The vertical Rupert Neve Designs 5012 Duo Mic Preamplifier is a dual-channel microphone pre-amplifier built with Rupert Neve's custom input and output transformer circuits. The pre-amplifier is electronically balanced and designed to minimize the effects of hum, radio interference, and other dissonant noise from altering your sound. The vertical version of this module is a half-rack unit intended to be mounted in a small vertical rack or a bracket or tray that is itself mounted in a conventional 19" horizontal rack.

The microphone inputs use a transformer-like-amplifier chip and a toroidal Common Mode Rejection low-pass filter to reject frequencies above 150,000 Hz. This prevents odd high-frequency harmonics from altering the sound quality of your recording signal chain. After the high-frequency rejection stage, the pre-amp uses an input transformer that provides +25 dBu of input signal at unity gain without the need for a pad. The combination of an electronically balanced circuit with a true transformer amplifier stage allows the device to retain the Rupert Neve's sound in a small form factor.

The back panel of the device features an XLR input for channels A and B, an XLR output for each channel, and 4 x 1/4" TRS connectors for connecting Portico bussing modules to the signal chain.
 
The Features
Silk
- The Silk knob on the front panel of the pre-amplifier reduces negative feedback and adjusts the frequency response of the signal to make the sound smoother and more pleasing
 
Level Meter
- Each channel in the pre-amplifier features an output-reference level meter ranging from -30 to 22 dBu
 
Mute
- The Mute button cuts the output signal post metering and pre-buss output in the signal chain
 
High-Pass Filter
- The pre-amp includes a High-Pass Filter that allows you to attenuate signals between 20 and 250 Hz. This is useful for removing motor hum, air, handling noise, and building rumble from the signal chain
 
Phantom Power
- The pre-amp can provide 48V of phantom power to each channel
 
Buss Output
- For connecting the pre-amp to other Portico Buss Amp/Monitoring modules, the pre-amp includes an unbalanced high-impedance Buss output. A TRS patch cord is used to connect the pre-amp to the other Portico unit
 
Phase Button
- The pre-amplifier includes a Phase button that inverts the output polarity 180 degrees