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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: There is no backup, but it would be nice to have one.Posted by Romy the Cat on: 9/11/2010
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 Romy the Cat wrote:
One of the emails that I receive is very interesting. The author warns:
 
“...when experimenting with throaths I found that if the compression is big, near 2 or higher you get some big, smooth, unfocused aqualung sound. You are never scared at listening to that sound, like being on some downers at the concert under the water. The same was true with compression drivers ( 2440 ) when experimenting with phase plugs and listening without one, or with pre WW2 WE type ( or quasi modern japanese renessance ).”
 
The observation is correct. Most of the bass horns that I head have that unfocused aqualung sound; I usually call it “sewer pipe sound”. I certainly do not want my horn to sound this way and I have my own theory why the most of the bass horns out there sound as poor as they are. I however never consider that a guilty party might be the compression ratio.  I personally feel that a compression is irrelevant if the rest of the operation parameters of the driver and horns are taken care with respect to the given compression. I might be wrong but it is my position. A compression itself does not ruin sound the specific design decisions that can’t work properly with a given compression will most certainly ruin sound. So, even the warring is reasonable then I think the causality of the effect is incorrect. If I am wrong and if compression is devastating for bass then… this is why I am making the backs chamber in a way that the drivers mish be changed … Still, I hope that I will not have a need to do it.

As I said before I think (and hope) that compression itself not a problem and people might get mislead by improper damping for a given compression rate. However, what is I am wrong? The midbass horns do have tendency to round a bit transients of lower knee. Is it a problem of topology or a problem of implementation?

Anyhow, I think it would be useful to have backup option that would allow testing a low compression view in case I face problems with my 15 incher.  I have now 15” into 7” with ¾” of front chamber, which adds even more compression. Will it work, will I have those wonderful LF transients that I have with my 12 bass direct radiators drives in my old listening room? It is hard to say but I know it would be very nice to have low compression option with some kind 8”-10” driver.

So, if anyhow know any interestingly sounding 8-10 driver then feel free to pitch me. It shall have a resonant frequency no more than 55Hz-60Hz, sensitivity around 100dB, dry paper diaphragm and paper or cloth suspension. I afraid with this specification it will have 10-12mm excursion and will have no surface to displace air. Still, I hope something low excursion might be available out there. If everything goes south and I have nothing to try then I might close my eyes on sensitivity and will try Tannoy Red 10” with MF section. I hope I will not have a need to look for anything else but I still would like to have options. I am truly can’t wait to hear the thing…..

The Cat

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