Tech Square

line level passive xovers? !st order high pass only - to a tweeter

203.129.46.201

I'm wondering if my research costs - in money AND time - in arriving at a 'good blend' to a LP-less bass-midrange driver might not be lower - and more satisfying - going with a HP input filter on the tweeter amp?

We know the relevant output Z and input Z's fairly accurately, and that these are far more stable across the bandwidth / under real signal conditions - than the Z's at spkr level are.

I am considering a modern low Fs (~500z & lowQ) 91db/w (no padding R's) 25-28mm dome at first order off a single 'GOOD' cap - to replace the existing treble system*.

*A '70s Foster/x 35mm soft dome >94db/w, 8? watts - with xover -3db @3.5k, padded, Eq'd, and FS trapped, two air coils, laddered MF polycarb caps!!! It cascades to 3rd order PDQuickly, due to the very sharp \/ Fs notch at 1.1k!

I have an OOBand RC 1st order input filter on the (triode mode) treble amp, <200hz, to limit the bass getting to the HP only crossover, it did sound a teeny bit cleaner! No other change. Even with air coils and the padding R's etc. The mid-bass driver is fed direct from the amps that is in UL.

would the type of R's and Caps still be critical, IE are $$$$$ caps, and Vishays going to be essential? The system has been able to let me hear the difference tefs make in RIAA circuits from MKP's! ? nicer, less edge!?

Warmest
Timbo in Oz
The Skyptical Mensurer and Audio Scrounger
And gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
http://www.theanalogdept.com/tim_bailey.htm

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