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The challenge for the
modern studio (large or small) is a big sound on a tight budget, so we've
done our best to bring you a very high level of audio performance at reasonable
price. The QSP 4 channel mic preamp is made with real Class A discrete
amplification and high end audio transformers just like the vintage classics
of the past. But it does not carry the vintage price tag. The QSP has
a stunning sound which you will immediately notice and owning a unit means
never having to doubt your preamplifier again.
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here for larger image
Like most of our microphone preamplifiers, the QSP-20 does not use a transformer
at the input. Instead we couple direct to the Class A (BE41) amplifier
modules with hi-quality WIMA capacitors. This approach presents a much
less reactive load to the microphone and allows it breathe better. In
other words, the QSP is like an extension to the microphone and this means
you can clearly hear the differences between all microphone types and
brands. The HI Z - LO Z switch allows you change the load the microphone
sees, and this can produce subtle tonal changes depending on the type
of microphone.
Another advantage of the direct coupled input is noise - or lack of it.
You will discover the QSP has an extremely low noise floor making it useful
for low output microphones such as ribbons. The low noise plus the high
output headroom results in a preamp with 92dB dynamic range at full gain
of 70dB.
In addition to the four mic inputs, you also have four high impedance
instrument inputs on the front panel. These inputs can be used for keyboards
and instruments with unbalanced pickups.
Both the mic and line inputs benefit from the sound of the Lundahl* output
transformer which exhibits an incredible frequency response right out
to 200kHz, whilst adding a subtle amount of harmonic at the lower frequencies.
Transients are preserved and the bottom end sounds full and these attributes
make the QSP an excellent preamplifier for recording drums and other percussive
instruments.
Min Gain Mic = +22dB (-2dB with pad in)
Max Gain Mic = +70dB
Min Gain Instrument = +12dB (-3dB with pad in)
Max Gain Instrument = +60dB
Maximum Output Level = +29dBu into 3k ohm load.
Frequency Response
Mic = 10Hz to 200kHz @ 20dB gain (-3dB).
Instrument = 10Hz to 120kHz @ 20dB gain (-3dB).
Total Harmonic Distortion
(measured at -20dBu input, gain adjusted for +10dBu output level)
Mic = 0.15% @ 100Hz, 0.01% @ 1kHz, 0.005% @ 10kHz
Instrument = 0.15% @ 100Hz, 0.015% @ 1kHz, 0.015% @10kHz
Noise
EIN Mic = -131dB A wtg, 150ohm source Z.
Signal to Noise Ratio Instrument = -76dB A wtg, input shorted.
CMNR Mic = -78dB @ 100Hz,
-100dB @ 1kHz, -100dB @ 10kHz.
Input Impedance Mic = 4k ohms/1k2 ohms switchable.
Input Impedance Instrument = 1MEG ohms.
Power
115V or 230V ac mains, switchable on rear panel.
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Modern
music recording 