Transmission line box, is this a ok design? - diyAudio
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Old 3rd August 2009, 11:45 PM   #1
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Default Transmission line box, is this a ok design?

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The driver is a hertz energy 10'' being fed 200wrms ish

Will be used for films and some music, i have a suspicion i may be ''tuned'' a little low, where would be a good point to ''tune'' to?

Is tapering it in that way ok? or would a gradual taper be better?

Sam.
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Old 4th August 2009, 04:02 AM   #2
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The driver needs to be offset at ~ 1/3rd the length of the pipe;
a gradual taper is better (fewer standing waves);
to get the length try the calculator posted in post 13 of this thread:
need help with TL calculations
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Old 4th August 2009, 04:50 AM   #3
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A couple things.

1/ it should not be tuned below Fs
2/ offset is approximately 1/3... optimum depends on taper
3/ i suspect yours is too long with eo small a cross section.

What driver?

dave
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Old 4th August 2009, 11:03 AM   #4
bjorno is offline bjorno  Sweden
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Hi,

Agree 100% with planet10. For this driver and your CSA it would be better if choosing a length between 2 and 3 m and IMO best if designing a T-TQWT. See picture 1(1)

b
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Old 4th August 2009, 02:00 PM   #5
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Ok, what would you recomend i use as my length, and ratio of taper?

the Fs of the driver is 27hz

Sam.
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Old 4th August 2009, 02:00 PM   #6
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Wow bjorno! thank you! so would that design with say a 2.5m lenth and those ratios be a good starting point then? those responce curves look good to me javascript:smilie('')
confused
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Old 4th August 2009, 04:05 PM   #7
GM is offline GM  United States
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Great work as always Bjorno!

FYI, I uploaded this driver's WinISD file for anyone wanting to try more mundane loadings: http://www.hometheatershack.com/foru...tz-es250-4.wdr

GM
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Old 4th August 2009, 07:30 PM   #8
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Thanks guys, it will be built over the weekend.

should i place the driver at the 1/3 of the length?
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Old 6th August 2009, 06:53 PM   #9
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Well its done! and oh my!

Its not the loudest, but omg does it play flat! the into to put on - young jeezy is insane

it goes from 40-35-30-24 hz and all of them are hit with aurthority and subtleness, the sound on some tracks it astounding, thank you to all envolved and everyone who helped

should i wad/stuff it?
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Old 6th August 2009, 08:02 PM   #10
GM is offline GM  United States
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I'm not clear on what you actually built, but it depends, though if you're pleased with it as is, probably no point in 'fixing' what isn't 'broke'.

GM
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