BillFitzmaurice.info

have any of you guys tried using horn resp program?
What are the angles and data inputs for the T60 dual lab12 drivers ?
http://www.hornresp.net/
thanks!

The t60 is bills IP. As such the hornresp inputs are confidential. Anyone savvy with hornresp can convert the sketchups back to hornresp. There is very little reason o want to put the t60 into horn resp, all information it will give you is supplied here on the forums.

Getting a horn resp model for a horn is easy. Folding it into a useable form is the hard part, and bill did a lot of work not only to do that for us but to supply the most comprehensive plans of any diy speaker desogner on the web. The most anyone else supplys is generally a sketchup and a 'good luck'

Does it help to have angles not as sharp? To make the horn path smoothed out?

Horn resp designs horns in straight paths. the folding is done afterwards, and has nothing to do with horn resp. there is no program that designs a horn already folded, else this would be a lot easier.


there is no benefit to "less sharp" bends. this is a subwoofer. bass doesnt give a crap about bends. In fact, adding more panel reflectors can actually be detrimental, as it shortens the horn.

And, if it helped, and was easy to achieve for all builders, then, in the case of Bill's designs, it would be in the plans...

If you want to give it a try, there are Autocad scripts around that can help "convert" Hornresp scrips to fit a certain box size.

I have it on my pc, but i am in Korea at the moment and will be for some more weeks. But i am sure a quick Google will find it.

again timp, hornresp does not model folded horns. it models straight horn. this is why it is somewhat difficult to reverse engineer a horn from its already folded model, because you dont fold RIGHT AT s2,s3,s4, but wherever you need to fold in order to fit it in the box. this means sometimes folds are in the middle of a single segment.

I find the folding aspects interesting. I remember Bill saying something along the lines of the panel reflectors help the wave get round the corner or it would cancel out, or something like that. It looks to me like the ('normal' of the) reflector panel angle bisects the overall fold angle and the gap between the reflector panel and the 'sharp' edge of the fold is the other parameter. The bit that still has me foxed is the 'pressure'/throat part and the rate of change, i.e. the expansion, gradient of the horn path. I would imagine horn resp would give some indicators as to what works from putting numbers in and seeing what comes out, in such circumstances where one doesn't know or appreciate horn geometry/design and likely response in the first place.

EDIT: But that's obviously only one small part of getting a good speaker. There's eating, sleeping and breathing speaker design, and then there's tinkering. If you can't do the former, it's hardly worth doing the latter.

I read through an entire thread on I believe was the 1 sheet challenge, or JBells, sub cant remember. However 1 cabinet was rounded at the baffle joints and the original was not and guess what no improvement with the smooth transition curves vs the angled baffles. I also read that you get a db increase for every 90degree turn the sound wave has to make.

Charles Jenkinson wrote:The bit that still has me foxed is the 'pressure'/throat part and the rate of change, i.e. the expansion, gradient of the horn path.

I believe that is the trickiest part to understand and the correlation between T/S parameters and enclosure volume.

Mr Bill I think has nailed those parts.

The 1db gain for every 90 degree turn is bs afaik.... Reflectors are important when there would instead be 2 paralel faces a half wave apart (the rear of a t48 for instace) as that reflection and interaction could negativly effect output a that freq

Michael Murphy wrote: I also read that you get a db increase for every 90degree turn the sound wave has to make.

Take that site off your reading list.

I saw a similar description when a 3rd party website was trying to describe how their labhorns got so loud. Rxcept they claumed 3db for every bend.