Based on Millennia's award winning HV-3 preamp circuit, the Millennia HV-37 is a pair of the critically acclaimed 500 series HV-35 preamp cards housed in a rugged 16 gage steel, single rack-space package with an on board universal power supply.
The panel front has an instrument input jack, DC coupled ribbon mic switch with 10dB gain boost setting, 80 Hz roll off filter, 48V phantom switch, 15 dB Pad, Polarity flip, signal present and overload LEDs and a continuously variable gain control.
The rear panel has XLR mic ins and XLR balanced line outs along with a standard IEC power connector. It can be powered directly by mains voltages between 100V and 240V.