Specifications

THE MCINTOSH CUSTOM
EQUALIZER ELIMINATES
THE LAST MAJOR SOURCE
OF DISTORTION IN YOUR
STEREO---YOUR ROOM
A Mclntosh Environmental Equalizer:
• Adjusts for musical balance in your listening
room tailored to your personal needs •
• Restores musical balance when you move your
speakers•
• Restores musical balance if you move to a new
room •
• Reduces distortion caused by room construc-
tion, materials and dimensions •
Mclntosh equalizers are two stereo equalizers in
one: the first, programmable filters that correct for
listening environment induced musical imbalance,
distortion and frequency modification, the second,
low frequency compensation for use with superior
performing Mclntosh loudspeakers.
The room in which you listen affects your listen-
ing pleasure by modification of the musical data
caused by room resonances, a characteristic of
room dimensions; stiffness of room surfaces, a
characteristic of the material of which the room is
constructed, and distortion, a characteristic of the
construction methods. Each filter can be set for fre-
quency and bandwidth and is adjustable for
amplitude boost or cut.
Extensive testing of home living rooms and stereo
store listening rooms indicates that room dimen-
sions influence the performance of loudspeakers
with the most pronounced effects below 250 Hz.
Speakers which appear to have no highs and sound
"boomy" usually are the victims of a poor listening
environment. By eliminating the low frequency
peaks caused by room conditions, the highs will ap-
pear to be restored and the "boomy" sound will be
gone. In many "problem" rooms, the difference with
and without the correction is literally night and day.
The Mclntosh MQ 107 Environmental Equalizer
has fourteen programmable filters that are custom
adjusted to restore the desired musical balance and
low distortion capability of your stereo. There are
seven filters in each channel. Attention to the higher
frequency correction is achieved through the High
Frequency Compensation controls in each channel.
Loudness balance can be restored to the overall
musical information with output level controls for
each channel.
Mclntosh loudspeaker systems have a unique
combination of moving or sound producing parts,
cabinet, and acoustic damping material. The design
relationship of these many elements produces ac-
MQ 107 Custom
Environmental Equalizer
curate control of the woofer cone motion. Control is
achieved in a low frequency radiator by increasing
the size and effectiveness of the magnetic structure.
This causes the radiator to have a rising response
with frequency. The second equalizer circuit (Low
Frequency Compensation) provides control to ad-
just the low frequency response of the Mclntosh
loudspeaker to 20Hz regardless of placement in your
listening room.
In some homes, the acoustical response of the
room, when measured with a 1/3 octave acoustical
analyzer, will occasionally eliminate the need for
compensation. In such rooms where resonance or
room gain compensates for much of the rising
response of the Mclntosh woofer, the programmable
filter sections can be used to make any further im-
provements. In this case, the compensation controls
would not be used.
In most rooms, the compensation controls are
very useful. The design allows correction for dif-
ferent room gains that occur when the speaker is
placed on the floor in a corner, against a wall on the
floor away from the corner, or off the floor and away
from the corners of the room. The low frequency
compensation controls can select from five curves
to support these different locations.
Effective corrective adjustments must be made by
persons that have knowledge, experience, training
expertise and proper 1/3 octave acoustic analyzer
equipment.
Your musical pleasure will be fulfilled and your
stereo investment protected with the properly pro-
grammed Mclntosh Environmental Equalizer.
MQ 104 Custom
Environmental Equalizer
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