Preamp circuit is switchable between two amps: RED and GREEN.

RED mode is a British classic style preamp (1073) and GREEN is an American vintage style preamp (discrete opamp). Both preamps have unique sonic textures known as a best classical sound preamps.
Carnhill transformers are responsible for matching impedance and de/symmetrization circuits. Preamp is loaded with two PADs: IN 20dB PAD and OUT 8dB PAD which allows to saturate both preamp and output transformer.

Additionally DUE-PRE has front input XLR Combo socket which can be used in both ways: as a mic input and as a instrumental input. Instrumental input is a high impedance input of which signal feeds input transformer through FET transistor. Module can draw up to 5W of power.

High quality Grayhill gain switch

64dB of gain (preamps are matched with 0.5dB accuracy)

Canrhill in/out transformers

20dB input PAD

8dB output PAD (allowing saturation of both preamp and transformer)

Polarity Reverse switch

+48V phantom power

Fornt autosense XLR mic

Hiz Fet DI front input (the signal passes through the input transformer)

LED VU meter

Input impedance: 1200ohm

Output impedance: 600ohm

Max. output level: RED (+27dBu); GREEN (+23dBu)

min THD ratio: 0.005%

Total gain: 64dB

Power: up to 5W