JBL rmc User Manual
A very sharp dip adjacent to a peak: Figure 16 shows a peak at 41 Hz with an adjacent
sharp dip at 57 Hz. A deep response dip such as this is caused by destructive interfer-
ence, and such peaks can occur either above a dominant or strong response peak, as
shown here, or below a response peak. Sometimes, moving the test microphone a short
distance will virtually eliminate the dip. (Actually, you are not eliminating the dip, but
merely moving away from it.) If this appears to be the case, you should make slight
rearrangements in the subwoofer location and even move your working space slightly.
Remember that you cannot equalize the dip - but you may be able to avoid it altogether by
rearranging your workspace.
sharp dip at 57 Hz. A deep response dip such as this is caused by destructive interfer-
ence, and such peaks can occur either above a dominant or strong response peak, as
shown here, or below a response peak. Sometimes, moving the test microphone a short
distance will virtually eliminate the dip. (Actually, you are not eliminating the dip, but
merely moving away from it.) If this appears to be the case, you should make slight
rearrangements in the subwoofer location and even move your working space slightly.
Remember that you cannot equalize the dip - but you may be able to avoid it altogether by
rearranging your workspace.
Another possible alternative here is to engage the polarity switch on the LSR6312SP
Subwoofer. Sometimes, this is all that it takes to get rid of - or alleviate - a response dip.
Do not worry about which setting of the polarity switch is "correct." Use the setting that
results in the most uniform response.
Subwoofer. Sometimes, this is all that it takes to get rid of - or alleviate - a response dip.
Do not worry about which setting of the polarity switch is "correct." Use the setting that
results in the most uniform response.
You will soon find out that relatively small changes in the position of a subwoofer along a
floor-wall boundary will make significant changes in the measurements you make. Ideally,
you would like to make the smallest correction necessary, so do not hesitate to experi-
ment with subwoofer placement. While corner locations are often touted as being the best
place to get good bass, that position usually results in fairly wide swings in measured
response. This is because of differences in distances and how the room modes are stimu-
lated. The switch setting which produces the most output also assures the phase
response is optimal.
floor-wall boundary will make significant changes in the measurements you make. Ideally,
you would like to make the smallest correction necessary, so do not hesitate to experi-
ment with subwoofer placement. While corner locations are often touted as being the best
place to get good bass, that position usually results in fairly wide swings in measured
response. This is because of differences in distances and how the room modes are stimu-
lated. The switch setting which produces the most output also assures the phase
response is optimal.
Important Note: The crossover frequency between the LSR6312SP and LSR6328P is
roughly 80 Hz. If you have carried out equalization at that frequency, or fairly close to it,
you may find that the overall response peak that you reduced in the subwoofer's response
may still be partially present. The reason is that there are two loudspeakers contributing at
that frequency. So do not hesitate to reduce the peak further using the RMC section of the
LSR6312SP. This can be done by advancing the RMC Depth Control one click at a time.
roughly 80 Hz. If you have carried out equalization at that frequency, or fairly close to it,
you may find that the overall response peak that you reduced in the subwoofer's response
may still be partially present. The reason is that there are two loudspeakers contributing at
that frequency. So do not hesitate to reduce the peak further using the RMC section of the
LSR6312SP. This can be done by advancing the RMC Depth Control one click at a time.
Adjustments
If you have more than one LSR6312SP in your system, you must equalize each one sepa-
rately, in its own position and with the others turned off. In carrying out this procedure,
you must feed each LSR6312SP directly with the input measurement signal; however,
once the equalization process has been accomplished, you can feed all of the subwoofers
in a chain by using the SUMMED OUT of one unit into the input of the next. See Owner’s
Manual for additional details.
rately, in its own position and with the others turned off. In carrying out this procedure,
you must feed each LSR6312SP directly with the input measurement signal; however,
once the equalization process has been accomplished, you can feed all of the subwoofers
in a chain by using the SUMMED OUT of one unit into the input of the next. See Owner’s
Manual for additional details.
Enter settings into the RMC Equalizer on the electronics panel of the LSR6312SP
Subwoofer. Enable the RMC System by setting the RMC Bypass Dip Switch to the OFF or
DOWN position. When you have finished equalizing the subwoofer portion of your system,
it is time to put the finishing touches on the overall system. You may want to make slight
changes in loudspeaker location, as well as adjust the subwoofer level(s) relative to the
main channels. Play a variety of music, both stereo and surround sound, before you make
any final adjustments. You can adjust the level of each subwoofer using the RMC make up
gain on the LSR6312SP electronics panel. You can play Track 27 on the RMC Calibration
CD and use the meter to calibrate the subwoofer level. Repeat the procedure for each
subwoofer in the system. You can also compare the level of the LSR6328P satellite speak-
ers using Track 2. Normally the subwoofer and satellite levels should be equal, however,
you may prefer the balance when the subwoofer output is 1-3 dB greater than the main
channel speakers.
Subwoofer. Enable the RMC System by setting the RMC Bypass Dip Switch to the OFF or
DOWN position. When you have finished equalizing the subwoofer portion of your system,
it is time to put the finishing touches on the overall system. You may want to make slight
changes in loudspeaker location, as well as adjust the subwoofer level(s) relative to the
main channels. Play a variety of music, both stereo and surround sound, before you make
any final adjustments. You can adjust the level of each subwoofer using the RMC make up
gain on the LSR6312SP electronics panel. You can play Track 27 on the RMC Calibration
CD and use the meter to calibrate the subwoofer level. Repeat the procedure for each
subwoofer in the system. You can also compare the level of the LSR6328P satellite speak-
ers using Track 2. Normally the subwoofer and satellite levels should be equal, however,
you may prefer the balance when the subwoofer output is 1-3 dB greater than the main
channel speakers.
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