AMPLIFIER
OUTPUTS
RIGHT LEFT
[, _1--',l
@
RIGHTBU-2
SUBWOOFER
RIGHTSATELLITE
@
LEFTBU-2
SUBWOOFER
LEFTSATELLITE
If you are using two BU-2 subwoofers as a stereo pair wi_.
a pair ofsateUites,connect them as shown in Figure 8.
NOTE: The BU-2 subwoofer does not have a built-in
passive crossover which would roll off your satellites' lower-- .....
frequencies. However, the BU-2 does have a variable
frequency control that can be used to block unwanted
frequencies (between 50 "-200 Hz) from being reproduced by
the subwoofer.Where you set this control depends on the low
frequency capabilities of your satellite speakers. Adjust this °
knob to the lowest frequency that your satellite speakers were
designed to reproduce (refer to Operation, step 8).
Figure 8
OPERATION
1. Initially set the BU-2's Volume control E) (Fig. 2) to
12 o'clock.
2. Initially set the BU-2's Frequency control O (Fig. 2) to 12
o'clock.
3. Slide the BU-2's Phase switch O (Fig. 2) to the =NOM"
position (for normal polarity).
4. (Optional) Slide the BU-2's Auto Power switch O (Fig. 2)
to the =ON" position (otherwise "OFF" defeats auto-sensing).
5. Turn on your entire audio system.
6. Turn the Volume control O (Fig. 2) to its mid position. If
no sound emanates from the subwoofer after the auto-sensing
system turns it on (i.e., LED goes from red to green), check
the ac line cord and input cables. Are the connectors on the
cables making proper contact? Is the ac plug connected to a
"live" receptacle? Once you have confirmed that the subwoofer
is active, proceed by playing a CD, record, or cassette. Use a
selection that has ample bass information.
7. Set the overall volume control of the preamplifier orstereo
to a comfortable level. Adjust the subwoofer's Volume control
O (Fig. 27-until you obtain a pleasing blend of bass. Bass
response should not overpower the room, but rather be
adjusted so there is a harmonious blend across the entire
musical range. Many users have a tendency to set the
subwoofer volume too loud following the belief that a
subwoofer is there to produce lots of bass. This is not entirely
true. A subwoofer is there to enhance bass, extending the
response of the entire system so the bass can be felt as well as
heard. However, overall balance must be maintained;
otherwise, the music will not sound natural. An experienced
listener will set the volume of the subwoofer so its irfipact on
bass response is always there but is never obtrusive.
8. The Frequency control (_ (Fig. 2) sets the high frequency
roll-off, adjustable from 50 to 200 Hz. Where you set this
control depends on the low frequency capabilities of your
satellite speakers, system placement, and other factors affecting
the mid-bass region. Turn the control UP (clockwise) until
you feel there is too much" mid-bass information (around
100Hz) then back the control down a bit until that area
sounds more natural. To hear more low bass, turn the
Frequency control DOWN a bit and the Volume control UP
by about the same amount. This will increase low bass while
leaving the mid-bass sounding the same as it did before the
adjustment. To reduce low bass without changing mid-bass,
turn the Frequency control UP and the Volume control
DOWN. Alternately slide the Phase switch between "NOM'
and "REV" positions while listening to music. The selection
that sounds the best is the correct adjustment for your system.
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