On Sun, 13 Nov 2005 15:53:09 GMT, chuck wrote:

wrote:
On Fri, 21 Oct 2005 14:37:54 GMT, chuck wrote:

Which of us is confused here? I offered as one solution the use of
resistive pads "... to feed a separate amplifier which then feeds the
single speaker". There is really nothing to limit the power that the
separate amplifier could produce. Use a 20 watt amplifier and get 20
watts out. Pretty simple concept.


You're right.. Missed the additional AMP included. Same as the 'off the shelf'
car amp. Doesn't seem like the fella is likely to be capable of rolling is his
own here.


I think you misunderstood what I suggested and how such an isolation
transformer would work. RF power combiners are routinely used for this
exact purpose (at RF, of course) and easily provide on the order of 30
dB of isolation. Although I have never worked with a hybrid or combiner
at audio frequencies, one can easily be designed. You can find passive,
transformer-type audio combiner circuits on the Internet. although these
are generally for low-level signals. They can provide up to 55 dB of
isolation. It is my understanding that power-level hybrids are
manufactured but I have been unable to locate any on the web. A very
simple solution if a power hybrid can be found.

The dual voice-coil speaker, as I mentioned in my subsequent post, is
undoubtedly the best solution in my opinion.


Never heard of a audio combin at high power levels. Plenty of stuff around for
low or line level combining. Never heard of anything handling 20watts. Doesn't
seem like a particularly useful thing.