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Old 17th July 2003, 09:48 AM   #1
Mentero is offline Mentero  Spain
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Default Another converted to dipole

Hi all,

Find attached the photos of my just finished dipoles.

A lot of inspiration has come from the people in this forum, from the Thunderstone forum and of course from Linkwitz, so thank you all very much.

The full range speaker is a Supravox 215 Signat Bicone and is run full range with a PSE el34 amp.

The input for the two 15" woofers is taken at the full range terminals, with 10k series resistence and 1 uF to ground.
The 15" are cheap locally available speakers with Qts =0.4, 99dB, and 6mm Xmax. They perform very well, and barely move.

And guys, you where right, bass is excellent. And surprising.

Thanks again.

Miguel Garcia.
(Convulsive speaker builder Disease Association. Member)
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Old 17th July 2003, 09:50 AM   #2
Mentero is offline Mentero  Spain
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Another photo
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Old 17th July 2003, 09:52 AM   #3
Mentero is offline Mentero  Spain
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And the last one. Promised
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Old 17th July 2003, 10:12 AM   #4
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Default Beautiful.

Hi Miguel,
The speakers look great. Can you describe the equalisation you have used. I am curious.
Thanks.
Ashok.
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Old 17th July 2003, 11:07 AM   #5
Mentero is offline Mentero  Spain
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Hi Ashok,


I will wait for the drivers to break in, make my measurements and see what eq is needed. Doesn't sound like too much to my ears.

Forgot to mention that the woofers are driven by a 50+50W transistor amp.

The input of this second amp is feeded with the signal taken at the speakers terminals of the full ranger amp throught the RC filter, to compensate for the 6dB dipole rolloff.

Regards
Miguel
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Old 20th July 2003, 02:43 PM   #6
Frode is offline Frode  Norway
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Default Very nice!!!

What's the size of the baffle?

Frode
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Old 20th July 2003, 05:53 PM   #7
Mentero is offline Mentero  Spain
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Hi Frode,

Dimensions are (in centimeter) 123 X 55 X 27 (Max depth)


Regards
Miguel
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Old 20th July 2003, 06:41 PM   #8
Variac is offline Variac  United States
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Well Done! I like the look. Haven't you always wanted huge woofers? Did you glue up the pieces of wood or do they come in big sheets?
My speakers also have a high quality open baffle full range and less expensive pro woofers. (My woofer is in a box though.
Not surprisingly, this seems to be the formula- expensive full range run open baffle. Cheaper pro drivers for bass.

The only down side is that they end up BIG!!
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Old 20th July 2003, 08:56 PM   #9
chops is offline chops  United States
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I like the looks of those a lot! Nice job.
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Old 21st July 2003, 01:09 AM   #10
spa317 is offline spa317  Australia
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Question Dipoles - efficiency??

Miguel,
Do you have any idea what the efficiency of your dipoles would be?
Or, what power is your power amp, and does it play 'effortlessly' without any clipping or stress at higher volumes?
I currently own an 8watt Audio Note Kit One SET amp, and am wondering if this would be enough for your type of speaker. I think I would need something at least 95db efficiency, preferably higher....

I am also very interested in Variac's recent Basszilla speaker he has built, also open baffle driver but woofer in seperate BR enclosure. This uses Fostex 208, but I would imagine the Supravox should be superior....How much does the Supravox cost, and where did you buy it from?

Cheers,

Mark (Australia)
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