McIntosh MQ-104

McIntosh MQ104 Equalizer

Replaced Filter Caps

Cleaned and tested

Input

2.5 volts.

27 kΩ.

Unity gain.

Output

2.5 volts into 27 kΩ or more.

Output source impedance: 600 Ω.

The output is coupled through small capacitors, so don't load this with 600 Ω or you will lose low-frequency response (see measurements).

Frequency Response

20 ~ 20,000 cycles.

Noise

Flat: 90 dB below 2.5V rated output (79 µV).

Worst case: 85 dB below 2.5 V rated output (141 µV).

Distortion

Harmonic and IM Distortion: < 0.1% from 20 ~ 20,000 cycles at rated output.

Equalization

Low Frequency Boost

Four levels of boost (numbered 2 through 5) optimized for early McIntosh speakers.

Flat setting: marked "1."

Maximum boost: 17 dB at 20 cycles.