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-   -   BetsyK ML-TL and TQWT (http://www.diyaudio.com/forums/wild-burro-audio/182745-betsyk-ml-tl-tqwt.html)

nesha 8th February 2011 03:22 PM

BetsyK ML-TL and TQWT
 
2 Attachment(s)
I was terrible lazy and innert, and instead of apology let's go on with projects...
I had the same thread in diyaudio.rs , and ZM and couple of friends moddeled ML-TL, and TQWT for me. Strangely , wifey voted for toller and bigger ML-TL...

nesha 8th February 2011 03:29 PM

So,question is : can I change (slightly) depth of the box , provided top and bottom remains the same (sq in)?

pjanda1 8th February 2011 03:51 PM

That is a nice looking alignment! Given that the line is tapered, changing the depth will change the expansion a bit, if I'm not mistaken. But assuming the change isn't huge, I don't expect that it would make a big difference in the response. Maybe somebody that knows more will chime in. Also, you may have it all planned out, but given the width, a little bracing would be a good idea.

I really like the look of that cabinet. I'm personally amused by how similar the dimensions are to my current open baffle setup! I look forward to seeing your build!

Paul
Wild Burro Audio Labs - DIY Full Range Speakers

nesha 9th February 2011 11:10 AM

3 Attachment(s)
A friend also did some mesurement (with 'fresh", unbroken-in driver) and this is the result, litle different from published specc. Great guys on diyaudio.rs made tqwt project, with new speccifications. I've been told that mesured Fs would eventualy go down with beaking-in ... Mabye other parameters would change?

Vas test completed: Tue Jul 13 14:10:33 2010
Vas drive current 2393.92 uA
B k, 3 novcica
;------------------------------------------------------------------
Revc = 5.8235 ohms
Fms = 58.1394 Hz
Zmax = 34.8162 ohms
Qes = 0.6529
Qms = 3.2507
Qts = 0.5437
Le = 0.4044 mH (at 1 kHz)
Diam = 165.0000 mm ( 6.4961 in )
Sd =21382.4660 mm^2( 33.1429 in^2)
Vas = 48.9494 L ( 1.7286 ft^3)
BL = 5.6918 N/A
Mms = 9.9433 g
Cms = 753.6449 uM/N
Kms = 1326.8848 N/M
Rms = 1.1174 R mechanical
Efficiency = 1.3844 %
Sensitivity= 93.4305 dB @1W/1m
Sensitivity= 94.8095 dB @2.83Vrms/1m
;------------------------------------------------------------------
; When testing drivers with an up/down radiation (cone motion)
; enough weight should be used to get a decent resonance change
; without significantly altering the drivers suspension zero point.
; A typically good configuration is when Fs/Fsa=1.25.
; Horizontally mounted drivers are less susceptable but require
; a clay or soft caulk mass. The following may be of help
;------------------------------------------------------------------
Fms= 58.1394 Mms = 9.9433 g
Fsa= 38.2079 Mms+Ma= 23.0233 g
Fs/Fsa = 1.5217
Ideal Test Mass = 5.5931 g
Test Mass used = 13.0800 g
Missed ideal by = 7.4869 g (too heavy)
Nickels used = 2.6160
;--- Impedance Fitting Constants ---
Krm 977.166E-06 ohms Freq dependent resistance
Erm 814.437E-03 Rem=Krm*(2*pi*f)^Erm
Kxm 14.118E-03 Henries Freq dependent reactance
Exm 616.299E-03 Xem=Kxm*(2*pi*f)^Exm, Lem=Kxm*(2*pi*f)^(Exm-1)

pjanda1 9th February 2011 03:31 PM

Quote:

Originally Posted by nesha (Post 2462477)
A friend also did some mesurement (with 'fresh", unbroken-in driver) and this is the result, litle different from published specc. Great guys on diyaudio.rs made tqwt project, with new speccifications. I've been told that mesured Fs would eventualy go down with beaking-in ... Mabye other parameters would change?

Yup, VAS should go up, Qts down. I don't know that it'll make a giant difference to the box tuning, but were I you, I'd model with the published specs before cutting wood. Or, break them in with some low frequency sine waves (don't break them, of course) and remeasure. For most of us that don't build a box a week, its good to get them right!

Looking good though. We're you originally thinking Onken? These are going to be much easier to move!

Paul
Wild Burro Audio Labs - DIY Full Range Speakers

nesha 9th February 2011 06:58 PM

2 Attachment(s)
Thaks PJ. I've got tqwt simm with published spec as well, slightly bigger.Compact and nice,I thought, but my better half sead nope, go for pyramide...

nesha 3rd February 2012 06:05 PM

5 Attachment(s)
I finaly started cutting and glueing.One side panel will stay unglued for change in damping of the box, and in few months, I'll glue 10mm plywood
from outside, for aestetics an dampening of the panels.

pjanda1 12th February 2012 04:35 PM

Those look great!

Paul
Wild Burro Audio Labs - DIY Full Range Speakers

nesha 5th April 2012 11:28 PM

And - ... it works! The box is glued with Titebond, one side panel just screwed, inside few sheets of sponge (temporarely, till I get syntetic wool) ... but - it works!!! I mean, there is bass, without any filter. My room is 5x4m (15x12ft), and boxes are about 1 foot from the wall, and 2m between them. I'm pleased with sound, there is no rough peaks, Wild Burro BetsyK is easely better than my old Heybrook HB1. I'll post more pistures ind listening impressions. I'm thinking now what wire to use and how to finish boxes.

nesha 6th April 2012 11:18 AM

2 Attachment(s)
Sorry about bad pictures , I don't have camera right now, an I'll post some "proper" pictures soon...


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