Avalon

The VT-747SP combines a stereo tube-discrete Class A spectral-opto-compressor, with a six band program equalizer. With left/right output level and gain reduction metering, and internal regulated power supplies, the unit is ideal for high performance DAW input signal conditioning (like stereo keyboards), stereo buss compression/EQ and analog mastering applications.
The opto-compressor features a minimum signal path design, utilizing sealed silver relays for all signal routing and by-pass functions. The optical attenuator of the VT-747SP acts as a passive level controller, with a Class A, variable gain make-up amplifier. Full dynamic control, from soft compression to hard-knee limiting can be achieved with master threshold, ratio-compression, attack and release controls. Gain reduction is displayed on the large analog VU meter, while low frequency and high frequency parametric spectral controls with variable frequency and threshold levels, can be routed into the side-chain path for enhanced frequency dependent compression. SC listen provides side-chain listening mode for monitoring.
The VT-747SP equalizer utilizes 100% discrete, Class A high-voltage transistors for optimum sonic performance. The six band stereo program EQ incorporates the smooth characteristics of an all-passive design. The EQ can be placed pre or post the opto-compressor for enhanced effects. The unit also features TSP (Twin Signal Path) which gives the user the choice of either tube tone, or the classic, Class A discrete transistor sound by exchanging, three high-voltage dual triode tubes with discrete amplifiers in the opto-compressor and primary output stages.
Stereo Class A opto-compressor with spectral control
Stereo Class A six band discrete passive program EQ
TSP
Twin signal path, with vacuum tube bypass
EQ pre-post selection for opto-compressor
Variable threshold, ratio, attack & release
All signal routing with sealed silver relays
Large accurate professional analog VU meter
Fully balanced Class A input and DC coupled outputs
Military spec vacuum tubes for long life and low noise

Function Stereo compressor with twin signal path (TSP)
Number of Channels 2
Inputs 2 x XLR
Output 2 x XLR
Maximum Input Level +36dBu
Compression Threshold -30dB to +20dB, variable
Compression Ratio 1:1 to 20:1, variable
Attack Time 2mS to 200mS, variable
Release Time 100mS to 5 seconds, variable
Gate Threshold Not applicable
Gate Rate Not applicable
Maximum Output Level +30dB
Make-up Gain 0dB to +10dB stereo tracking, variable
Frequency Response 1Hz to 200kHz (input band limited)
Dynamic Range Not specified by manufacturer
Noise -92dB
Dimensions 2U rack mount, 12" deep
Specialties Six band discrete Class A, passive design EQ optimized for full range program material