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Old 5th October 2012, 08:01 AM   #21
Vix is offline Vix  Yugoslavia
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Hi,

While I like the actual look of the stealth woofers, it would be nice to know if anyone had tried the OB bass (i.e. some 15" or 18" in H-frame). Assuming that one has enough space to place it, it may work...
I am saying this because I remember that some time ago Jeff (Godzilla) had tried smallish BIBs with H-frame woofers underneath and was very satisfied with the sound....
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Old 6th October 2012, 01:32 PM   #22
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Are you sure about that? Not much info on the Fosters, but plate amps often have a ~100 to 125Hz second order XO when using the high level speaker outs.


Quote:
Originally Posted by chrisb View Post
in other words, the mains are not high-passed - which at higher volume levels could result in some strain if driving a FR near/past comfortable excursion limits
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Old 6th October 2012, 04:34 PM   #23
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If Jack Hidley doesn't still have it up, i have the info at home. The Fosters have a variable 2nd or 3rd order low pass, <50~150 Hz. Not ever used the high level in.

dave
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Old 7th October 2012, 06:09 AM   #24
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by fastbike1 View Post
Are you sure about that? Not much info on the Fosters, but plate amps often have a ~100 to 125Hz second order XO when using the high level speaker outs.
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Originally Posted by planet10 View Post
If Jack Hidley doesn't still have it up, i have the info at home. The Fosters have a variable 2nd or 3rd order low pass, <50~150 Hz. Not ever used the high level in.

dave
pretty sure about how this particular implementation was set up- i.e. at speaker level, piggy backed in parallel to the mains via Pomona dual banana plugs

even if the Foster ( or other) plate amp(s) had a HP on the speaker outs, I'm guessing that to keep part size to a minimum at the 120-150Hz range they be using EL caps, which I'd generally want to avoid at all costs . decent quality film caps and air core inductors for even a simple 1st order XO at these frequencies could easily cost half or more the price of budget plate amps - not to mention take up more space than the entire power supply

My own setup with the Foster amp is the opposite of Dave's - it's tidier for me to use the line level inputs
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Last edited by chrisb; 7th October 2012 at 06:13 AM.
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Old 7th October 2012, 07:18 AM   #25
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I thot you were using the Rotel to drive the woofers Chris.

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Old 7th October 2012, 09:57 PM   #26
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by planet10 View Post
I thot you were using the Rotel to drive the woofers Chris.

dave

in the downstairs (HT) system yes - the SDX7 is upstairs adding bass support to the Microtowers
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Old 2nd May 2013, 05:03 PM   #27
BertW is offline BertW  Canada
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Hello:

Pls direct me to the plans for your push-push
woofer cabinet for ur CSS SDX7eN driver. Or
do u flat pak?

I have ur FH Mk3 w/ Mark Audio enabled drivers.
Regards,
Bert
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Old 2nd May 2013, 05:38 PM   #28
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Hi Bert,

I did get your email, haven't had a chance yo reply. After the push-push TL that Bud has, we moved to sealed enclosures for the SDX7, Optimally 14-17 litres, but 7-21 is the usable range.

Do you have SDX7 in hand?

dave
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Old 3rd May 2013, 04:17 PM   #29
BertW is offline BertW  Canada
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Hi Dave:
I need a driver, & plate amplifier, & flat pak if available.
Pls explain where my calculations have gone awry.
17 litres = 17000 cubic mm, the cube root of
which is 25.7123 mm or roughly icubic inch. I know the
enclosure has to be roughly the size of 4 - 4 litre jugs
of milk.

Regards,
Bert
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Old 3rd May 2013, 05:43 PM   #30
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Bert,

SDX7 is not available new any longer althou i know where 4 are available in the US (maybe).

17 litre = 17,000 cm^3 = 1,700,000 mm^3

dave
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