McIntosh MQ-107 Vintage Environmental Equalizer w/Official Capacitor Kit

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General:

First ever MQ-107 into the shop.

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

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. 

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

Simply remove the cover to adjust. A set of capacitors is included in the original McIntosh packaging which are required to program and operate the seven band equalizer.

SkyFi Cosmetic Note:
• Chrome surfaces show signs of pitting from age
• Silkscreen lettering wear in certain areas from age

Current Configuration:
All Narrow Filters:
1 - 20Hz
2 - 40 Hz
3 - 80 Hz
4 - 100 Hz
5 - 250 Hz
6 - 500 Hz
7 - 1000 Hz

*We are happy to re-configure this to you prior to shipping. Probably best to call us to chat to confirm specs requested.

Brand Background:

McIntosh Laboratory is an American manufacturer of handcrafted high-end audio equipment based in Binghamton, New York. The company was founded in 1949 by Frank McIntosh. The company designs and produces audio amplifiers, stereo tuners and other consumer electronics products. 

McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment experience for discriminating listeners around the world. Our iconic blue Watt output meter is globally recognized as a symbol of quality home audio. With a McIntosh home stereo system or home theater, listeners have the ability to create their own luxury audio experience – and truly live their music.

Ownership:

Second Owner 

Connections:

RCA inputs and outputs

General Sound:

Neutral sound with little to no coloration 

Cosmetic Condition:

6 - Moderate Signs of Wear

https://skyfiaudio.com/pages/our-rating-scale

Working Condition:

Working perfectly and tested in our lab.

Included:

The MQ-107, Official McIntosh Capacitor Kit, and captive power cord.

Packing:

Will be packed using our highly developed in-house process and custom packing materials.

Original MSRP:

$699.00

Dimensions:

3-1/2” high, 5-3/4” wide and 14” long

Weight:

7 lbs

Age:

1990

Reviews:

https://www.kenrockwell.com/audio/mcintosh/mq-107.htm

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best 

Specs:

Frequency Response: 20Hz to 20,000Hz +/- 0.5dB

Hum and Noise: 90dB (79uV) below 2.5V flat response. 85dB (140uV) below 2.5V worst case.

Harmonic and Intermodulation Distortion: less than 0.02% at 2.5V output 20Hz to 20,000Hz

Low frequency Compensation: Variable from 0 to +17dB at 20Hz

Input Sensitivity: 2.5V into 27k ohms for rated output with controls set for flat response

High Frequency Compensation: Variable +/-10dB at 20,000Hz

Output Level and Impedance: 2.5V into 10k ohms or more with the output level at zero and all other controls set for flat response.

Programmable Filters: 14 sections (7 per channel) each of which can be programmed for standard 1/3 octave center frequencies from 20Hz to 1000Hz. Filter bandwidth is programmable for narrow (approx. 1/3 octave) or wide (approx. 1 octave). Amplitude is continuously adjustable +/- 12dB for narrow and +/-15 dB for wide. A detented control is used to position for flat response. Programming is achieved by means of plug-in capacitors provided with the MQ107.

Gain
±0.000 dB, EQ OUT (direct passive bypass).
Left: -5.735 dB ~ +3.518 dB.
Right: -5.710 dB ~ +3.497 dB.
Unity gain is at about 1:20 o'clock on the gain controls, not at the marked zeros.
Loaded with 600Ω it's -8.025 dB less than when loaded with 200k Ω as above.
Loaded with 300Ω it's -12.125 dB less than when loaded with 200k Ω as above.
 
Maximum Output Level     
5.68V @ 0.1% THD no boost or cut.
MOL 5.4V at insane levels of boost.
Max input level about 5.0V with lots of cut.