American Acoustic Development M Series - Manual (Page 6)

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Crossover frequency control
If you are using small loudspeakers (4 " to 6 " woofers) in your main system, your will
need to set the crossover frequency at a high position(100 to 160Hz). If your main
speakers have larger woofers(8 " and above) you will need to set the crossover
frequency to much lower position (40 to 80 Hz). Generally, the larger the speaker, the
greater the low frequency output will be. If the frequency control is set too high, the
bass will appear " boomy " due to outputs of subwoofer and main speakers overlapping
each other. If it is set too low, the bass will be ill defined and the subwoofer will
sound detached from the rest of the system.
Phase Control
Use this control to determine the best possible bass performance of your system.
There can be interference between your main speakers and subwoofer at the
frequency where they cross over due to placement, room acoustics and type of main
speaker used. By carefully positioning the subwoofer in the room in combination with
the level and crossover control, you should be able to get a seamless transition
between your main speakers and subwoofer. Start with the full anticlockwise 0 degree
position. This means that the subwoofer will push out positive pressure wave
corresponding to a positive electrical input. The 180 degree full clockwise position
inverts this so the subwoofer will put out a negative pressure wave. You can use this
position if you are unable to get a good integration between the subwoofer and main
speaker.
Power input socket and Fuse
For continued protection, replace only with same type fuse.
Line In/ Line Out
Connect Line in to the subwoofer output of your amplifier/receiver. If you do not
have a subwoofer output, you can connect up the subwoofer using the Line In/Out
utilizing a tape input/output amplifier/receiver. Connect the tape output to the Line
Input on the subwoofer, then connect the tape input to the Line Output on the
subwoofer. To switch the subwoofer into the circuit, switch the tape monitor input on
your amplifier/receiver.
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