Re:Here's the thing... - Dave-A - High Efficiency Speaker Asylum

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Re:Here's the thing...

Posted by Dave-A (A) on May 14, 2003 at 07:22:20

In Reply to: Yep posted by smallpond on May 12, 2003 at 19:44:25:

I don't know about all the studies, but our trials went like this.
Like I said, the PHY TL / Azura test was crude, but it indicated what front load horns do. They increase the efficiency of the driver by about 3 db over the direct radiator function. That leaves an obvious lag in the LF.

Our latest work involves a Fostex 168 driver. We have it in a BL horn and in a FL horn...the Big Beast.

First of all, we use a compression chamber behind the driver in the FL horn, which would obviate the use of a BL horn, but more to the point, this arrangement boosts the eff by about 6 db over normal direct or BL horn use. We have it in a tandem use with a 100db ribbon and they match very well.

In the BL horn, this driver will operate at about 96 - 98db eff at best. That is a clear attenuation of the BW. What's more, I don't know how the removal of the compression chamber would further effect the overall response. My guess is that it would lower the FW eff a little [maybe 1/2], but it could also goof with the response itself, since the chamber is mechanically damping and smoothing out the driver's response.

For my money, I will pursue a different path to solve this puzzle. I think that once you get the primary driver to respond below 100hz [in the front horn] you can use a subwoofer of some sort. All the rest is relatively easy, but BL/ FL horns are a difficult [at best] proposition, and will yield questionable results, IMO.

What about a PP FL bass horn. Anybody?

Thanks for the pics.

Later
D

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Follow Ups Full Thread

Topic - A front horn / back horn hybrid? - smallpond 12:21:16 05/12/03 (17)

Re: A front horn / back horn hybrid? - Tom Dawson 15:46:35 05/14/03 (0)

Re: A front horn / back horn hybrid? - Steve Schell 22:42:33 05/12/03 (0)

Re: A front horn / back horn hybrid? - Bill Fitzmaurice 16:56:48 05/12/03 (14)

Re: Double Loaded. - Paul Eizik 16:38:56 05/13/03 (4)

Re: Double Loaded. - Paul Scearce 07:28:30 05/14/03 (1)

Re: Double Loaded. - Paul Eizik 19:22:06 05/14/03 (0)

I built one of Olson's double horns - Bill Fitzmaurice 04:56:17 05/14/03 (1)

Re: I built one of Olson's double horns - Paul Eizik 20:12:48 05/14/03 (0)

Re: Yes.. - Dave-A 18:33:59 05/12/03 (8)

Yep - smallpond 19:44:25 05/12/03 (7)

Re:Here's the thing... - Dave-A 05/14/0307:22:20 05/14/03 (0)

Re: Nope. - Paul Eizik 17:49:59 05/13/03 (2)

Re: Nope. - Michaelz 05:18:21 05/14/03 (1)

Re: Yep. - Paul Eizik 20:42:30 05/14/03 (0)

Re: Yep - Chef Henry 12:45:35 05/13/03 (2)

Re: Yep! - Paul Eizik 19:15:03 05/13/03 (1)

Re: Yep! - smallpond 00:00:12 05/14/03 (0)

Follow Ups

Re:Here's the thing... - Dave-A 05/14/0307:22:20 05/14/03 (0)

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