Exciting new line of fullrange drivers from Feastrex - Page 98 - diyAudio
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Old 18th July 2008, 12:15 PM   #971
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I thought YOU leaked it, Chris, but I guess not. Oh well, I guess THAT one is out!

Things are going very well here. Update coming soon...(buried in email, dealing with logistics of other life in America).

-Clark
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Old 18th July 2008, 04:31 PM   #972
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Default D9e-I drivers in locally built Feastrex-type enclosure

From Singapore:

Looking good! White things visible through the port are Tozawa Resonators made from Japanese washi paper (different from that used in the drivers), for which a bit of crumpled up newspaper or a paper bag can also be substituted . . .
Click the image to open in full size.

Full frontal view
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Rear view. Both power supply and voice coil polarity can be switched, for a total of four possible combinations.
Click the image to open in full size.

Rear panel open to show Tozawa Resonators
Click the image to open in full size.

Close-up of the "back EMF power recovery module" & switching apparatus, etc.
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Now what I want to know is . . . how does it sound?

-- Chris
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Old 18th July 2008, 04:37 PM   #973
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What does a "Tozawa Resonator" actually do?
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Old 18th July 2008, 05:13 PM   #974
REC1 is offline REC1  United States
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Gee Martin!

It resonates.

ron
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Old 18th July 2008, 07:15 PM   #975
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Paper bag or other container filled with wool (or something like it) placed inside the speaker box:

http://www.troelsgravesen.dk/Ekta_Sugano.htm
Tozawa-Resonator : helps absorb 300Hz and below

(Looks like it might be used to reduce / adjust box volume to me, if the paper is not letting air flow through.)
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Old 18th July 2008, 07:27 PM   #976
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Please forgive me, but I am a little skeptical of this tweak.
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Old 18th July 2008, 07:46 PM   #977
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Hmm. Well, the mention (in the first link) of hanging the device by a string reminds me of something GM mentioned on the BiB thread, namely that a suspended felt pennant in the mouth could (under certain very specific circumstances) act as a "high mass diaphramatic absorber":

http://www.diyaudio.com/forums/showt...99#post1229699

(You have to scroll up to the preceding post for the context.)
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Old 18th July 2008, 11:59 PM   #978
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Skeptical, and well you should be, if anyone claims they are performing minor miracles. In Feastrex's enclosures they have been found to give a small but noticable and welcome improvement in the sound . . .

-- Chris
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Old 19th July 2008, 12:05 AM   #979
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Default Re: D9e-I drivers in locally built Feastrex-type enclosure

Quote:
Originally posted by cdwitmer


Now what I want to know is . . . how does it sound?

-- Chris
Hi Chris,

Thanks for uploading the pictures for me.. I'm not good at loading pics.
I'm still running in the D9e .... sounds excellent.... The D9e moves at lot more air than the D5nf .. so I really like the increase in scale and
image size. The bass also much more realistic... wonderful PRaT.

Mr Teramoto put diodes in the DC power supply.. and he did mention that this helps in giving the spk the electro-mechanical braking effect..
I was playing RR's Dafos very loud and I noticed that the cone didn't seem to be moving... I went closer and I observed that the cone was indeed moving but it just start and stopped faster than the normal permanant magnet spks( sort of like no extra movement or oscillation).. Very interesting cone movement from the field coils.

IMO it's this "electro-mechanical" braking effect that gives the Feastrex Field Coils it's distinct clarity and definition.. actually kind of reminds me of ESL type of sound.
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Old 19th July 2008, 12:12 AM   #980
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Quote:
Originally posted by cdwitmer
Skeptical, and well you should be, if anyone claims they are performing minor miracles. In Feastrex's enclosures they have been found to give a small but noticable and welcome improvement in the sound . . .

-- Chris

Yes, I was skeptical too when I first got hold of these Tozawas... but it sure did improve the tone and tune out the boxyness of the bare cabinets.. In other words ... it really worked in my cabinets with the Feastrex drivers... I now like to use the Tozawas because it's very convenient to use.... I'm not very fond of the trail and error method of using rockwool, cotton or damping material.
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