McIntosh MQ 104 Vintage Environmental Equalizer; MQ104 for ML / XR Speakers

Product: McIntosh MQ 104 Vintage Environmental Equalizer; MQ104 for ML / XR Speakers

Product SKU: 15999

Serial Number: AM2462

Voltage: 120V

Cosmetic Description: 8/10 Excellent condition with minimal visible cosmetic wear including some light scratching in the chrome. This item shows some wear consistent with its age but is still presentable and sounds wonderful.

What is Included: Equalizer with Original Capacitor Kit, RCA cables, Manual, Service Manual, and Factory packaging

Functional Notes: Operational condition of this item is excellent, fully tested and no issues found.

Age: Circa 1980

# of Owners: 1

Tobacco Exposure: No

Service History: None

MSRP: $500

Other Notes: "The MQ104 Custom Environmental Equalizer provides the same basic low frequency compensation controls as the MQ101 and MQ102. The individual controls can be seen at the left portion of the MQ104. These 5 positions not only provide correct compensation for the overdamped woofer but also correct for the solid angle where the woofer radiates into the room. The response at the speaker is then flat right down to 20Hz. This compensation is required for all of the ML systems plus the XR3, XR5, XR6, XR7 and XR14 systems. However, this compensation does not correct for room resonances.

The MQ104 goes a step further. It has four adjustable filters in each channel. These filters can be tuned to greatly reduce the effect of room resonances from 20Hz up to 1kHz. The response can be adjusted to have lower output at frequencies where there is a corresponding acoustic peak and increased output at frequencies where there is a dip. The resulting acoustic response at the listening position is then smoothed out. Low frequency compensation can be used along with the filters to achieve this.

The filters are programmable to be 1/3 octave or 1 octave wide. They and can each boost or cut 12dB in the narrow mode or 15dB in the wide mode. The picture at the right shows the top cover removed. The center frequencies and filter width can be programmed by plugging in two capacitors for each filter."

Product Specifications

Reviews:  Ken Rockewell

Shipping: Cost to ship this item within the contiguous United States is a flat rate of $27- including packaging and insurance. For all other locations including Hawaii, Puerto Rico and Alaska, please request a quote prior to purchase. Items with factory packaging will be double boxed. When factory packaging not available re-usable shipping box with custom injected-foam mold will be used. (for all items over 10 lbs). Note that all items valued over $500 will require a signature upon delivery.