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Old 29th January 2009, 06:37 PM   #2861
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Default Re: Driver ? Post #2853

Quote:
Originally posted by tb46
Hi just a guy (Post #2853),

I think aceinc (Post #2848) and cowanaudio (Post #2849) were talking about the CSS TRIO-8 8" driver, its Sd=213cm^2.

Regards,
Oliver.
G'day Oliver

The W8-740P is the driver I was referring to.

Cheers

William Cowan
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Old 29th January 2009, 06:37 PM   #2862
tinitus is offline tinitus  Europe
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Quote:
Originally posted by just a guy
I'm always talking about the tang band w6-1139

Justaguy, I can get that TB W6 from a dutchman

Have you showed a design...and how deep will go

The supplier talks about a DVC version too...any knowledge about that one

Only one new model on TB site, a bit different
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Old 29th January 2009, 09:43 PM   #2863
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I posted a range of designs from 14 - 30 hz tuning in the last couple of weeks (including Volvotreter's excellent 30 hz tapped horn). It will go as low as you make it go, but you give up spl potential for lf extension.

The driver in my possible designs is the w6-1139SI from partsexpress. I don't know anything about any of the other models of w6-1139.
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Old 29th January 2009, 09:56 PM   #2864
tinitus is offline tinitus  Europe
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Quote:
Originally posted by just a guy
I posted a range of designs from 14 - 30 hz tuning in the last couple of weeks

(including Volvotreter's excellent 30 hz tapped horn). It will go as low as you make it go, but you give up spl potential for lf extension.


I remember now, thanks

Didnt realise that the W6 TB was the one used in Volvotreters TH...its BIG

btw, he use drivers W6-1139SC / W61139SG / W61139G...
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Old 29th January 2009, 10:41 PM   #2865
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Quote:
Originally posted by tinitus ...its BIG
At 45L, it's the smallest design I posted. The largest was 110L. The one I'm working on is about 51L.
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Old 30th January 2009, 02:19 AM   #2866
tb46 is offline tb46  United States
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Default Cowanaudio Post #2861 - THSPUD

Hi William,

Thanks for the clarification, I'm having a hard time keeping track of what has been going on in the tapped horn threads. Life and work interfering with the hobby.

Any additional information pertaining to the use of the W8-740P in the THSPUD would be appreciated. When I model this driver in hornresp the SPL response is almost identical to the response using the MCM 55-2421, and both have quite a bit higher humps and bumps than the CSS TRIO-8 (again, modeled in the same box from Post #2821); and using mwmkravchenko's data (Post #2832) the SPL response looks even worse.

In the tapped horns for dummies thread (Post #208) Tom Danley showed a measured response, that does not correspond to my modeled hornresp response. This seems to have become a theme, anyway, a speaker that does have a SPL response in hornresp that is quite similar to Tom's measured response curve is the TangBand W6-1042J 6"x9" (modeled in a very similar box).

Anyhow, thanks for clarifying, and I agree sooner or later there has to be saw dust involved.

Regards,
Oliver.
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Old 30th January 2009, 02:49 AM   #2867
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G'day Oliver

I did the same thing and was amazed that all the response features line up perfectly (At least below 200Hz where we have data). They are lower in Q than predicted, but all the peaks and dips fall at the same frequencies. That's why I believe the W8-740P in the Spud enclosure as drawn is right on the money, or at least very close. Damping in the line could be responsible for the reduction in Q of the response features as measured.

Cheers

William Cowan
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Old 30th January 2009, 03:25 AM   #2868
tb46 is offline tb46  United States
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Hi William,
Thanks, it is interesting that lining the walls would produce such a pronounced difference.
Regards,
Oliver.
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Old 30th January 2009, 06:57 AM   #2869
FlipC is offline FlipC  United States
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Oddly enough I have been wondering this exact thing.
My TH Mini clone is within a few DB of being the exact same. My 115 on the other hand is no where near it unless I make it just over 500 Lt. But the 115 itself has an outer size of 420 Lt. So I wonder if this could be made up by dampening ? Since clearly the Spud is lined at the driver(s).
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Old 30th January 2009, 11:21 PM   #2870
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I'm hoping to get a reality check on the measured parameters from anyone with experience measuring parameters. I'm pretty sure some of the parameters are good (fs, qts, qes, qms, Le), not so sure about VAS. Re measured using an ohm meter, and corresponds with the lowest spot in the impedance sweep in LIMP.

Click the image to open in full size.

The driver was tested several times over several days, all the while being used in the small sealed box to break in.

The large difference in VAS measurement could be a big problem, not sure which to trust. VAS seems to be a factor used to calculate CMS, RMS, MMD and BL, so it would appear to be incredibly important.

Opinions? Which number should I use? An average?
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