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In Reply to: RE: optimal horn type posted by ogima on May 30, 2007 at 11:10:54
Greetings, Dan...
you have gotten some good advice and some rotten... you really should talk to Kevin Brooks on this... I have hard these drivers at his place... sounded very good...
what you need is length.. that is what 99% of the horns in this frequency range will be short of (ha!).... Hasquin was not dealing with compression drivers, so his horns were shorter... you can use tractrix in this range... round or rectangular (use 1:1.6)... your horn will have to be long due to the small throat of your driver... the catch is that longer horns don't sound as good on the higher end.... but I think what you want is just a glorious ~100 to ~600... and for that I think you have the perfect driver.... and the throat size will dictate that almost any 75Hz horn will deliver exactly what you want...
I don't think that the shape is all that important for the center seat... many shapes can sound wonderful... but, I would try for round.... it will be big, though... perhaps an eleven sided petal horn like the German Goto users would be best....
I have played with quite a few drivers in this range... and they have all been good... horns just rule the midbass... I am working with Ming Su, the US Goto distributor, on a few things and I am very excited that this technology is attracting more followers... the Asylum regulars from Cogent are also building incredible midbass compression drivers... a new golden age? I doubt it, but I sure am glad to have these things around!
Peace,
Me
Follow Ups:
Hi Me,
Thanks for re-enforcing the notions I`ve had as far as these drivers go.
Yes, the horns are big but in theory they should really produce if properly implemented. That`s why I was preoccupied with making a wrong
turn with regards to horn type. I also much prefer the round configuration. Do you feel that the Ale middle low driver can do 70 hz to 600 hz as well as any of the others you`ve worked with ?
I will certainly speak to the distributers you mention for more particulars. Much appreciated.
Dan
Hi Dan,
You need to talk to Kevin regarding the best application of your ALE driver.
I can share with you my GOTO setup. I use twin GOTO SG146LD4 compression bass driver with Y-throat adapter mounted to a 1:2 ratio rectangular horn. By using twin driver per channel, it shorten the horn length by about 73 cm. If you use 4 driver per channel, you can reduce even more. Due to the size of my listen room, I have to limit the horn to cutoff at 60Hz and crossover at 70Hz. The top end will be limited at 400Hz. Everything above 400Hz will use GOTO round hyperbolic horn. The 70Hz down will use GOTO 15" driver in bass reflex cabinet. GOTO provides round hyperbolic horn for cutoff freq. of 150Hz, 200Hz, 300Hz, 600Hz and 800Hz. The 3000Hz horn come with GOTO tweeter.
Hope this help,
Ming
Hi Ming,
Sounds like you have quite a wonderful system going there.
What are your observations WRT time alignment in the 70-400Hz range?
Do you use digital delay, and if so how does it work for you?
Also interesting how you can shorten the horns by adding drivers.
Could be a little expensive right :-)
That 70-150 range is a real bear to deal with.
Take care,
Mats
Mats,
My bass horn won't be ready until end of July. By then, I will deal with the time alignment issue, however, since the horn length is just 102", the issue should be min. I am using active crossover and can deal with that in that domain if needed.
Ming,
So you are already getting "Goto-quality" filtering in the digital domain?
Do you care to elaborate? I have a DCX2496 that Jeffrey Jackson tweaked, waiting for the right project.
102" is not bad at all. Is it a J-horn? How big is the mouth? Late July arrival eh? Please share pictures!
Mats
NO. I will have to wait until the bass horn is ready and all the other driver in place to deal with time issue. According to other GOTO user, there is no problem to deal with that. Some use digital domain to adjust but most do not have to do any.
All horns are straight horn including the bass horn. GOTO insists on using only straight horn for all their driver.
Sure, I will post sme pictures once the system is ready.
has been shown on the web many times. The bass horn is rectangular with a 3' x 4' mouth and about 17ft long or so. IIRC, it is an elliptical expansion and will respond to about 70hz.
As much as I love Azura horns, they will not allow this driver to respond below 150-200hz.
Josh has built horns for this ALE driver also. His were not rectangular, but I could not characterize the shape exactly. :) He used more of a tractrix expansion for his, so they were shorter than Kevin's, and they had a long sweeping tail on them...reminescent of the old WE horns. He has also built some that hybridized tractrix and conical expansions for midrange and HF, that sounded pretty good.
It is critical to get the length and mouth size correct in order to fully optimize this driver's capabilities. But when you do.....Oh baby....:)
He is now finishing up horns for some Cogent drivers that are pretty nice. You can contact him at electronluv.com for information and advise about utilizing this driver.
See you later
D
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