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In the Forum: Horn-Loaded Speakers
In the Thread: What are the effects of back chamber volume for mid-bass horns?

Post Subject: Here and therePosted by Romy the Cat on: 9/27/2013

rickmcinnis wrote:
Is there a consistent effect from too large/too small and how is it analyzed?

Working on a new horn that I had turned by a fellow in Hungary and have made my back chamber so that I can easily
manipulate the volume but have no idea of what to expect.

Knowing you have gone through the process a number of times I am hoping you will be willing to give me some guidance.

There was an old thereds that will do it:

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=2991#2991

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=4421#4421

rickmcinnis wrote:
Audible clues? or does one need to rely on measurements to get in the range?
I am still in the process of getting the thing ready so I have no idea what it sounds like at the moment. Starting off with HORNRESPONSE calculated value which is based on driver manufacturers specs instead of measuring for myself which probably makes the value next to useless.

Audible clues are an interesting subject. I would discard the HORNRESPONSE. That is irrelevant crap. You need to look at the max bottom EQ and for the character of lower octave of your horn. it has to have a “specials” slowness but able to play high transient if music calls upon it. It has to be not suffocated tonally. All of it very hard to explain in world and need to be once demonstrated and you will know what and how to listen. You can very precisely offset your throat resonance with back chamber but ironically the last little 1 Hz of precision do impacts sound very audibly, the larger horn the more impact.

rickmcinnis wrote:
Using the B&C 12 inches driver as recommended by John Inlow. Unobtainable drivers like your favored FANES would have been tried if ...

I do not think that Fanes are unobtainable and I do not know the B&C 12.

rickmcinnis wrote:
Yes, I am going with more of an EDGAR type set-up than A BESNOW set-up since that is the best I can do. This round horn will replace my EDGAR 75 hz square hoen with the EV driver.

The Bruce’s approach is to use a large throat, the smaller throat the more EQ you had and the more effective would be the influence of back chamber. If you use too large driver over smaller throat then an exercise compression might easy up your tonal quality of the driver.

The Cat

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