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Old 5th September 2003, 08:20 PM   #1
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Default Perspex Quasar

After far too long, I have finally finished construction of my transparent Open Baffle speakers. I've just bolted the drive units in and taken a couple of pictures. I'll wire them up tomorrow.

Here are the piccies,
Front View

Back View

ciao

James
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Old 5th September 2003, 08:31 PM   #2
octopus is offline octopus  England
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That's one way to say speakers look better without grilles!

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Old 5th September 2003, 08:36 PM   #3
Bose(o) is offline Bose(o)  Canada
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Wow! Terrific looking speakers!

Perhaps, this is another form representing function? Transparent and CLEAR sound built as a Transparent and CLEAR enclosure. Great job! It looks like Plexi or just plain old glass to me(?)...and a Fostex driver? with some other bass driver. Are u using active cross-overs? No cross-overs?
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Old 5th September 2003, 08:37 PM   #4
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James

They look absolutely sensational. What are the drive units? Is the full range AER? Any crossovers? And the sound?
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Old 5th September 2003, 09:07 PM   #5
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Many thanks for the nice comments

They drive units are AER BD1 full range at top and Supravox GMF 285 at the bottom.

The supravox is used to provide baffle step correction to the AER as the panel starts to introduce cancelation so the AER is run basically full range and the Supravox is 18dB down by 400Hz at first order rate.

The components are available from BD Designs, I designed the baffle and Bert adopted it as it was close to his ideas for an OB, he then worked out the filter values and optimise the AER drivers for this application. My wife refused to have speakers this big in the house until I said I would make transparent ones. These have high WAF, my wife gave then 9.5 out of 10!!!

Getting the baffles built was a swine of a job. Every little mark and join has to very carefully polished smooth or it shows...

I can't wait to finish the wiring tomorrow and listen to them.

ciao

James
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Old 5th September 2003, 09:39 PM   #6
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Just curious if you first built an mdf mock-up or just jumped into the deep end with the acrylic Did you do all the work yourself?
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Old 5th September 2003, 09:44 PM   #7
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Default Bullet Proof?

They look to be bullet proof too.

What kind of wire will you use? I expect something intersting since it shows...
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Old 5th September 2003, 09:58 PM   #8
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Hi Peter,

I made a mock up in heavy cardboard from some large boxes I had. These proved the concept. The design was worked out in theory so I was confident that it would work. Bert built an MDF version to help fine tune the filter components although the final values are very close to the calculated optimum value.

I have tried for nearly a year to get these made to my design and in the end did about half the work myself. I had a local plexiglass expert make the bends in the sheets in his workshop and he cut the large holes. I did the rest and the hard hand finishing...God that was time consuming! But worth it!

Quote:
What kind of wire will you use?
I have a really nice OFC wire in about 18 guage with a very pale electric blue translucent insulation. If I dress the wires properly then it will look really nice. I have found this wire to sound nice and neutral.

ciao

James
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Old 5th September 2003, 10:17 PM   #9
VEC7OR is offline VEC7OR  Lithuania
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Wow, nice !!!!!!
Cheers, keep up with good work!
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Old 5th September 2003, 10:57 PM   #10
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Stunning - I've only seen a few commercial speakers that look as good as yours..

Rob
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