Buzzaudio QSP-20 4-channel mic preamp


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Buzzaudio QSP-20  Four Channel Class A Discrete Mic / Instrument Preamp with Lundahl Outputs

The QSP-20 audio path uses our low noise BE41 class A discrete amplifier design in a balanced configuration at the input feeding a Lundahl audio c-core transformer at the output. Instead of the traditional input transformer we use hi-spec Wima coupling capacitors. The topology is quite different to most other mic preamps in that it is balanced from input to output. The DI inputs feature our BE43 “bootstrapped FET” input interface for a very full sound from your pick ups.

The QSP-20 provides up to 70dB of effortless gain for all situations and the transformer-less input matches all microphone types nicely.  Perfect for your dynamic and ribbon microphones which require additional gain.

The very wide frequency response (even at high gain) ensures transients and high frequency content are preserved which make the QSP an excellent choice for percussion and acoustic insturments. But it never sounds “brittle”, the output transformer adds that nice touch of warmth to complete the sonic picture. The very high output headroom of 29dBu means it is unlikely you will ever clip the QSP-20 before your DAW audio interface does!.



GAIN – 41 detented pot that sets gain between 22 to 70dB.
0dB/-20dB – this switch introduces a 20dB pad right at the mic input for high level signals.
0/MUTE/180 – this switch changes the polarity (phase) of the output and in the center postion, it mutes the output.
HI Z/LO Z – selects the input impedance as seen by the microphone which can change the overall tone.
48V – locking toggle switch turns the phantom power on and off.
PK – this red led will light up when the QSP output level reaches 22dBu.
There is also a handy power ON/OFF switch.


Additional information

Weight 15 kg