Next project - TQWT for EV SP12b

fin1bxn · 29th July 2007, 04:01 PM

Since my Karlson pipe cabinet for these sucked (no bass bellow 150,but had great imaging and eff), I want to build a TQWT. I used the calculator to deturmin dimentions and need tips for dampling / stuffing. I'm going to use 3/4 birch, unless someone thinks MDF is better.

Any tips?

Thanks
Bob

Scottmoose · 29th July 2007, 04:05 PM

Which calculator? If it's the Rutter excel sheet based on Weems's articles, you might want to hang fire as you won't get an optimised enclosure out of it. Birch ply is the stuff to use, unless you're feeling in a luxurious mood & can afford apple ply.

fin1bxn · 29th July 2007, 04:09 PM

Here are the driver spec's

Re=6.7
Sd=535 cm2
Bl=8.76 N/A
Vas=167 liters
Cms=411 uM/N
Fs=45
Qms=5.9
Qes=0.75
Qts=0.665
Pe=65Watts
Xmax=3.3 mm
Eff=94.96 dB

Dimentions given were 45" high 14" wide 19" deep with a 34" inch from 7" bottom opening 3/4" in

I welcome any other cabinet specs
Thanks

Scottmoose · 29th July 2007, 09:36 PM

The driver specs don't really suit a resonant cabinet IMO -Q & Vas are too high. Unfortunately my main PC is currently out of comission while some building work is going on in the house so I can't access most of my software properly. FWIW though, I suspect a sealed or aperiodic box is probably the best bet for these untis without going to a very large box. Attached is a rough sim. of the response you can expect from the aforementioned TQWT though.

fin1bxn · 4th August 2007, 01:24 PM

I'm going to go with the folded horn made from 3/4" birch, unless someone has a better cabinet design for these....Help is requested.

Thanks
Bob

Scottmoose · 4th August 2007, 01:27 PM

Which folded horn?

fin1bxn · 4th August 2007, 03:36 PM

Here is the link to the type

http://melhuish.org/audio/DIYTQ3.html

GM · 4th August 2007, 04:47 PM

I calc'd a BIB, but at ~71.5 ft^3, I guess it's not a contender........

GM · 4th August 2007, 04:52 PM

Hmm, even a simple max flat impedance TL weighs in at a hefty ~13 ft^3.........

fin1bxn · 4th August 2007, 06:05 PM

Maybe people are right and I should do a Open baffle.
Seems they need room to breath.

Using the WINIS software i came up with a 24^box 37 wide 58 high and 22 deep and that vented, Sealed is even bigger...BUt they show great flat response down to 30hz

I wonder what they made these drivers for. I know with the Corner Carlso cabinets they imaged and had gret midrange, just no bass.....Maybe I should also try a regular Karlson cab

29th July 2007, 04:01 PM	#1
fin1bxn diyAudio Member Join Date: Apr 2006 Location: NJ	Next project - TQWT for EV SP12b Since my Karlson pipe cabinet for these sucked (no bass bellow 150,but had great imaging and eff), I want to build a TQWT. I used the calculator to deturmin dimentions and need tips for dampling / stuffing. I'm going to use 3/4 birch, unless someone thinks MDF is better. Any tips? Thanks Bob __________________ RN

29th July 2007, 04:09 PM	#3
fin1bxn diyAudio Member Join Date: Apr 2006 Location: NJ	it was the rutter Here are the driver spec's Re=6.7 Sd=535 cm2 Bl=8.76 N/A Vas=167 liters Cms=411 uM/N Fs=45 Qms=5.9 Qes=0.75 Qts=0.665 Pe=65Watts Xmax=3.3 mm Eff=94.96 dB Dimentions given were 45" high 14" wide 19" deep with a 34" inch from 7" bottom opening 3/4" in I welcome any other cabinet specs Thanks __________________ RN

4th August 2007, 01:24 PM	#5
fin1bxn diyAudio Member Join Date: Apr 2006 Location: NJ	I'm ready to start cutting Wood -Sugestions I'm going to go with the folded horn made from 3/4" birch, unless someone has a better cabinet design for these....Help is requested. Thanks Bob __________________ RN

4th August 2007, 03:36 PM	#7
fin1bxn diyAudio Member Join Date: Apr 2006 Location: NJ	one of these Here is the link to the type http://melhuish.org/audio/DIYTQ3.html __________________ RN

4th August 2007, 04:47 PM	#8
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	I calc'd a BIB, but at ~71.5 ft^3, I guess it's not a contender........ __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.


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29th July 2007, 04:05 PM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Which calculator? If it's the Rutter excel sheet based on Weems's articles, you might want to hang fire as you won't get an optimised enclosure out of it. Birch ply is the stuff to use, unless you're feeling in a luxurious mood & can afford apple ply.

4th August 2007, 01:27 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Which folded horn?

4th August 2007, 04:52 PM	#9
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Hmm, even a simple max flat impedance TL weighs in at a hefty ~13 ft^3......... __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

4th August 2007, 06:05 PM	#10
fin1bxn diyAudio Member Join Date: Apr 2006 Location: NJ	I just ran WinIS Maybe people are right and I should do a Open baffle. Seems they need room to breath. Using the WINIS software i came up with a 24^box 37 wide 58 high and 22 deep and that vented, Sealed is even bigger...BUt they show great flat response down to 30hz I wonder what they made these drivers for. I know with the Corner Carlso cabinets they imaged and had gret midrange, just no bass.....Maybe I should also try a regular Karlson cab __________________ RN

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