help with hornresponse

[giolight]

I have problem running hornresponse.
I want calculate a basshorn 35/40Hz-300hz with two RCF 15-554 woofers for each horn in a corner position.
But what I get is unreasanable maybe some of you has 10 minutes to try.
I attach T/S parametres.
Giorgio

[Centauri]

Not sure if you are implying two drivers in each horn, or one driver each horn in room corners. When you say "unreasonable", what unreasonable results are you getting? If you want best response down around the 35Hz mark, then expect mouth area around 7200cm^2 corner loaded. If this is too large, then tradeoffs can be made in regards low end efficiency and passband ripple.

Do you have these drivers on hand, or intend to purchase them? For home use they would seem to be a bit overkill, and their Fs could be a touch low for a horn. Could very well be better off with a 12" design if space is a problem. How loud do you want it?

Cheers

[giolight]

I'm implying two drivers each horn. I get only S1 and S2 not length. In order to reduce mouth size I can accept 40Hz response.
I have them so I'm triyng to use them. I expect loud 102-105dB.
Giorgio

[Centauri]

Hmmmm, they don't like to go down all that low in a horn without a fight....... seem to need small throat area to get any low end - should be loud though!

Try this:

Cheers

[Centauri]

....and the input parameters to get it:

[SkinnyBoy]

Originally posted by Centauri
....and the input parameters to get it:

umm... SD of 1700cm^2??? two drivers? yeah?? compressed to 400cm^2 I don't think so.. lol

[mikee12345]

thats a moderately high compression ratio,which isnt the best for unknown speakers

edit-1700cm for TWO

actualy its only ~2:1 each..
skinnyboy!

[Centauri]

Originally posted by mikee12345
thats a moderately high compression ratio,which isnt the best for unknown speakers

edit-1700cm for TWO

actualy its only ~2:1 each..

Actually is more like 4:1, which is reasonably high for bass horn, but this particular driver is a pretty good one and should be able to handle it ok. If these horns are mainly used in a domestic environment, then the volume level in the throat should be low enough not to cause problems.

Cheers

[giolight]

VRC 250.00 rear compression chamber volume 250 litres?
Giorgio

[Centauri]

Originally posted by giolight
VRC 250.00 rear compression chamber volume 250 litres?

Yep, smaller volume gives very peaky response down low - may be able to get away with half this, though.

Don't really think this driver is overly suited to horn use, but could be done. These drivers were very common in bass reflex EAW boxes.

Cheers