Warm Audio WA-412 is a 4-channel microphone preamplifier and Instrument DI, housed in a 1U 19-inch rackmounting enclosure. Each channel has the usual complement of controls you’d expect of a professional preamp, including 48V phantom power, polarity inversion, a 20dB pad, and a high-impedance instrument input. Going slightly beyond what you might expect, each channel has a ‘tone’ switch, which changes the preamp’s input impedance, and there’s also an output trim knob, which allows you to drive the input stage in search of coloration form the transformer/op-amp, without overloading the next device in your recording chain.
4 Channel Microphone Preamplifier + Instrument DI.
Fully discrete, transformer coupled, through-hole component topology.
Altran USA custom wound, premium input and output transformers.
X520 discrete op-amp in every channel, socketed for convenience. Can be user-replaced with most 6 pin, discrete op-amps for varying flavor & tone.
65db of gain.
Inputs – Microphone XLR & Active Instrument 2Meg ohm HI-Z.
Outputs – Transformer balanced XLR & TRS.
-20db pad – pads both mic and instrument DI inputs.
TONE button input impedance – Switches from 600 ohms to 150 ohms (affects the tone of both the mic and HI-Z inputs).
Self noise: <-90dB (nominal).
Frequency response: 20hz to 20khz <+/-0.25dB (TONE button out), 20hz to 20khz +/-2dB (TONE button in).
+48 volt phantom power.
Output trim knob for precise level control and tone sculpting.
Internal power supply (grounded, 3 pin IEC cord).
Number of Channels: 4
4 x XLR inputs
4 x 1/4″ HI-Z instrument inputs
4 x XLR balanced outputs
4 x 1/4″ TRS balanced outputs
Phantom Power: Switchable for every channel
Gain Range: 65 dB
Input Impedance: Switchable between 600 and 150 Ohms
Rackmount Space: 1 RU