Home » Audio » Speaker » Pro's and con's of adding a super tweeter to HF horn section?
Pro's and con's of adding a super tweeter to HF horn section? [message #19559] Tue, 29 July 2008 15:51 Go to next message
Norris Wilson is currently offline  Norris Wilson
Messages: 361
Registered: May 2009
Grand Master
Could someone explain the basic pro's and con's of adding a super tweeter above a 1" DC with constant directivity horn in a three-way direct radiator speaker?

In my case I would be using JBL 2226J 16 ohm 15", JBL 2118J 16 ohm 8" midrange, 1" Beyma CP-385Nd 8 ohm compression driver with Beyma T250 horn, and the super tweeter would be the B&C DE35 at 8 ohms.

Would there be any benifit in not using EQ to extend the high frequency of the Beyma CP-385Nd? Allowing the 1" CD and horn to roll off naturally around 10kHz to 13kHz, then rolling the DE35 in gradually where the CP-385Nd rolls off up top?

I have read where many have implimented a similar combination of drivers using a 1" compression driver with horn and super tweeter to their speaker system with good results. But, there have been references to the difficulty of implimenting this type of high frequency design, especially with phase issues.

Since there appears to be some distortion issues with a 1" compression driver reaching a high enough frequency extreme, 18kHz to 20kHz range without coaching with EQ.
That it makes common sense to use the proper driver to cover the extended frequency range above 10kHz, the B&C DE35.

Or, are there to many compromises and problems introduced in doing so, where it would out weigh the gains?

Are there any references where a newby could learn the proper way of building and implimenting such a design?

Any help and direction would be appreciated.

Thanks

Norris

Re: Pro's and con's of adding a super tweeter to HF horn section? [message #19560 is a reply to message #19559] Wed, 30 July 2008 15:36 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18782
Registered: January 2001
Illuminati (33rd Degree)

The pros are extended HF. The cons are there's no way to get good summing at a high crossover frequency. The higher in frequency the crossover, the more narrow the angle between anti-phase nulls. So what you end up with is basically no area of constructive summing, all areas are outside. Dense intereference is the best you can hope for, because at least it creates a fairly uniform average distribution. In the end, it always sounds phasey to me.


Previous Topic: dummy impedance/power load to replace speaker being repaired?
Next Topic: strange phenomeneon
Goto Forum:
  


Current Time: Thu Oct 31 17:49:06 CDT 2024

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Miller Audio
Miller Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest