4
Installation
·
Low Frequency Compensation
Low Frequency Compensating Control centered at 30Hz
allows bass centered at 30Hz to be boosted by up to 12dB.
·
Five Equalizer Bands
Five Equalization bands centered at 50Hz, 80Hz, 150Hz,
300Hz and 600Hz. provide adjustment for the five most sig-
nificant frequency bands which are affected by room acous-
tics.
·
Variable Equalizer Controls
Five Boost and Cut Controls, one for each band. Each of
the five frequency bands can be boosted or cut by up to
12dB.
·
Variable Q Controls
Five Q controls, one for each band. The Q or band-
width of frequencies above and below the center frequencies
can be adjusted from a narrow with Q of 4 to a broad
bandwidth with a Q of 0.6.
·
Balanced and Unbalanced Connections
Both Balanced and Unbalanced Inputs and Outputs are pro-
vided.
Safety Instructions cont, Introduction,
Performance Features and Installation
Never spill liquids into the equipment through enclosure
openings.
20. Unplug the power cord from the AC power outlet when
left unused for a long period of time.
Repair of Equipment:
21. Unplug this equipment from the wall outlet and refer
servicing to a qualified service personnel under the fol-
lowing conditions:
A. The AC power cord or the plug has been damaged,
B. Objects have fallen, or liquid has been spilled into
the equipment,
C. The equipment has been exposed to rain or water,
D. The equipment does not operate normally by follow-
ing the operating instructions contained within this
owners manual. Adjust only those controls that are
covered by the operating instructions, as an im-
proper adjustment of other controls may result in
damage and will often require extensive work by a
qualified technician to restore the product to its nor-
mal operation,
E. The equipment has been dropped or damaged in any
way,
F. The equipment exhibits a distinct change in perfor-
mance - this indicates a need for service.
22. Do not attempt to service beyond that described in the
operating instructions. All other service should be re-
ferred to qualified service personnel.
23. When replacement parts are required, be sure the ser-
vice technician has used replacement parts specified by
McIntosh or have the same characteristics as the origi-
nal part. Unauthorized substitutions may result in fire,
electric shock, or other hazards.
24. Upon completion of any service or repairs to this prod-
uct, ask the service technician to perform safety checks
to determine that the product is in proper operating con-
dition.
Introduction
The MQ109B can be placed upright on a table or shelf.
Cool operation ensures the longest possible operating life
for any electronic instrument. Do not install the MQ109B
directly above a heat generating component such as a high
powered amplifier.
The MQ109-B Environmental Equalizer provides an easy
and convenient way to correct room acoustic conditions that
can affect the performance of a quality loudspeaker system.
Loudspeaker performance is affected by the listening room
due to loudspeaker location, position of the listener, room
dimensions, room surfaces, and reflections from furniture or
substructures in the room. The acoustic characteristics of a
typical listening room can affect loudspeaker performance
Performance Features
usually at frequencies of 1200Hz and lower. and can alter
frequency response as much as ± 30dB.
Standing waves or room resonances occur due to reflec-
tions of the sound from wall to wall, from floor to ceiling
and from any other room structures. These frequency re-
sponse variations are the greatest in a cube shape room,
with equal dimensions from wall to wall and floor to ceiling.
A high quality loudspeaker with the ability to radiate per-
fectly uniform frequency response can have its sound char-
acteristics changed drastically by a room with severe stand-
ing waves. In most every case the change will degrade the
listening. The most common effect is one or more peaks/dips
in the bass frequency range.
