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Old 21st March 2009, 10:22 PM   #11
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How about these ?

http://www.parts-express.com/pe/psho...18&ctab=1#Tabs

http://www.parts-express.com/pdf/264-818.pdf


Look like a righteous choice to me. Fairly efficient, pretty wideband , 8 ohms, and only $18 ea.

Those 5 1/4" Peerless ? I know they're only $2.50 ea. , but sometimes you get what you pay for.

. . . AND , the 1.1cu.ft. Vas will require a MUCH larger cabinet.


..........................Blake
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Old 21st March 2009, 11:35 PM   #12
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Quote:
Originally posted by Nihilist
How about these ?

http://www.parts-express.com/pe/psho...18&ctab=1#Tabs

http://www.parts-express.com/pdf/264-818.pdf


Look like a righteous choice to me. Fairly efficient, pretty wideband , 8 ohms, and only $18 ea.

Those 5 1/4" Peerless ? I know they're only $2.50 ea. , but sometimes you get what you pay for.

. . . AND , the 1.1cu.ft. Vas will require a MUCH larger cabinet.


..........................Blake

Aye. I think the $18 tang bands are the ticket. I shall put them in a transmission line.

Q: If I mass load the cab before the turn in the pipe.... what happens? I read about it but it confused me more. I know the batting should strengthen bass response and increase the theoretical size of the chamberrrrr?
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Old 22nd March 2009, 12:47 AM   #13
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Default the brick

I forgot about this one til now.....


Speaker projects with Tangband W3-817S: Needle and Brick


Always a design I thought would work. A complete cut list included in the photo spread.

Your chosen Tangband should work in it (?)
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Old 22nd March 2009, 07:34 AM   #14
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What if you could get the CHR70s cheaper: llike here?

On the Mark Audio site, there are plans for different enclosures, including a TL. In comparing that design to the Martin King table calculations, the assumption is a speed of sound of ~220m/s. This is 65% of free air, which assumes more stuffing than shown but possible. (The length is dead on.) Assuming a "normal" stuffing (~300m/s), the area of the line should be 148cm2 (vs. 108). It's not that the original is going to sound bad, it's just that the large area should sound more TL-ish.
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Old 22nd March 2009, 07:54 AM   #15
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Quote:
Originally posted by HareBrained
On the Mark Audio site, there are plans for different enclosures, including a TL. In comparing that design to the Martin King table calculations, the assumption is a speed of sound of ~220m/s. This is 65% of free air, which assumes more stuffing than shown but possible. (The length is dead on.) Assuming a "normal" stuffing (~300m/s), the area of the line should be 148cm2 (vs. 108). It's not that the original is going to sound bad, it's just that the large area should sound more TL-ish.
Hold-on... damping does not significantly slow down the speed of sound. Further the TL in the MArk Audio plans is an ML-TL so isn't in Martin's tables. ML-TLs are shorter for the same tuning. You are assumming that the line is tuned to Fs -- a good trick to get more bass, particularily with a small driver like the CHR, is to tune the box higher than Fs. So the shorter line is better explained by it being an ML-TL tuned above Fs. Given that there is essentially no damping in the box already, this makes a lot more sense.

dave
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Old 22nd March 2009, 11:29 AM   #16
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Right. http://www.quarter-wave.com/TLs/Damping_Coefficient.pdf
Note that even with quite high stuffing densities of 0.9lbs ft^3 of dacron (which is higher than required for many ~aperiodic lines) the attenuation is nothing like approaching the kind of massive reduction in the s-o-s suggested above. Only about 18% of the way in fact.

As Dave points out, an MLTL is not a TL in the strict sense of the word. It's a highly resonant line, with some resistive loading to lower Fp; the little damping is present merely to attenuate the higher harmonic resonances while leaving F0 intact.
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Old 22nd March 2009, 02:42 PM   #17
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally posted by raypalmer

Well then #1 is the front-runner...
if you want me to run a driver that is available in your part of the world (since afaik the omnes is only on sale in europe) through the sim, just post the datasheet, I have the file somewhere on my harddrive.

with regards to the placement close to a wall, anything more than an inch is OK, the port is rather small...
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Old 22nd March 2009, 05:06 PM   #18
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HareBrained:

Unfortunately exchange rate coupled with brokerage fees would make them almost as pricey as the solen site.


Henkjan:

Thanks so much! Your datasheet only works on MS Excel I think which left me a little heartbroken the other day... But if you could calculate the TL for this driver that would be awesome!
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Old 22nd March 2009, 05:25 PM   #19
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Quote:
Originally posted by Henkjan
if you want me to run a driver that is available in your part of the world (since afaik the omnes is only on sale in europe) through the sim, just post the datasheet, I have the file somewhere on my harddrive.
What T/S parameters would you try to find a match to, in another driver, for the box to look similar?

In other words, what are the most significant T/S parameters for the size/shape of your simmed box?
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Old 22nd March 2009, 09:28 PM   #20
G is offline G  United States
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Default Re: the brick

Quote:
Originally posted by loninappleton
I forgot about this one til now.....


Speaker projects with Tangband W3-817S: Needle and Brick


Always a design I thought would work. A complete cut list included in the photo spread.

Your chosen Tangband should work in it (?)

Maybe the 3" TB Bamboo driver would work? The 871S is no longer available.
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