Focusrite VoiceMaster Pro - Vintage Harmonics Specifications; Optical Compressor Specifications

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VINTAGE HARMONICS
• Threshold range = -10 dBfs (+12 dBu) to –40
dBfs (-18 dBu).
• Compression ratio (Depth switch out) = 1:1.5
• Compression ratio (Depth switch in) = 1:3
• Mid band centre frequency = 3.5 kHz.
• High band centre frequency = 20 kHz.
• Band Q = 0.2
• 6 LED meters show the amount of boost at the
centre frequency of the band, meter calibrated in
dB increments.
OPTICAL COMPRESSOR
• Threshold hold range = -15 dBfs (7 dBu) to –40
dBfs (-18 dBu).
• Compressor ratio (Hard Ratio switch out) = 2.5:1
• Compressor ratio (Hard Ratio switch in) = 6:1
• Attack time (Slow Attack switch out) = 0.5 ms.
• Attack time (Slow Attack switch in) = 5 ms.
• Release time = 100 ms to 1 s and then auto
release mode when the release knob is turned fully
clockwise. Auto release creates a release time
dependent upon the average level of the incoming
signal.
• Noise = -94 dBu measured with a 20 Hz/22 kHz
bandpass filter.
• Makeup gain = 0 to +18 dB.
Ratio:
Threshold range:
TUBE SOUND
• Harmonic generation = 2nd, 3rd and 5th
harmonics generated from fundamental frequency
of the incoming signal relative to position of the
Drive knob.
• THD with Drive knob at cool = 0.6% with a –10
dBfs (+12 dBu) 1 kHz input signal measured with
a 20 Hz/22 kHz bandpass filter.
• THD with Drive knob at warm = 6% with a –10
dBfs (+12 dBu) 1 kHz input signal measured with
a 20 Hz/22 kHz bandpass filter.
• The effect can be monitored visually using the
drive led as follows: -
Drive LED colour Harmonic effect
Blue to Green Mostly 2nd with some 3rd.
Yellow to Orange More 3rd and 5th .
Orange to Red Large amounts of all harmonics
above fundamental frequency.