API 3124MB+

4-channel Mic and Instrument Preamp with Stereo Mixer, Transformer Balanced Outputs, 65dB Gain Range and Front-panel hi-Z Inputs
API 3124MB+ image 1
API 3124MB+ image 1
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API 3124MB+
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Legendary Console Sound

The API 3124MB+ 4-channel microphone and instrument preamp packs API console sound and performance into a very easy-to-use, premium-quality rackmountable unit — complete with a built-in stereo mixer!. Whether you're capturing vocals or plugging in an instrument, you'll definitely appreciate the 3124MB+. It uses the same preamp circuit found in API consoles, plus the same output transformer you'll find in API's equalizers — a recipe for great API sound and character! This preamp provides a very robust gain range, making it useful for a variety of input sources. When you want premium API performance and sound plus a high degree of hands-on control, choose the 3124MB+.

API 3124MB+ 4-channel Mic/Instrument Preamp at a Glance:
  • Ideal for a variety of audio applications
  • Premium API components inside
  • Perfect for mics and instruments alike
  • Onboard stereo mixer and transformer balanced out

Ideal for a variety of audio applications
API's commitment to quality means the 3124MB+ provides a stellar front end to a wide variety of audio applications. The 3124MB+ is designed with the professional engineer in mind, giving you four channels of premium preamp performance, while keeping the size and price at a reasonable level. Equally at home in the control room, the recording studio, and news or recording truck, at the house console, on the stage, direct-to-DAT, or at the ready in your personal studio.

Premium API components inside
This preamp gives you the great sound and performance characteristics that make API gear so popular among studios, engineers, and musicians. How? 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.

Perfect for mics and instruments alike
You get plenty of headroom from this pre, whether you're plugging in a mic or an instrument. The model 3124MB+ can provide up to 65 dB of gain to an output clip level of +30dBm. 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, making it perfect for keyboards and other high level devices. The rear output is an XLR connector.

Onboard stereo mixer and transformer balanced out
Essentially a 3124+ with the addition of a complete stereo mixer plus a transformer balanced out, the 3124MB+ gives you even more flexibility and hands-on control. 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.

API 3124MB+ 4-channel Mic/Instrument Preamp Features:
  • Uses API 2520 Op-amp
  • Classic Console Circuit
  • Four XLR Mic Inputs
  • Four 1/4" Unbalanced Inputs
  • Front Panel Polarity Switch
  • Front Panel 20 dB PadSwitch
  • Front Panel Mic/Line Switch
  • Front Panel 48V Power Switch
  • Output Clips at +30dBm
  • Input Impedance: 1500 Ohms Mic, 470 K Ohms Unbalanced, hi-Z in
  • Output Impedance: Less than 75 Ohms Channel Outputs
  • Nominal Levels: XLR Channel Output +4 dBu
  • Stereo Output Level: Unbalanced: nominal -2, Balanced: +4
  • Clipping Level: XLR Channel Output better than +28dBm
  • Frequency Response: +0, -5, 10Hz to 20kHz (-.5 at 10 Hz)
  • Noise EIN:-129 Mic, -125 Un-Bal. Actual
  • Measured Noise:Better than -91dBm/below Nominal +4.
  • Distortion:All Outputs at +4 out, .03%, at +22, .09% Max
  • Gain Range:150 Ohms Input 10dB Min., 65dB Max (inc. PAD). Un-Bal. Input 14 dB Min., 50dB Max
  • VU Meter:Calibrated for XLR Outputs, OVU=+4 dBu, (-12, -6, -3, 0, +3, +6, +18)
  • Controls:GAIN, PAD (20dB), 48Volts, POL (polarity), MIC (mic/un-ba;), VU, AC
  • Dimensions:19" x 1U x 8"
  • Weight: 9 lbs.
The API 3124MB+ 4-channel preamp gives you legendary API performance and hands-on control!

Additional Media

Studio Preamp Buying Guide

Tech Specs

Preamp Type Solid State
Number of Channels 4
Frequency Response 10Hz-20kHz
Phantom Power Yes
Analog Inputs 4 x XLR, 4 x 1/4" (Hi-Z), 1 x 1/4" (Return)
Analog Outputs 4 x XLR, 2 x 1/4" (Stereo), 1 x 1/4" (Return)
Channel Inserts Yes
Rack Spaces 1U
Height 3.5"
Depth 8"
Width 19
Weight 9 lbs.
Manufacturer Part Number 3124MB+

Customer Reviews

Based on 2 reviews
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The Ad Blurb Says It...

Legendary Console Sound. I use a variety of preamps in my studio - mostly tube... but tubes put too much hair on electric guitars for me, so I wanted something more straightforward and with more than two channels. The output is strong enough that depending upon your system, you may need some line attenuators - but the sound of this preamp is absolutely gorgeous. I now use it on just about everything but vocals and overhead drum mics (prefer tube still). I've not worked with anything that I thought was comparable. Clean, rich, flexible, easy - done! FWIW, we're getting ready to buy another to add to the racks.
Music background: Musician/Songwriter/Engineer

Very cool...Awesome even!

I mean, this product is EXACTLY what you expect, and its just what a professional musician needs to record and then polish their own tracks. If you can't afford to get a 2500 compressor as a companion, however, I would stay clear of this product and try out the API "lunchbox" full of your favorite API and Chandler goodies! If you can afford a full rack of all API gear, but not an API console, then green light this buy (and start saving for a pair of 2500's and a pair of 550's)...this is FOR YOU! Also API pres just LOVE high end dynamic mics (Heil, E/V, Sennheiser), get 'em DIRTY (the Christina Aguilera kind of "dirty" lol, the good kind) with API! Sexy, yeah baby! I've played with this extensively, and on a few occasions I was actually allowed to touch them lol. I have been putting it aside for this for a while, and I can't wait to own it, but I don't do a lot of recording these days, so first things first...I need some real bad-azz monitors and an D/A upgrade.
Music background: 15 Years experience home recording, visiting studios, and helping bands find their sound!
See also: API, API Preamps