In article ,
Wally wrote:
Given that my speaker rebuild fantasy is gradually taking shape, I'm
starting to think about what to do about crossovers. The plan is to
bi-amp, one amp to the B139 drivers, the other to the B110/T27. I'd
rather ditch the orginal KEF DN12 units and make new ones for the
mid/top, probably keeping to the spec crossover frequency. So, I have
some questions about components...

Am I right in thinking that air-cored inductors are better than those
with some sort of ferrite(?) core? For the same value, would an
air-cored version be physically larger? If so, is that because it
requires more turns?

What is the best type of capacitor to use wthin sensible cost limits?

If you are going to bi-amp, it makes much more sense to design the
crossover to go before the amplifiers - it's much easier to produce
filters using ICs than large inductors and capacitors.

--
*Just give me chocolate and nobody gets hurt

Dave Plowman London SW 12
RIP Acorn