suspending a small tweeter in front of woofer for "coaxial" effect?

bikehorn · 2nd January 2006, 06:47 AM

long story short, i'm building a set of 15" Karlsons for myself. my non audiophile brother wants a set of speakers - if my Karlsons work out nicely i'll build him a 12" set.

for my own, i was going to take a 3-way approach.

for a smaller set, though, i thought it would be interesting to use a coaxial speaker. unfortunatley the Eminence Beta12CX has too high of a Qts to be ideally used in a Karlson so i had for a while scrapped the idea because any other coaxial i came across was way expensive. then earlier today i was thinking about a possible solution when i remembered seeing pictures of vintage coaxial speakers in which a tweeter was suspended centrally over the woofer cone as part of the frame. this got me thinking...

in most Karlsons the speaker is mounted to the back of the baffle. if i were to attach a minimal crossbar from the front side of the baffle, with a disc in the middle to attach a 3/4" or 1" tweeter(like a Morel MDT12 or Peerless 811435) to, i could come up with what would seem to be a reasonable approximation of a coaxial of that style. this would allow me to maintain a reasonably point-sourced setup and grillecloth it like an old skool Karlson so that neophytes would be none the wiser

has anyone tried this sort of thing before? is it doomed to failure? Karlson or no Karlson.

RobWells · 2nd January 2006, 09:07 AM

Diffraction - coaxial tweeter?

Rob.

Aghead · 2nd January 2006, 10:01 AM

ONe of the worst speakers I've ever heard was a coaxial KEF selling for C$1500 about 15 years ago. WIth any complicated signal it just fell apart. Hard to describe, but psychotic would be a good descriptor.

The salesmen had just given a big spiel on how great this coaxial point source thing was.

Landroval · 2nd January 2006, 02:04 PM

bikehorn, Audio Physic is using suspended tweeter in front of the midrange driver in their top-of-the-line Kronos and Caldera speakers. They know what they're doing so go ahead and try it.
http://www.audiophysic.de/

2nd January 2006, 06:47 AM	#1
bikehorn diyAudio Member Join Date: Aug 2004 Location: toronto	suspending a small tweeter in front of woofer for "coaxial" effect? long story short, i'm building a set of 15" Karlsons for myself. my non audiophile brother wants a set of speakers - if my Karlsons work out nicely i'll build him a 12" set. for my own, i was going to take a 3-way approach. for a smaller set, though, i thought it would be interesting to use a coaxial speaker. unfortunatley the Eminence Beta12CX has too high of a Qts to be ideally used in a Karlson so i had for a while scrapped the idea because any other coaxial i came across was way expensive. then earlier today i was thinking about a possible solution when i remembered seeing pictures of vintage coaxial speakers in which a tweeter was suspended centrally over the woofer cone as part of the frame. this got me thinking... in most Karlsons the speaker is mounted to the back of the baffle. if i were to attach a minimal crossbar from the front side of the baffle, with a disc in the middle to attach a 3/4" or 1" tweeter(like a Morel MDT12 or Peerless 811435) to, i could come up with what would seem to be a reasonable approximation of a coaxial of that style. this would allow me to maintain a reasonably point-sourced setup and grillecloth it like an old skool Karlson so that neophytes would be none the wiser has anyone tried this sort of thing before? is it doomed to failure? Karlson or no Karlson.

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2nd January 2006, 09:07 AM	#2
RobWells diyAudio Member Join Date: Aug 2002 Location: UK	Diffraction - coaxial tweeter? Rob.

2nd January 2006, 10:01 AM	#3
Aghead diyAudio Member Join Date: Apr 2005 Location: Hamilton	ONe of the worst speakers I've ever heard was a coaxial KEF selling for C$1500 about 15 years ago. WIth any complicated signal it just fell apart. Hard to describe, but psychotic would be a good descriptor. The salesmen had just given a big spiel on how great this coaxial point source thing was.

2nd January 2006, 02:04 PM	#4
Landroval diyAudio Member Join Date: Oct 2004	bikehorn, Audio Physic is using suspended tweeter in front of the midrange driver in their top-of-the-line Kronos and Caldera speakers. They know what they're doing so go ahead and try it. http://www.audiophysic.de/

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