The other method would be to use an active cross over to filter out what you don't need and feed that signal to the amp, so the amp only has to work with the frequency it is fed. I'm sure this is how the multi amped systems with electronic cross overs work right now and keeps the amp from amplifying unwanted signals.
haron
Hi haron,
The issue which Theo asked about is this ... if you
are using an active XO and so feeding, say:
* low signals to a bass-driver amp
* mid signals to a mid-driver amp, and
* high signals to a tweeter amp
... then is it possible to optimise the behaviour of each amp for the band of frequencies which it is reproducing?
For instance, if an input coupling cap is known to lose base, then certainly
don't use it for the bass amp. And as Hugh has explained, if a teflon cap enhances the top end then certainly use it in the tweeter amp - but not in the bass amp.
Along similar lines, tweeters don't generally need as much power as mid-range drivers. So I have a LF55 modified to become a "LF25" to drive my Maggie ribbons (by reducing the +/- DC rail voltage) as this makes it sound much sweeter in the top end than the "normal" LF55.
Regards,
Andy