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5) Begin by setting the levels of the main, center, and surround speakers one at a
time. While pointing the meter toward the speaker active with the test tone, set each
channel to the same reference level while the SPL meter remains about in the listening
position. Your goal is to establish an even output level of each speaker from that spot.
Setting the MFW-15 Subwoofer Gain
6) Once nished with the other speakers in the system, direct the test tone to the
subwoofer. Adjust its level using the gain control (labeled “VOLUME”) on the MFW-15
subwoofer until it reaches the SPL level achieved by the other speakers. An assistant
will be very helpful for this process because the meter location and subwoofer level
adjustment location will be different. Some like to run their sub “hot” for movies by
increasing the sub level by 5 dB or so above the main channel level. This can be very
effective at lower listening levels, but be sure to use care when watching that big
action movie for the rst time - especially at or near reference levels.
7) Once the subwoofer is calibrated, small adjustments can be made easily using the
subwoofer level control in your processor or receiver. If you nd the need to go much
above +2 or +3 consistently, we recommend adjusting the gain control on the MFW-
15 upward instead and using a lower number for reference level on the processor.
MFW-15 Crossover and Phase Adjustments
After setting up the system reference levels on each channel, including the subwoofer,
it’s time to set the crossover (where applicable) and the phase switch (where
necessary). This activity will round out the effectiveness of the subwoofer as an
extension of the main speakers, rather than a box in the room making noise!
Setting Subwoofer Crossover
This adjustment is between 40-150Hz. If your preamplier/processor has a dedicated
“LFE” or “SUB” output, then you should be using the input jack labeled “LFE”. This input
bypasses the crossover because the ltering function is handled upstream in the Dolby
Digital/DTS processor. When your processor is not on a Dolby or DTS source format, it
will make the necessary ltering for the LFE output so this input conguration will yield
the best result for that equipment. If you have a home theater system, this is more than
likely the input you should use.
If you do not have a dedicated output for the subwoofer, you should be using the
left and right “LINE INPUT” jacks. In this situation it is recommended to use the
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