M&K Sound K-7, Руководство по эксплуатации

Страница: 9 / 15

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 labeled 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.
7. 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, or other source with steady, consistent bass content. 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)
is correct.
You need to perform this test because when Main speakers are located separate from a Subwoofer, each
speaker is at a different distance from your ear. In some cases, the difference will be just enough so that the output
from the Subwoofer arrives out of phase with the output of the Satellites. When this happens, that critical mid-bass is
actually cancelled. You should re-do this test any time you move your speakers.
8. SPEAKER DAMAGE & HOW TO AVOID IT
An important factor to consider with any loudspeaker system is the potential for speaker damage. Even though
your M&K Speakers have extremely high power handling ability (especially for Main speakers), they still can be
damaged by relatively low powered amplifiers.
While very few M&K Speakers are actually returned for service, the vast majority of those returned are not for
manufacturing defects. Instead, they are returned because they have been over driven, almost always because the
amplifier or receiver used was driven into clipping distortion.
This damage is considered abuse, and is not
necessarily covered under warranty.
10
K-5/K-7 SATELLITE SPEAKER