Inverted Amplifiers

In the following thread you'll find several suggested methods for setting the phasing of subs relative to mains, which is what it sounds like you are trying to do:

http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1258010309

Keep in mind that both possible settings are probably compromises to some degree, and are influenced by the physical positioning of the subs relative to the mains.

Regards,
-- Al

Any of the methods indicated in the thread I linked to, or that Stan referred to, will allow you to determine the correct setting of the 0/180 switch, without first determining if the amplifier inverts.

Alternatively, you could contact the amplifier manufacturer and ask them. And sometimes their literature or website pages will indicate inverting or non-inverting. If nothing is indicated, as Elizabeth said the chances are it is non-inverting.

If you have the wrong setting, the symptom will be very weak reproduction of bass frequencies that are in the region of the crossover frequency. Nothing will be harmed, though, if that is not clear.

However, unless the sub's literature indicates it is ok to do so, it might be best to avoid changing the setting of the 0/180 switch while power is on, to prevent the possibility of transient thumps that may occur as the switch is being changed.

Regards,
-- Al