The VHD Pre Module for the popular 500 format modular rack platform makes the uniquely versatile VHD based preamp technology from Duality, SSL's industry-leading large format studio console, available for studios of all sizes.
The VHD Pre is an immensely versatile recording and processing device. It can deliver ultra-clean SSL SuperAnalogueTM grade recordings but also features a switchable VHD mode. SSL's patented Variable Harmonic Drive (VHD) system uses a 100% analogue signal path to generate rich harmonic distortion. As you increase VHD input gain, the Variable Harmonic Drive process introduces either 2nd or 3rd harmonic distortion or a blend of the two to your source material. At lower gain settings it adds gentle valve-style warmth or a touch of transistor edge. As the gain is increased the more extreme the distortion becomes until at high gain settings it delivers fierce trashy transistoresque grunge. The VHD Pre gives the user ultimate versatility from a studio grade preamp. Whether it's ultra-clean traditional SSL, subtle warming or totally trashy transistor distortion, VHD will change your expectations of what a preamplifier should deliver.
The VHD section of the VHD Pre Module has three rotary controls: a Drive control selects 2nd harmonic or 3rd harmonic distortion or a continuously variable blend of the two. A +20/+75dB gain control sets input level. A -20/+20dB trim control adjusts the output level from the circuit to enable level matching with other devices, because by its nature the VHD circuit can significantly increase signal levels. The VHD Pre Module has a selection of other essential professional preamp features: a signal present LED, a switchable 15Hz to 500Hz LF Filter section, Hi-Z impedance switch for mic impedance matching, +48V phantom power, PAD to enable the VHD system to be used as a line-level processing device and a Phase Invert Switch.
|VHD Input Module|
|Depth||200 mm (including front panel knobs, excluding connectors|
|-||275 mm (including front panel knobs and connectors)|
|Width||35 mm (front/rear panels)|
|-||49 mm (overall width (front and rear panels are offset))|
|Boxed Weight||460 g|
|HF (Low Pass)||20kHz – 3kHz (–3dB point) - 12dB/Octave|
|LF (High Pass)||15Hz – 350Hz (–3dB point) - 18dB/Octave|
|Microphone Amplifier Performance|
|Gain||Continously variable from +20dB to +70dB - Independently switchable 20dB Pad available|
|Input Impedance||Continously variable from ≅1k2Ω to ≅10kΩ|
|Output Headroom||> +26dBu at onset of clipping|
|THD + Noise||(-18dBu applied, +28dB gain) - < 0.2% (20Hz - 20kHz)|
|Frequency Response||20Hz to 20kHz - +0.3dB|
|-||50kHz - -3dB|
|-||150kHz - –3dB|
|Equivalent Input Noise||(input terminated with 150Ω) - < –126dB at maximum gain|
|Common Mode Rejection||(-10dBu applied, +30dB gain) - > 75dB from 50Hz to 1kHz|
|Line Input Performance|
|Gain||Continously variable from -24dB to +24dB|
|THD + Noise||(-24dBu applied, +0dB gain) - < 0.05% from 20Hz to 20kHz|
|Frequency Response||20Hz to 20kHz - +0.1dB from 20Hz to 20kHz|
|Equivalent Input Noise||(Input terminated with 150Ω) - -90dB|
RRP ex VAT: £1,599.00
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