McIntosh MQ107

This is an equalizer used to optimize loudspeakers to a listening room.

It's made of chrome-plated steel. Its mirror-smooth surfaces make it difficult to photograph. It's chrome, and you'll see the rest of the room reflected in it.

It is intended to be adjusted using a warble-tone or band-limited pink-noise generator and analyzer to optimize loudspeaker installations.

It has variable LOW FREQUENCY COMPENSATION, which is bass boost peaking at 20 Hz, seven programmable bands of semi-parametric EQ, a HIGH FREQUENCY COMPENSATION (treble) control and gain trim for each channel.

A set of capacitors is included and required to program and operate the seven band equalizer. DO NOT BUY one of these without the capacitor kit, as without them you can't program or use any of the seven bands! Of course you could go out and supply your own capacitors.

The filters are programmed by plugging-in capacitors per this chart. NARROW is third-octave and WIDE is one octave: