"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.


--
Trevor Wilson
www.rageaudio.com.au