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Old 18th April 2012, 08:35 AM   #1
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Default The Ultimate 8" Coax

Hello,

What do you guys consider to be the ultimate 8" Coax? (Compression driver HF preferably)

Money no object! I am currently searching for it, and have tested the likes of BMS, Radian and soon Beyma...

Thanks everyone!
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Old 18th April 2012, 09:42 AM   #2
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B&C SPEAKERS looks quite nice and is very expensive, considered it for some desktop monitors but cannot produce significant bass so would need to be part of a 3 way system.
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Old 18th April 2012, 12:01 PM   #3
Pano is offline Pano  United States
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I think there isn't any such animal. The 8" cone is too small to act as a proper horn/waveguide. They work, but the bigger coaxes work better.
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Old 18th April 2012, 01:42 PM   #4
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Thanks Kipman, shame none of them use the DE250 CD. The neo does look interesting though.

Pano, yes unfortunately the 8" is a compromise in many respects (aren't pretty much all loudspeakers?), just looking for the best in its format. Unfortunately the form factor has already been chosen! (Not by me, I may add!)

Cheers,
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Old 18th April 2012, 02:51 PM   #5
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Quote:
Originally Posted by Pano View Post
I think there isn't any such animal. The 8" cone is too small to act as a proper horn/waveguide. They work, but the bigger coaxes work better.
An 8" co-axial cone/waveguide can be extended as a shallow wide angle horn to good effect as Danley does with the SH-100, or used at the apex of a 90 x 60 degree horn as in the SM-96. In the SM-96 the cone is used in an ofset horn configuration, and the co-ax HF driver directly drives the conical horn.

Both designs avoid many of the problems the "bigger, better" co-axial speakers have.

Art
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Old 18th April 2012, 07:57 PM   #6
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Originally Posted by weltersys View Post
An 8" co-axial cone/waveguide can be extended as a shallow wide angle horn to good effect as Danley does with the SH-100, or used at the apex of a 90 x 60 degree horn as in the SM-96. In the SM-96 the cone is used in an ofset horn configuration, and the co-ax HF driver directly drives the conical horn.

Both designs avoid many of the problems the "bigger, better" co-axial speakers have.

Art
Correct me if I'm wrong, but doesn't the SM-96 use the 5" BMS unit?
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Old 18th April 2012, 10:33 PM   #7
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Originally Posted by weltersys View Post
An 8" co-axial cone/waveguide can be extended as a shallow wide angle horn to good effect
Yes Art, I think that's a great idea.
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Old 18th April 2012, 10:43 PM   #8
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Originally Posted by zerokelvin99 View Post
Unfortunately the form factor has already been chosen! (Not by me, I may add!)
I understand, quite.
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Old 18th April 2012, 11:26 PM   #9
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Click the image to open in full size.

Beyma 8CX300Nd - coming soon hopefully.

Weltersy, will this actually have much of an effect? Surely the expansion is too rapid at the edge of the cone for any loading? Perhaps would help with space loading (4pi to 2pi shift) - reducing baffle step effects.

The expansion of the tested drivers so far is irregular at best - inside the pole piece it's nice and smooth until it gets to the, often straight, cone.
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Old 18th April 2012, 11:27 PM   #10
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And yes, does need correction to sort the reflections between the underside of the horn and cone !
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