LCR-750THX & Center-750THX
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If you mount the surrounds on the side wall behind the listening position, they can be aimed towards each other
or angled towards the back wall or the side wall surface directly behind them. By reflecting sound behind the listening
position, you may increase the sense of envelopment in the sound.
If you want or need to mount speakers on the back wall of the room, there are several options. You can aim them
so that they fire towards each other (so they fire along the back wall); you can aim them towards the front wall of the
room; or you can angle them so they fire toward the side walls. Symmetrical arrangements work best.
The speakers should be a minimum of a few feet away from the nearest listener. Ideally, the surround speakers
should not call attention to themselves as separate sources of sound.
If the surrounds must be located close to the listeners, aiming them at the room walls or even the ceiling can help
to reduce any directional effect. As described above, this can produce a desirable result even in rooms where the
surround speakers are an adequate distance from the listeners' heads.
If the surrounds cannot be placed on a wall, try placement on tables or the floor to the sides of the main listening
position, firing up towards the ceiling. This can work very well in environments that do not allow permanent attachment
of speakers to the walls.
Some listeners prefer to use multiple pairs of surround speakers. While this is not necessary, it can provide a
broader and deeper surround effect, with better coverage in very large rooms. When using multiple pairs of surround
speakers, a symmetrical installation pattern works best. For example, if you are using two pairs of surround speakers,
one pair could be mounted on the back wall of the room, mounted equidistant from the back corners, with the other pair
mounted on the side walls of the room, equidistant from the same back corners.
The surround channels can be installed in a wide variety of locations, but because they are usually mounted on
the walls of the room, they can be a challenge to successfully install. If you have further questions, please call us at
the M&K factory, and we will be happy to discuss them with you in detail.
SUBWOOFER
Subwoofer location for Home Theatre systems is essentially the same as for music systems. See our Subwoofer
operation manual for more details. Remember to leave 2 - 3 feet of clearance between any television and subwoofer,
unless the subwoofer is magnetically shielded.
The preferred connection for the subwoofer is a subwoofer output from the amplifier or controller. This insures
that a full bass signal is being fed to the subwoofer. If you do not have such a subwoofer output jack, connect the
subwoofer to the front Left and Right channel amplifier outputs (do not use the Center channel).
VERY IMPORTANT: When the Subwoofer is connected to the Left and Right amplifier outputs, and the controller
is in Pro-Logic mode, the switch on the Pro-Logic control unit labelled Center channel WIDE/NORMAL must be set to
the NORMAL mode. If the switch is set to the WIDE mode, the bass content of the Center channel will not be fed to
the Subwoofer, and you will lose a significant amount of bass.
9. SATELLITE/SUBWOOFER PHASING TEST
In any system using a subwoofer separate from Main speakers, a phasing test must be performed to insure good
bass blending. This test insures optimum sound in the critical bass frequencies where your Subwoofer and Main
speakers overlap.
Play a familiar CD, DVD, LP, or tape with steady, consistent bass content through your system. Listen carefully
to the "mid-bass" region of 75 - 125 Hz. This is the part of the spectrum where electric or string basses and drums
predominate. Then reverse the phase of either the subwoofer or BOTH Main speakers.
If your Subwoofer has a PHASE switch on its back panel, move it either from (+) to (—) or vice versa.
If your Subwoofer does not have a PHASE switch, it takes a bit more work. You will have to change the Positive
and Negative speaker inputs on the back of BOTH Main speakers.
You can do this at the back of both Main speakers, or at the Subwoofer's TO SPEAKERS terminals, but never
at both locations. The lead that was on the Positive (+) terminal should be switched to the Negative (—) terminal, and
vice versa. When switching speaker wires, take care to protect your amplifier. Make sure that the wires do not touch
each other when you are making the switch. As a safety measure, we suggest that you turn the amplifier off before
making the switch.
Now listen to the same musical passage as you did earlier, concentrating on the mid-bass region. If you hear less
bass, the original connection (or switch position) was correct. If you hear more bass, the new connection (or switch)