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Why not coax?

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Posted on October 23, 2009 at 09:58:04

Rocket 88
Audiophile

Posts: 3
Location: Mountain West
Joined: October 23, 2009

Okay, sufice it say that I'm comitted to building a pair. Mercury design likely. I'd like to go with the OB bass section, or a similar RiPOL design using the RYTHMIK AUDIO servo controlled subs.

My question is why are there no coaxial versions of the larger drivers? What is to be gained with separating the compression driver from the main driver? I have always thought that imaging was to be superior with the concentric arrangement.

Please excuse this note if it has already been followed up, I'm not at all proficient with forums, as of yet.

I really like what you guys have done with the "clones" etc. Plenty of talent here.

-Rocket.

RE: Why not coax?

Robert Bastani

23:05:25 10/24/09

RE: Why not coax?

Rocket 88

07:29:43 10/26/09

RE: Why not coax?, posted on October 24, 2009 at 23:05:25

Robert Bastani
Manufacturer

Posts: 224
Location: Germany
Joined: November 12, 2004
Contributor
Since: October 7, 2004

Hi Rocket,

the Rythmik woofer- amps are very good, you can use them for all Bastanis woofers.

Imaging and musical content is affected by the quality of the speakers from about 150Hz-200Hz up to about 7Khz-8Khz, so using a single driver in this frequency band offers many advantages.
The Bastanis wideband drivers work withinin this frequency- spectrum on the open baffle without any crossover, also they offer extremely high efficiency and huge dynamics. The tweeters can be placed away from the widebands without any restrictions because of the real wideband behaviuor of the 12" drivers.

- There are no issues from interferences like shown by common multiway speakers with a lower crossover- point.

- There is no need to place a compromised horn- contour inside the voicecoil of the widebands. Coaxial designs with a lower crossover- point than 7Khz have a better imaging than common multiway speakers (crossover lower than 7Khz, tweeter beside the midrange) but they show a number of other issues. The horn inside the voicecoil of the midrange always is a compromise, the horn physically disturbes the bigger cone at higher frequencies and the main- issue are interferences between the big cone and the centered tweeter, a coax shows the worst behaviour of all methods to place a tweeter.

- The small horn which is used for the Bastanis o.b.- design works without the typical resonances of bigger horns.

Regards
Robert Bastani

http://www.bastanis.com

RE: Why not coax?, posted on October 26, 2009 at 07:29:43
Rocket 88 Audiophile Posts: 3 Location: Mountain West Joined: October 23, 2009	Thanks Robert! Exactly what I wanted to know.

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