Trevor Wilson wrote:
"Theo" theo*+*@*+*letsblowitup*.*com wrote in message
.uk...
how can I tell if either of my amps are bridgeable, I want to run a
subwoofer in mono and I have no manuals for either...

sherwood AX4103
denon PMA-720

**All amplifiers (save a minute number) are bridgeable. What dictates
the success of such an operation are the following:

* The MINIMUM impedance of the speaker.
* The MINIMUM impedance that the amplifier is rated to drive.

Divide the minimum impedance of the speaker (not the average
impedance, which is the usually supplied figure) by 2. If that figure
is lower than the minimum impedance rating of your amplifier, then
you can't do it.
Some general rules of thumb (or is that thumbs).

* Unless the manufacturer provides specific switching, or bridging
adaptors, they should not be bridged.
* Very few Denon amps can be successfully bridged into less than 8 Ohm
loads.
* Since Sherwood amps are generally crap, they cannot be bridged into
ANY speaker.

whats the best option for driving my sub then? new amp or is there another
way?