Considerations for building a TWW 2-Way System

plamalice · 1st December 2006, 02:44 PM

Hi there,

I've been looking all over for information/documentation on building a 2-Way speaker with 2 woofers. (TWW Configuration)

How will the xover network be affected (other than the load of course), what will become of the Re and all other drive parameters when hooked in series/parrallel... What about the dB/W...

I've found a lot of designs incorporating 2 woofers in either a D'appolito config or TWW but haven't found any pertinent documentation on the subject.

Anyone know of a site/resource where i might find such information ?

Thanks a lot

sreten · 1st December 2006, 03:02 PM

Hi,

try looking for information on 2.5 way speakers.

/sreten.

69stingray · 4th December 2006, 11:53 PM

Here is one:

http://www.partsexpress.com/projects...e/ubt/ubt.html

Here is another:

http://www.zaphaudio.com/Waveguidetmm.html

s7horton · 5th December 2006, 12:37 PM

You could use a design similar to mine (2 1/2 way) and use only one enclosure instead of two. (one sealed for mid, and one ported for woofer) It'd be cheaper as well since you wouldn' t need the crossover on the bottom woofer.

http://www.htguide.com/forum/showthread.php4?t=23211

sreten · 5th December 2006, 01:40 PM

Quote:

Originally posted by s7horton
You could use a design similar to mine (2 1/2 way) and use only one enclosure instead of two. (one sealed for mid, and one ported for woofer) It'd be cheaper as well since you wouldn' t need the crossover on the bottom woofer.

Hi, what your saying doesn't make any sense,

/sreten.

s7horton · 7th December 2006, 12:09 PM

If you viewed the thread, you would notice there is an upper enclosure for the midbass and tweeter and a separate chamber, ported, for the woofer. WIth a two-way, I would put everything in the same chamber, ported.

My crossover is made of three components. One for the tweeter, one for the mid and one for the .5 woofer. If you made a two way, you wouldn't need the .5 portion of the crossover.

Make sense?

sreten · 7th December 2006, 01:27 PM

Quote:

Originally posted by s7horton
If you viewed the thread, you would notice there is an upper enclosure for the midbass and tweeter and a separate chamber, ported, for the woofer. WIth a two-way, I would put everything in the same chamber, ported.

My crossover is made of three components. One for the tweeter, one for the mid and one for the .5 woofer. If you made a two way, you wouldn't need the .5 portion of the crossover.

Make sense?

Hi,

More sense. You don't need separate chambers for a 2.5 way. Its
a design choice. You can also have separate chambers for a 2-way.

/sreten.

Raoul · 7th December 2006, 04:51 PM

Hi s7horton,

Zaph actually did some tests that imply seperate enclosures for a 2.5 way may not be necessary:

http://zaphaudio.com/commonenclosuretest.html

Not saying that building two enclosures is a bad thing, but The results are pretty interesting.

s7horton · 8th December 2006, 12:17 PM

I don't disagree. It's not required. But I like the sound I get with a larger, ported chamber for the bottom end. It's tuned for that driver.

TurboFC3S · 8th December 2006, 04:04 PM

My recent build is a 2.5 way with GR M-165x drivers ... one cab I did both woofers in a 1.65 cu/ft vented - the other was one driver in a .6 sealed, the other in a 1 cu/ft vented.

The 1.6 cu/ft vented version produced significantly more bass. I did quick measurements with my ECM8000 and Speaker Workshop ... but bass measurements are somewhat inconclusive. I trusted my ears more than the measurement, and they told me the version with both drivers in a shared larger enclosure was the way to go.

That's just one example though, based on my space and cabinet size limitations.

1st December 2006, 02:44 PM	#1
plamalice diyAudio Member Join Date: Dec 2006	Considerations for building a TWW 2-Way System Hi there, I've been looking all over for information/documentation on building a 2-Way speaker with 2 woofers. (TWW Configuration) How will the xover network be affected (other than the load of course), what will become of the Re and all other drive parameters when hooked in series/parrallel... What about the dB/W... I've found a lot of designs incorporating 2 woofers in either a D'appolito config or TWW but haven't found any pertinent documentation on the subject. Anyone know of a site/resource where i might find such information ? Thanks a lot

4th December 2006, 11:53 PM	#3
69stingray diyAudio Member Join Date: Apr 2005 Location: NH	Here is one: http://www.partsexpress.com/projects...e/ubt/ubt.html Here is another: http://www.zaphaudio.com/Waveguidetmm.html __________________ Audio DIY Page FOLLOWMY529.COM - Subscribe and follow the performance of my daughter's 529 College Saving Account.

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1st December 2006, 03:02 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, try looking for information on 2.5 way speakers. /sreten.

5th December 2006, 12:37 PM	#4
s7horton diyAudio Member Join Date: Oct 2006	You could use a design similar to mine (2 1/2 way) and use only one enclosure instead of two. (one sealed for mid, and one ported for woofer) It'd be cheaper as well since you wouldn' t need the crossover on the bottom woofer. http://www.htguide.com/forum/showthread.php4?t=23211

7th December 2006, 12:09 PM	#6
s7horton diyAudio Member Join Date: Oct 2006	If you viewed the thread, you would notice there is an upper enclosure for the midbass and tweeter and a separate chamber, ported, for the woofer. WIth a two-way, I would put everything in the same chamber, ported. My crossover is made of three components. One for the tweeter, one for the mid and one for the .5 woofer. If you made a two way, you wouldn't need the .5 portion of the crossover. Make sense?

7th December 2006, 04:51 PM	#8
Raoul diyAudio Member Join Date: Feb 2003 Location: OR	Hi s7horton, Zaph actually did some tests that imply seperate enclosures for a 2.5 way may not be necessary: http://zaphaudio.com/commonenclosuretest.html Not saying that building two enclosures is a bad thing, but The results are pretty interesting.

8th December 2006, 12:17 PM	#9
s7horton diyAudio Member Join Date: Oct 2006	I don't disagree. It's not required. But I like the sound I get with a larger, ported chamber for the bottom end. It's tuned for that driver.

8th December 2006, 04:04 PM	#10
TurboFC3S diyAudio Member Join Date: Aug 2006	My recent build is a 2.5 way with GR M-165x drivers ... one cab I did both woofers in a 1.65 cu/ft vented - the other was one driver in a .6 sealed, the other in a 1 cu/ft vented. The 1.6 cu/ft vented version produced significantly more bass. I did quick measurements with my ECM8000 and Speaker Workshop ... but bass measurements are somewhat inconclusive. I trusted my ears more than the measurement, and they told me the version with both drivers in a shared larger enclosure was the way to go. That's just one example though, based on my space and cabinet size limitations.

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