Two channels. One slot. Zero compromise.
The KOËL Twin Pre redefines what a 500-series preamp can be.
By squeezing two FULLY DISCRETE API-style 312 preamp circuits into a single 500-series slot, Twin Pre instantly doubles the input count of your rack — without doubling the cost or space.
Load an 8-slot lunchbox with Koël Twin Pres and suddenly you’re tracking 16 channels of discrete preamps — perfect for drums, live tracking, hybrid studios, and mobile rigs.
How it works
Channel 1 uses the rear in & out on your 500 rack, Channel 2 uses the XLR in & out on the front panel.
This Doubles your available inputs without expanding your rack at a lower cost per channel than competing 312-style clones!
Classic 312 Tone
At the centre of the design is our 2520 Discrete Opamp, built from the original circuit with matched, low noise NOS transistors.
All capactiors are the highest quality, low ESR from Wima, Nichicon and Panasonic
Each channel features its own fully discrete gain stage, carefully matched components, and transformer-balanced input and output. The result is a preamp that stays tight and punchy on drums, open and detailed on guitars, and authoritative on vocals — exactly what engineers expect from a 312-style circuit.
TECH SPECS
- 2 independent mic preamp channels per slot
- Discrete API 312-style design
- 2520 Discrete Opamp for each channel
- Custom permalloy low distortion Input Transformer
- OEP High Performance Output transformer
- Fully analog signal path
- Mic Gain 60 dB per channel
- Independent gain and output control per channel
- Phantom Power switch with LED indicator
- Phase reverse per channel
- -20db Pad per channel
- Frequency Response 20 Hz – 20 kHz (±0.5 dB)
- +28 dBu Output Level