Transmission line box, is this a ok design?

spanerman · 3rd August 2009, 11:45 PM

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.

PeteMcK · 4th August 2009, 04:02 AM

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

planet10 · 4th August 2009, 04:50 AM

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

bjorno · 4th August 2009, 11:03 AM

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

spanerman · 4th August 2009, 02:00 PM

Ok, what would you recomend i use as my length, and ratio of taper?

the Fs of the driver is 27hz

Sam.

spanerman · 4th August 2009, 02:00 PM

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

GM · 4th August 2009, 04:05 PM

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

spanerman · 4th August 2009, 07:30 PM

Thanks guys, it will be built over the weekend.

should i place the driver at the 1/3 of the length?

spanerman · 6th August 2009, 06:53 PM

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?

GM · 6th August 2009, 08:02 PM

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

3rd August 2009, 11:45 PM	#1
spanerman diyAudio Member Join Date: Aug 2009	Transmission line box, is this a ok design? 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.

4th August 2009, 04:02 AM	#2
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	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 __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

4th August 2009, 04:50 AM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	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 __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

4th August 2009, 02:00 PM	#6
spanerman diyAudio Member Join Date: Aug 2009	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

4th August 2009, 04:05 PM	#7
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	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 __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.


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4th August 2009, 07:30 PM	#8
spanerman diyAudio Member Join Date: Aug 2009	Thanks guys, it will be built over the weekend. should i place the driver at the 1/3 of the length?

6th August 2009, 06:53 PM	#9
spanerman diyAudio Member Join Date: Aug 2009	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?

6th August 2009, 08:02 PM	#10
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	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 __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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