scottmoose and gm-humble question

Zen Mod · 27th March 2007, 08:09 AM

I have MJK's free sheets,but I'm nowhere near routine you two obviously have with this......
so -can I direct your attention to one old thread :

http://www.diyaudio.com/forums/showt...737#post919737

anyway, here is pasted txt :

*********
Anyone willing to solve this case ?
I need measures for tall (not folded) TQWT
I know that overall dimensions are not critical,but vent certainly is;

This is what I measure ,using procedure from JBL Speaker Shop.
Unfortunately,I don't have way to measure Xmax,if needed

TIA

old Scan Speak Alnico driver

21W38

Fs=64Hz
Qms=3.054
Qmc=3.308
vas=20.6L
Cms=0.2508mm/N
Mms=24.66gr
Rms=3.246kg/s
Sd=240.52cm^2
Qes=1.155
Re=3.7E
Bl=5.6537
Qts=0.83
Eff=0.4509%
Spl=88.74db

*******************

willing to spend 5 min on that?
I really don't ask for more.............mebbe just for one 8" FR .......

bjorno · 27th March 2007, 10:37 AM

Quote:

Anyone willing to solve this case ?

In the ballpark?

b

1(4)

bjorno · 27th March 2007, 10:38 AM

2(4)

bjorno · 27th March 2007, 10:40 AM

3(4)

bjorno · 27th March 2007, 10:41 AM

4(4)

Scottmoose · 27th March 2007, 10:43 AM

About as good as you're likely to get. I ended up doing something similar. You'll get too much midbass gain with TQWT. You could damp it down of course, but why bother when there's a better alignment. And it's still a tall, slim cabinet.

Zen Mod · 27th March 2007, 12:09 PM

tnx boyz............

just just just another one.........?

TQWT or something ?

old ,ancient Iskra 8"

F3=57Hz
Cmm=1,3928x10^-3m/N
S=0,0292552m^2
Vas=166.8995L
Bl=3,563Tm
Qms=10,3636
Mmm=2,7669x10^-3kg
Rmm=0,1934 Ns/mRez=3,4E
Lez=0,217mH
Qes=0,537
Qts=0,51

TIA

Zen Mod · 27th March 2007, 01:43 PM

btw-this is my result for 21W38 with JBL proggie

27th March 2007, 08:09 AM	#1
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	scottmoose and gm-humble question I have MJK's free sheets,but I'm nowhere near routine you two obviously have with this...... so -can I direct your attention to one old thread : http://www.diyaudio.com/forums/showt...737#post919737 anyway, here is pasted txt : ******* Anyone willing to solve this case ? I need measures for tall (not folded) TQWT I know that overall dimensions are not critical,but vent certainly is; This is what I measure ,using procedure from JBL Speaker Shop. Unfortunately,I don't have way to measure Xmax,if needed TIA old Scan Speak Alnico driver 21W38 Fs=64Hz Qms=3.054 Qmc=3.308 vas=20.6L Cms=0.2508mm/N Mms=24.66gr Rms=3.246kg/s Sd=240.52cm^2 Qes=1.155 Re=3.7E Bl=5.6537 Qts=0.83 Eff=0.4509% Spl=88.74db *************** willing to spend 5 min on that? I really don't ask for more.............mebbe just for one 8" FR ....... __________________ my Papa is smarter than your Nelson ! tnx to clean** thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

27th March 2007, 12:09 PM	#7
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	tnx boyz............ just just just another one.........? TQWT or something ? old ,ancient Iskra 8" F3=57Hz Cmm=1,3928x10^-3m/N S=0,0292552m^2 Vas=166.8995L Bl=3,563Tm Qms=10,3636 Mmm=2,7669x10^-3kg Rmm=0,1934 Ns/mRez=3,4E Lez=0,217mH Qes=0,537 Qts=0,51 TIA __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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27th March 2007, 10:43 AM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	About as good as you're likely to get. I ended up doing something similar. You'll get too much midbass gain with TQWT. You could damp it down of course, but why bother when there's a better alignment. And it's still a tall, slim cabinet.

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