Acoustic Energy MA1108 - Manual (Page 6)

Page 4 Page 4
6. Controls & System Setup 8. The Linear Range
7. Specification
Type: Closed box, active subwoofer.
Drivers: Downward facing 220mm pulp cone with
48mm thermally bonded voice coil. High-power
long-throw magnet system.
Low Frequency Cut-off: - 6dB @ 30Hz
Amplifier: 200 Watts into 8 Ohms
Low Pass Filter: 2nd order, 35Hz to 80Hz
Input Sensitivity: 300mv for rated output
Dimensions (H x W x D): 497 x 430 x 390mm
Weight: 26.0kg (single, unpacked)
Acoustic Energy reserves the right to modify
product specifications.
Subwoofer Crossover Frequency
As you adjust other parameters you may find that moving the crossover
frequency a little from the suggested starting value is beneficial. Adjust
other aspects of the setup, particularly subwoofer location and phase, before
adjusting the crossover frequency significantly.
Sub-woofer Volume
Setting the subwoofer volume is important in terms of both overall system
balance and the demands of different types of programme material. You
may find that material with an emphasis on music works better with a lower
subwoofer volume than movie material with an emphasis on “effects”.
Finding a compromise between the two is a matter of subwoofer volume
adjustment in parallel with adjusting its position in the room.
Sub-woofer Location
Broadly speaking, the closer a subwoofer is to the corner of the room
(assuming the walls are solid) the more bass it will generate in the room (and
the lower its volume need be set). Moving the subwoofer closer to a corner
however will also tend to reduce the consistency subwoofer volume over the
listening room (a corner location being the worst in this respect). Positions
closer to the corner will also tend to change the character of the bass
produced by the subwoofer - it will emphasise the very lowest signals more.
This change in bass character with location is the variable that enables a good
compromise position for the subwoofer to be found.
Sub-woofer Phase
Switching the subwoofer phase should be left to last. If a good subwoofer
position is proving difficult to find, try again with the phase reversed.
Linear 8 Rev E 16/8/05, 9:57 am 4