7
TIPS TO GET THE MOST OUT OF YOUR M SERIES WOOFER
Your PowerBass Autosound subwoofer has been meticulous engineered and designed to handle high
power musical reproduction. Despite their rugged construction, it is possible to damage your speaker if
they are improperly used. In general, you will hear distortion as a so-called warning before any damage
occurs. If you hear distortion in your system, immediately reduce the musical level to the point where the
sound retains its clarity.
1. All PowerBass Autosound subwoofers require an initial break-in period before it will reach optimum
performance. Like any new precision machinery, allow a minimum of several days to one week with
normal daily usage to ensure that the suspension has properly been broken-in.
2. With any dual voice coils subwoofers avoid using only one voice coil. Doing so will significantly
decrease the efficiency and power handling of the speaker.
3. Be sure you supply the speakers with enough unclipped amplifier power to drive them properly.
(More damage can be done to a speaker by under-powering and clipping your amplifier than any
other way!)
4. Where possible, run your Speakers in mono instead of stereo. Most bass is reproduced in mono so
there is less chance of any cancellation if played in mono.
5. Where possible, wire your Speakers in parallel instead of series. Bass is reproduced either way but
again there is less chance of cancellation in parallel. NOTE: Be sure the amplifier you are using is
stable to the resulting impedance of the speaker load!
6. Where possible, a separate amplifier just for your subwoofers should be used with an electronic
crossover to set the frequency range. One amplifier with passive crossovers will work (Tri-Way
Setup), but the system will do more with less stress on the amplifier by using two amps.
7. Do not block the front of your speakers or ports. You want as much direct air coupling as possible.
Also be sure to round off the inside edges of the port to reduce any port noise.
8. For ported enclosures, keep in mind that you must leave at least twice the port diameter size be-
tween the subwoofer and the port itself. Leave at least the same distance between the port and any
walls of the enclosure as the diameter of the port. (e.g. if you use a 4” port there should be at least
4” between the back of the port and the back of the box.)
9. Remember the Golden Rule “Measure twice…cut once.”
