Fax (301) 776-8117 sales@apiaudio.com
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