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VC3Q
- User's guide
Pro Channel
TECHNICAL PERFORMANCE
THE INPUT STAGE
The 'front end' is an entirely new design using 5 complete stages of
amplification controlled by a single volume control. The design gives
(microphone) input headroom of more than 30dB; the input is floating
balanced and will easily accept microphone levels from -70dB up to more
than 0dB. Phantom power is provided for capacitor microphones.
- Noise performance is up to finest laboratory standards
(125.5dB below input 20Hz to 20KHz 200ohm input termination)
- The line input is designed for unbalanced circuits and will accept -30dB up
to +24dB.
The nominal operating level at the 'insert' point is -10dB. but as maximum
output at that point is +24dB the PROCHANNEL can operate with any mixer
or outboard equipment.
THE OUTPUT STAGE
An LED 'meter' shows levels immediately before the output stage. An
output volume control gives the choice of output volume levels. The two
output jack sockets are identical. Output is balanced 75 ohm with
maximum output +26dB. Noise is approx. -80dB.
THE COMPRESSOR
The built-in JOEMEEK compressor is slightly different from the big studio
units like the JOEMEEK SC2.2 or SC4, so that it is easier to operate with
musical instruments. The 'ATTACK' control is variable so that the impact of
the compression sound can be varied from a gentle effect (with the attack
adjusted fast) to more powerful sounds with longer attack times.
The compression release is variable from 125mS up to 1.5 seconds giving
a wide range of effects. An in/out switch allows comparison between
compressed and uncompressed sound.
Technically, the compressor is a feedback optical device where the
compression is provided by a light dependent resistor. The light source
works in a servo loop, the compression effect is carefully controlled and the
compression ratio varies with the amount of compression applied.
During slight compression, the ratio can be as low as 1.2:1. During heavy
compression, the ratio rises to about 7 to 1 although a feature of the
JOEMEEK compressor is that the ratio momentarily decreases during
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