"Whether you need to track pristine vocals, crunched drums or electric guitars on the edge of sonic destruction, the VHD Pre delivers a powerful and versatile sound shaping tool kit - the perfect analogue companion to your digital recording system.Based on the VHD circuit from our acclaimed Duality console, the VHD Pre adds four SSL mic preamps to any line level DAW audio interface, transforming it into a professional quality, multi-channel analogue recording system.The four ultra-clean, high-grade mic preamps are combined with independent Variable Harmonic Drive circuits that use 100% analogue signal paths to generate rich harmonic distortion - adding SSL analogue attitude to your digital recordings.As you increase the input gain, the Variable Harmonic Drive circuit introduces a blendable mix of 2nd or 3rd harmonic distortion to your source material, taking it from gentle valve-style warmth through to trashy transistoresque grunge. It

Physical
Depth 230mm / 9" casing only
Height 44.5mm / 1.75" (1 RU)
Width 438mm / 17.25" casing only
482mm / 19" inc' rack ears
Weight 2.6kg / 6 pounds
Power Boxed size 320mm x 550mm x 80mm
12.75" x 21.75" x 3.25"
Boxed weight 3.5kg / 8 pounds

* All values are approximate

Environmental
Temperature Operating: +5 to 30 deg. C
Non-operating: -20 to 50 deg. C
Max. gradient: 15 deg. C/hour
Relative Operating: 20 to 80 %
Humidity Non-operating: 5 to 90 %
Max. wet bulb: 29 deg. C (non-condensing)
Vibration Operating: Non-operating, power off: Shock Operating: Non-operating: Altitude Operating: 0 to 3000m (above sea level)
Non-operating: 0 to 12000m

Connections
Power Supply IEC320 3-pin connector, 100 - 240 Vac, 50 - 60 Hz
Analogue I/O
Microphone Balanced, 3-pin XLR-F, Zin = 1kO (10kO for Hi Z)
Instrument Un-balanced, ¼" Mono Jack, Zin = 1MO
Output Balanced, 3-pin XLR-M, Zo = 40O
Power 5-pin 180° DIN connector, +5Vdc, ±15Vdc

Ultra-clean SSL preamp with 75dB of gain

48V phantom power

20dB Pad switches that illuminate to indicate overload

Hi Z switches to accommodate mic, line and instrument level signals

Four independent Variable Harmonic Drive systems

Front panel 1/4" jack instrument/line level inputs with passive DI type impedance detection and level matching

Individual input, output and VHD controls for each section

Rear panel XLR mic/line inputs and XLR outputs