Mic Pre QPP



User's Manual

Our mic pre is the most important part of your signal chain. Each QPP features four all-discrete, all-iron mic pres with a simple and powerful amplifier. We offer a variety of input transformers, output transformers, op amps and even voltages to give you the sound you need. Whether you're looking for quiet and clear, warm and smooth, or edgy and rock and roll, this preamp can do what you need.


The input transformer can feeds a discrete operational amplifier for up to 64 dB of gain, followed by a custom-wound Cinemag Output transformer with a infinitely variable T-pad attenuator. A dB pad, phase, mute, and 48V phantom power round out the preamp.

Block Diagram

Technical Specifications

Gain Range                                          28 - 64 dB (8-44 dB with PAD)

Maximum Input Level                         -3.5 dBu

Maximum Output Level                      +26 dBu 

Input Impedance                                 2300 Ohms

Output Impedance                             <75 Ohms, transformer balanced

Frequency Response                        +0.1, -0.75 dB 20Hz-20kHz

Actual Measured Noise                     -96.4 dBA

THD @ +15 dBu output                     0.002% typical

Crosstalk (any channel)                     Better than -90 dB

Power Consumption                          100 mA max

If you are interested in owning one, please contact us at: contact@ironageaudioworks.com

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