AudioTechnolgy

[chuck55]

I post here because I want to use the 4" full range with no x-over but a tweeter for the upper octave.

http://www.audiotechnology.dk/iz.asp?id=4|a|122|||

Anyone use this driver? Looks pretty awesome.

[chuck55]

Try this link:

http://www.audiotechnology.dk


Then click on Flexbar and 4' unit

[ScottG]

I've suggested this one with a similar format before.

- to compensate for baffle step reduction you'll need either a wide baffle (a'la sonus faber stradavari), or a back horn. (..I'd suggest the back horn route and Ron D might be able to help you out with that design).

..this is the tweeter I'd mentioned before (with an additional transformer attenuator to lower its eff.):

FT96H

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

That with a cap (or inductor depending on if its a parallel or series configuration), of the correct value for the tweeter should provide a pretty nice loudspeaker.

[chuck55]

Thanks Scott, that is an interesting driver. Expensive though. My CD's only go to 20kHz so not sure about the 50kHz.
How did you decide on a horn? Is this better to integrate with a fast driver like the Audio Technology?
I was not aware the 4" needed BSC, A-T recommended a 12 liter cab. and an x-over of 6kHz with a 2-3 order slope.

[el`Ol]

Here is a cheap supertweeter:
http://www.monacor.com/int/en/prod_s...N&suche=rbt-95

[chuck55]

problem is, this driver is so good, I don't have the skill to design a proper tweeter to it.

[ScottG]

Originally posted by chuck55
Thanks Scott, that is an interesting driver. Expensive though. My CD's only go to 20kHz so not sure about the 50kHz.
How did you decide on a horn? Is this better to integrate with a fast driver like the Audio Technology?
I was not aware the 4" needed BSC, A-T recommended a 12 liter cab. and an x-over of 6kHz with a 2-3 order slope.

Almost all drivers need some form of BSC. A good back-horn will do several things: lower non-linear distortion, lower excursion, lower compression, increase spl at lower freq.s, and at the top of their range - modestly increase spl's for baffle step compensation. (here you want to start augmenting this driver's response around 250 Hz.) The trade-off is some time delay where its augmenting the driver's output. Subjectivly the benefit is enhanced clarity and a more linear freq. response.

BTW, I ment ronc (not ron d).. .

I'm not surprised that they spec. at *least* a 2-3 order slope for a *conventional* tweeter. The FT96H isn't a conventional tweeter though - for it I'd think that something around 6.5 kHz 1st order would sum fairly well with the driver (..provided of course its "padded down" with a transformer attenuator about 10-11 db). In a parallel crossover thats about a 3uf cap value placed in series with the tweeter (or actually the transformer which is then connected to the tweeter).