API 3124+

4-channel Mic and Instrument Preamp with 65dB Gain Range and Front-panel hi-Z Inputs
API 3124+ image 1
API 3124+ image 1
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API 3124+
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API Console Preamp Performance in a Rackmountable Unit!

The API 3124+ 4-channel microphone and instrument preamp packs API console sound and performance into a very easy-to-use, premium-quality rackmountable unit. Whether you're capturing vocals or plugging in an instrument, you'll definitely appreciate the 3124+. 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. Equally at home onstage, in the broadcast rig, and in the recording studio, the 3124+ is a real performer.

API 3124+ 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
Ideal for a variety of audio applications

API's commitment to quality means the 3124+ provides a stellar front end to a wide variety of audio applications. The 3124+ 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, 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 3124+ 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 3124+ are powered by a 48 volt phantom power supply, front panel switchable for each channel. Also provided is a front panel 20dB pad switch that affects both the Mic and hi-Z inputs.

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 3124+ can provide up to 65dB 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 +20 dBu, making it perfect for keyboards and other high level devices. The rear output is an XLR connector.

API 3124+ 4-channel Mic/Instrument Preamp Features:
  • Uses API 2520 Op-amp
  • Classic Console Circuit
  • Four XLR Mic Inputs
  • Four front panel 1/4" hi-Z instrument Inputs
  • Front Panel Polarity Switches
  • Front Panel 20dB PadSwitches
  • Front Panel Mic/Line Switches
  • Front Panel 48V Power Switches
  • Output Clips at +28 dBu
  • 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 +4dBu
  • Stereo Output Level:Unbalanced: nominal -2, Balanced: +4
  • Clipping Level:XLR Channel Output better than +28dBm
  • Frequency Response:+0, -0.5, 10Hz to 20kHz (-0.5 at 10Hz)
  • 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 14dB 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-bal), VU, AC
  • Dimensions:19" x 1U x 11"
  • Weight: 11 lbs.
The API 3124+ 4-channel preamp gives you legendary API sound and performance!

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)
Analog Outputs 4 x XLR
Rack Spaces 1U
Height 3.5"
Depth 8"
Width 19
Weight 11 lbs.
Manufacturer Part Number 3124+

Customer Reviews

Based on 12 reviews
Write your review

Preamp Heaven

Really, it just doesn't get much better than API. Drums, guitars, horns... there is nothing that doesn't benifit from the API sound. Don't be afraid to push the gain on this thing, that saturated transformer sound is just lovely. This is the second one I have bought and neither will ever be out of the rack.
Music background: recording and live sound engineer. Studio owner.

Amazing Pre Amp!

Running some Neumann 184's and other good mics through the 3124+ is like magic. It just gives everything a punchy powerful tone. Obviously that won't work on everything but for the other 99% of stuff you do, it will!
Music background: Drummer, recording engineer, Producer

Awesome Classic Preamp

The API 3124 is a workhorse in our studio, the sound is BIG, the tone is BIG, the output level can be very BIG (greater than +30dBv) and it's got an important feature that many other high-end preamps don't have, the LED output level meter on the front! That output level meter is a critical feature, you need to know how much level you're sending out. Look at how many $500+ per channel mic preamps DON'T have output level metering, it's surprising to me, I depend on the output level meter and it's a key factor in me choosing these preamps. My API preamps have been absolutely reliable, the internal power supply is nice and quiet and the overall package feels like it is built like a tank. Each preamp features transformer-coupled input and output using parts that are equal or better than the vintage parts of long ago. I have original API 312 preamps with original New York op amps and transformers, they're in high end rack chassis and have a remote power supply, they don't sound any better than the 3124 IMHO, different maybe but not better, I think API is building some of the best equipment the company has ever made. If quality tone matters to you then you can't go wrong with API.
Music background: electrical engineer, singer, guitar player

API 3124+ Provides That "Professional Sound"

This gear is not a consumer or "pro-sumer" piece. It is the real deal. These preamps are worth every penny and help you get the most out of your signal. At this level of the game, you can only find something with a different character. You really can't get higher quality. The only way to find out if API is better for you compared to another piece of gear at the same price range is to actually try it for yourself.


I have never had a single issue with my APIs. They are durable and reliable. Countless sessions, countless basement studio relocations, and recording a vast array of instruments. They sound great on everything. I will never regret this purchase.
Music background: Audio Engineering

Sweetwater Advice

Thomas Leahy

I typically use the API 3124+ for close miking drums, where the response and mid-high bump bring out the best in toms, kicks, and snares. It's articulate character also produces excellent results when I track the kind of rhythmic vocals you find in pop and hiphop. As a DI, it's upfront and articulate, and the 3124+ delivers the classic API sound on any source.
See also: API, API Preamps