Who Has Actually Built/Heard A DTQWT Or An TQWT

2MuchRiceMakesMeSick · 7th November 2011, 07:53 PM

I am curious if anyone actually built or heard the DTQWT or a TQWT? I read a few threads on here with people kicking around the idea but no reviews except a quote from the guy that made them.

bear · 8th November 2011, 12:03 AM

I heard MJK's own TQWT that used a Fostex driver at the time (iirc) and was quite impressed with the presentation of the bass and the overall sound. Of course the total SPL and the HF is limited by the small Fostex driver, but with small ensemble pieces like jazz or chamber music it was quite nice, better than one might expect. Quite refined. Stand-up bass was rather exceptionally good as I recall.

How does that stack up against some other methods and other systems?
That depends on your personal tastes, needs and budget, also the footprint you are willing to have in ur space. The max SPL will depend on the driver and amp power.

Hope that helps in some way.

_-_-bear

DrDyna · 8th November 2011, 12:06 AM

I built mine at B's suggestion and I love them, especially at low levels, where I'd lose definition on my old BR subs, these just...breathe...

Speedskater · 8th November 2011, 12:16 AM

Just what is a "DTQWT" or for that matter a "TQWT" ?

pieter t · 8th November 2011, 12:31 AM

Double Tapped Quarter Wave Tube....

DrDyna · 8th November 2011, 12:32 AM

Quote:

Originally Posted by Speedskater

Just what is a "DTQWT" or for that matter a "TQWT" ?

TQWT is Tapered quarter wave tube, or T-TQWT is taped, tapered quarter wave tube. I've seen it called Voight Pipe as well.

Quarter Wavelength Loudspeaker Design Gallery

pieter t · 8th November 2011, 12:35 AM

Oh yes, tapered instead of tapped...must be my transformer brain....

DrDyna · 8th November 2011, 12:36 AM

Quote:

Originally Posted by pieter t

Oh yes, tapered instead of tapped...must be my transformer brain....

You might be correct, I have dyslexia when it comes to acronyms sometimes and I didn't check.

HeatMiser · 8th November 2011, 12:38 AM

I'm pretty sure the OP is asking about Troels Gravesens' designs.

DTQWT-mkII

TQWT-

Apologies if I got that wrong.

DrDyna · 8th November 2011, 12:41 AM

Quote:

Originally Posted by HeatMiser

I'm pretty sure the OP is asking about Troels Gravesens' designs.

DTQWT-mkII

TQWT-

Apologies if I got that wrong.

I can't say that I've heard Troels speakers themselves, but the design is sound and has it's merits. I'm sure Troels are every bit what he describes them to be.

7th November 2011, 07:53 PM	#1
2MuchRiceMakesMeSick diyAudio Member Join Date: Oct 2011	Who Has Actually Built/Heard A DTQWT Or An TQWT I am curious if anyone actually built or heard the DTQWT or a TQWT? I read a few threads on here with people kicking around the idea but no reviews except a quote from the guy that made them.

8th November 2011, 12:03 AM	#2
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	I heard MJK's own TQWT that used a Fostex driver at the time (iirc) and was quite impressed with the presentation of the bass and the overall sound. Of course the total SPL and the HF is limited by the small Fostex driver, but with small ensemble pieces like jazz or chamber music it was quite nice, better than one might expect. Quite refined. Stand-up bass was rather exceptionally good as I recall. How does that stack up against some other methods and other systems? That depends on your personal tastes, needs and budget, also the footprint you are willing to have in ur space. The max SPL will depend on the driver and amp power. Hope that helps in some way. _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

8th November 2011, 12:16 AM	#4
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	Just what is a "DTQWT" or for that matter a "TQWT" ? __________________ Kevin

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8th November 2011, 12:06 AM	#3
DrDyna diyAudio Member Join Date: May 2007 Blog Entries: 3	I built mine at B's suggestion and I love them, especially at low levels, where I'd lose definition on my old BR subs, these just...breathe...

8th November 2011, 12:31 AM	#5
pieter t diyAudio Member Join Date: Apr 2009	Double Tapped Quarter Wave Tube....

8th November 2011, 12:35 AM	#7
pieter t diyAudio Member Join Date: Apr 2009	Oh yes, tapered instead of tapped...must be my transformer brain....

8th November 2011, 12:38 AM	#9
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	I'm pretty sure the OP is asking about Troels Gravesens' designs. DTQWT-mkII TQWT- Apologies if I got that wrong.

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