Another CSS WR/FR design -- The Bipolar Bipoles - Page 2 - diyAudio
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Old 4th November 2005, 03:13 AM   #11
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by layertone


You can check Shopbottools for their current prices; as far as my router features,
- 4HP Brushless Columbo Automatic Tool Changer Spindle (3 tool holders) 240v Single Phase, 11 amps
- 49" x 97" Table Area (perfect for MDF)
- Vacuum table / channels for part hold-down / Aluminum T-Slot Table
- Closed Loop Servos / Ball Screws on all 3 Axis
- Repeatability .001", Resolution, .0002"
- beefy 1,500 pounds

Enough specs! The router was about $30,000, shipping about $2,000, ArtCAM Pro Software $7,500, Oneida-Air 2-stage Dust Collector, about $1,500 forklift rental...... (got myself into lots of trouble here)

I don't have any problems with cracking; dowels & Titebond glue on every layer holds plenty

Birch Plywood works very well; I use a 3/8" compression end-mill for a clean cut - MDF, birch ply, solid maple.... round corners, not a problem at all;

I can send you a sample or if you need something cut, just send me an e-mail,

Thanks
CNC MDF is almost perfect, especially the higher density the better. But with something like birch, doesn't it get a little rough around a large radius corner as the cutter gets to about 45 degrees to the fibers?
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Old 4th November 2005, 03:30 AM   #12
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As with all router bits & cuts, the roughness - going against the fibers would require some sanding afterwards;
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Old 4th November 2005, 03:31 AM   #13
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I saw your post at the fullrange stating to wait; It's ok, I just had a spare sheet and just want to try something; i think the PAWO is neat because it's slim & easy to build; nothing goes to a burn pile, it could be used for the garage somewhere if it doesn't turn out right
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Old 4th November 2005, 04:05 AM   #14
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Quote:
Originally posted by layertone
I saw your post at the fullrange stating to wait; It's ok, I just had a spare sheet and just want to try something; i think the PAWO is neat because it's slim & easy to build; nothing goes to a burn pile, it could be used for the garage somewhere if it doesn't turn out right
It is neat, and has high WAF, but if we can't get them to sound listenable, the prototypes will hit the burn pile, and the bamboo ones will have the backs routed out and the partitions drilled with holes to make it sealed....

dave
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Old 4th November 2005, 04:56 AM   #15
TomekZ is offline TomekZ  United States
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My favorite speakers of the 1980s were British sealed cabinet designs by B&W and Celestion and Epos. The bass always seemed integrated, making smooth transitions into the midbass on up...till they got to the tweeter.

Besides a more spacious sound and more efficiency, what other benefits are there to a bipole.

One thing I wonder about with the bipolar bipole design that could give a third or fourth sound would be to electrically disconnect one of the drivers and use it as a passive radiator? Would this be feasible?
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Old 4th November 2005, 06:20 AM   #16
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Quote:
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Besides a more spacious sound and more efficiency, what other benefits are there to a bipole.
The biggest benefits are no bafflestep, and push-push loading of the driver -- active vibration cancelation which means better downward dynamic range & much less box load -- the shell of this box is 1/2".

Quote:
One thing I wonder about with the bipolar bipole design that could give a third or fourth sound would be to electrically disconnect one of the drivers and use it as a passive radiator? Would this be feasible?
A pretty expensive passive radiator. And since the PR should be a size up from the driver size and adjustable for mass, not a very effective one. (if anyone wants some 6 1/2" PRs i've got some)

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Old 4th November 2005, 07:45 AM   #17
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Quote:
Originally posted by planet10


It is neat, and has high WAF, but if we can't get them to sound listenable, the prototypes will hit the burn pile, and the bamboo ones will have the backs routed out and the partitions drilled with holes to make it sealed....

dave

Out of interest Dave, what's the problem with them at present?
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Old 4th November 2005, 09:35 AM   #18
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Out of interest Dave, what's the problem with them at present?
They have a cupped, closed in midrange that makes them hard to listen to for very long. I suspected bounce off the back, but GM thinks the compression chamber is too small. We have a set of mules we can route out the back and add another piece over the back increasing CC size by about 20% without affecting the horn/transmission line. Given that we are sitting on an absoulutely gourgeous pair made of bamboo plywood, well worth a bit of effort to figure out.

Click the image to open in full size.

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Old 4th November 2005, 09:58 AM   #19
soongsc is offline soongsc  Taiwan
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Those ARE beatiful! They are located in my favorit location too where the first reflections probably go through two bounces before they reach the listener.

As far as sound goes, bamboo is more springy than wood, so I would suspect baffle vribration coupling into the driver.
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Old 4th November 2005, 09:59 AM   #20
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Oh yes! Amen to that (drool). Do let us know the results -it'd be a crying shame to have to give up on those bamboo jobs! Oh yes, one other quick question (sorry!) -what's the wire you're using in the pictures of the bipoles and horns?

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