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Old 13th May 2011, 09:11 PM   #11
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by c2cthomas View Post
...... I don't think ZM is OB kinda guy

.....



ya sure about that .......... ?


All Eminence OB
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Old 14th May 2011, 06:03 AM   #12
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Originally Posted by generg View Post
I think more important is if your Fostex have the same efficiency of the tone tubby around 96/97 db.....


and to get more on topic... I tried F1J and F2J on the baffles too... there was considerably more bass with the tone tubbies, but the overall sound is the best with FET input and SemiSouth of Babelfish J2 .....


I did not try, but I think F3 and F4 would be also good candidates for this open baffle. I did not try F3 up to now ( excuse me Gyuri, he sent me two of precious Lu1014, a parcel for you is on the way).....
Thanks. Lowthers are more efficient than fostexs. Will build and check how they sound. May need to tweak attenuation of tone tubby.
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Old 14th May 2011, 09:42 AM   #13
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Quote:
Originally Posted by anilva View Post
..... May need to tweak attenuation of tone tubby.
no attenuation in bass range

in my book even attenuation in main range kills something

either go to biamp or

use autoformer for taming bass range or

use autoformer to up main range

resistive attenuator in bass range is good just for finding level of attenuation
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Old 14th May 2011, 10:39 AM   #14
generg is offline generg  Germany
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Hi Zen Mod,

nice to see in the link how you helped Yunick 2007 to get a very good low cost open baffle system....

very interesting lecture for me today to read......

All Eminence OB

the residual problem is the deep bass, I do not miss him up to now, to much details to hear new in the midrange and in the deeeeeeeeeeepness of soundstage, but inevitably the day will come i want to hear at least 40 Hz.....
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Old 14th May 2011, 10:57 AM   #15
Zen Mod is offline Zen Mod  Serbia
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send me T/S for TTs

I "made" what I made then purely by experience with Eminence drivers in servicing PA gear and some bits form www ; now it's easier - with MJK sheets

usually - more bass goes either with biamp or simply doubling number of them

NB that deepness is different issue , even if with 2 per side they really go little lower

considering your residence ( small room in Vaterland ) maybe chasing mint Canton Plus B ( or similar ) is worth chasing ....
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Last edited by Zen Mod; 14th May 2011 at 11:00 AM.
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Old 14th May 2011, 11:57 AM   #16
generg is offline generg  Germany
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Quote:
Originally Posted by Zen Mod View Post
send me T/S for TTs

I "made" what I made then purely by experience with Eminence drivers in servicing PA gear and some bits form www ; now it's easier - with MJK sheets

usually - more bass goes either with biamp or simply doubling number of them

NB that deepness is different issue , even if with 2 per side they really go little lower

considering your residence ( small room in Vaterland ) maybe chasing mint Canton Plus B ( or similar ) is worth chasing ....
Hi Zen Mod,


I went to the tone tubby side

and got these two pictures...

the values are a surprise for me not going down very far....
Attached Images
File Type: jpg overview 1.jpg (82.7 KB, 463 views)
File Type: jpg Thiele Small tone tubby 12 8 Ohm.jpg (64.6 KB, 355 views)
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Old 14th May 2011, 12:00 PM   #17
generg is offline generg  Germany
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oh sorry Zen Mod it is the wrong speaker model

I am searching further...

it was the green line
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Last edited by generg; 14th May 2011 at 12:26 PM.
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Old 14th May 2011, 12:28 PM   #18
Zen Mod is offline Zen Mod  Serbia
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interesting graphs

The 12" Alnico Tone Tubby
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Old 14th May 2011, 02:09 PM   #19
generg is offline generg  Germany
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I found it.....
Attached Images
File Type: png Tone Tubby specs 12 8 Ohm.png (113.8 KB, 341 views)
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Old 14th May 2011, 02:16 PM   #20
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saved in //Generg/OB/

considering PM6A - 8 Ohms , Al coil ?

PM6A Drive Unit
Theile Small Parameters for PM6A with 8 ohm Aluminium Voice Coil DC Resistance of Voice Coil Re 7.4 ohms
Free Air Resonance Fo 61.980 Hz
Emission Piston Area Sd 0.021M
Equivalent Volume Suspension Vas 47.192 Ltrs
Suspension Compliance Cms 753.6 u M/N
Mass of Cone Mmd 7.0 g
Mass of Moving Parts Mms 8.75 g
Force Factor Bl 7.27 T-M
Mechanical Q Factor Qms 1.578
Electrical Q Factor Qes 0.477
Total Q Factor Qts 0.366
Voice Coil Inductance @ 1 kHz Le 148.2 uH
Reference Efficiency No 2.278%
Sound Pressure Level SPL 95.593 Db


what I also need is :

dimensions of OB and exact position of drivers
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Last edited by Zen Mod; 14th May 2011 at 02:19 PM.
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