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music accompaniment should sound as if it were cut from one cloth,
not separate.
If the voice sounds “thin” or does not have enough “chest” to its
sound, turn the woofers amplifier’s gain up till it does. If you find that
turning the volume up creates too much low bass and makes the
speakers sound boomy, you will then need to work on the low pass
filter.
Low Pass filter
This control will lower the upper-frequency cut-off point of the
woofer. It does not affect the lower-frequency cut-off point of the mid-
bass couplers.
Turning the low pass filter up to a higher number will extend the
upper bass regions at the crossover point between the woofers and
the mid-bass couplers without affecting the low bass level. Some
rooms may require you to set the low pass filter up to 130Hz, while
others will require you to lower it down to 80Hz.
Do not be afraid to increase this control to give the sound more body
or to make the balance “warmer”. There is a balance between the
setting of the bass gain control and the low-pass control. The trick is
to find this balance.
Next, set the woofers using more than just a voice. Select some
music that you know to have good deep bass. Set the gain on the
woofers for a natural and powerful bass sound. Use a symphonic
piece of music if you can, or use a natural bass instrument for your
guide. Try to make it sound real. You may have to return to the vocal
to make sure you have not gone too far in one direction or the other.
At this point, if there is not enough mid bass, turn the low pass
number to a higher position or, alternately, position the main
speakers closer together in order to achieve better mid bass
coupling between the main speakers. If it sounds too “fat” turn the
low pass control down or adjust the volume.
Small rooms have more bass gain, hence the smaller the room, the
higher the low-pass frequency to use, and the lower the bass gain
level. The larger the room, the lower the low-pass frequency to use,
and the higher the bass gain. The two knobs are turned in opposite
directions – what you want to achieve is balance.