Suggestions for the TB W8-1363SA small box sub? - Page 3

sreten · 7th February 2007, 05:21 PM

Hi,

What shape box of ~ 10L takes a 15" pipe ?

Cheapy Passive Sub?

Quote:

Hi,

32ft/s = ~ 10m/s.

in WinISD Pro 10L box tuned to 38Hz, 34mm O by 160mm long port :

for 150W I get max port velocity = 96m/s (320ft/s) at 34Hz.

To peak at 11m/s you need a port 10cm in diameter and 1.5m long.

/sreten.

/sreten.

audiosteve · 7th February 2007, 05:34 PM

Sreten,

I obviously don't know my may around Winisd yet. Your comments shed a lot of light on the issue for me. A passive radiator it is. The only problem with that is I can't find a commercially available unit that yields a flat response below 50Hz. The 10" from PartsExpress gets close, still a bit of a bump and an F3 at around 45Hz. The 8" looks great but stops at 50 Hz and has a lower Xmax than the driver. No great solution with either.

What I probably need to do is use the flat PR and then add some boost. Stupid me. I already ordered the amp and it doesn't have any boost available. I jumped too quick on this project w/o doing all the modeling I should have up front. javascript:smilie('

')
dead

Thanks,
Steve

GM · 9th February 2007, 12:17 AM

Greets!

Sorry about that, it seemed reasonable to assume that someone who's been around awhile would have seen/read the many dozens of threads across the forums about TLs, MLTLs, Voigt pipes, how to use MJK's MathCad simming worksheets, etc., not to mention the humongous Bigger is Better (BIB) thread and its various spin-offs.

Anyway, I answered your primary Q and you can do forum searches to get 'up to speed' with all the rest if you're interested enough.

GM

audiosteve · 9th February 2007, 05:11 AM

A reasonable assumption about me being around for a while.
But although I registered for this site a few years back I haven't checked into the loudspeaker threads at all. And my past speaker building never took me into much in the way of low frequency design. I've always just done done flat sealed boxes. I am really quite the newbie with respect to LF design. I'll do a little more poking around on my own before asking any more questions that I now realize are pretty elementary to the rest of this forum. Thanks for your feedback.

7th February 2007, 05:34 PM	#22
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	Sreten, I obviously don't know my may around Winisd yet. Your comments shed a lot of light on the issue for me. A passive radiator it is. The only problem with that is I can't find a commercially available unit that yields a flat response below 50Hz. The 10" from PartsExpress gets close, still a bit of a bump and an F3 at around 45Hz. The 8" looks great but stops at 50 Hz and has a lower Xmax than the driver. No great solution with either. What I probably need to do is use the flat PR and then add some boost. Stupid me. I already ordered the amp and it doesn't have any boost available. I jumped too quick on this project w/o doing all the modeling I should have up front. javascript:smilie('') dead Thanks, Steve

9th February 2007, 12:17 AM	#23
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! Sorry about that, it seemed reasonable to assume that someone who's been around awhile would have seen/read the many dozens of threads across the forums about TLs, MLTLs, Voigt pipes, how to use MJK's MathCad simming worksheets, etc., not to mention the humongous Bigger is Better (BIB) thread and its various spin-offs. Anyway, I answered your primary Q and you can do forum searches to get 'up to speed' with all the rest if you're interested enough. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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9th February 2007, 05:11 AM	#24
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	A reasonable assumption about me being around for a while. But although I registered for this site a few years back I haven't checked into the loudspeaker threads at all. And my past speaker building never took me into much in the way of low frequency design. I've always just done done flat sealed boxes. I am really quite the newbie with respect to LF design. I'll do a little more poking around on my own before asking any more questions that I now realize are pretty elementary to the rest of this forum. Thanks for your feedback.

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