"Lionel" wrote in message

Arny Krueger a écrit :

Also, consider what sort of Xmax we are talking about. 0.3 mm is
very small Xmax for an 8" driver that we expect to reproduce 80 Hz
cleanly. If Xmax were 2 or 3 mm, I would be more likely to excuse
it. Of course, I'd like to see Xmax of 10mm or more for a subwoofer.

My problem Arnold is that I don't really like the sound of "modern"
speakers because I like quick and precise answer from the bass an not
this diffuse and not well defined loud bass that we can hear from a
lot of speakers and moreover from a lot of subwoofer.

Does this mean that you like your midrange and treble intermodulated with
bass and midbass?

In fact I just need to reproduce with the maximum fidelity the sound
of a double-bass.

Do you like your flutes intermodulated with the sound of a double-bass?

I understand that my point of view is perhaps not really academic,
but I should also comply with the fact that there is no banker in
Chapuis' family. ;-)

http://www.madisound.com/fostex.pdf

At 94.35 each, its not exactly a cheapie.

Often a 2 KHz crossover can be done with just a cap. This woofer is
smooth enough in the breakup region that you don't have to get
agressive about rolling off its high end. The other thing to watch
out for is tweeters that actually get a peak in their low end
response when driven with a simple capacitor.

I have learnt about this issue. I was thinking at a transition with a
simple 0.47 µF cap according to Fostex recommendations (perhaps a
Jensen one in order to give a little bit of blue blood to my
speakers) ). I will built these speakers like that because I like
the horn design and that it will put me serious problem of
construction skill ;-).

You didn't say what the transition was to, did you?

Thank you anyway for these interesting technical comments. I hope that
when the the speakers will be finished I will be able to make
objective critics. I guess that at this moment your today comments
will be usefull. Now I am too much engaged, I already dreams of them.

The last speakers I built used an approx 6.5 inch woofer and a ring
supertweeter. I think the two drivers otgether were under $100. The 6.5 inch
woofer, while not a subwoofer, can move about 10 times as much air without
excess distoriton, as the FF225K.