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Old 20th July 2008, 09:46 PM   #1
Fuling is offline Fuling  Sweden
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Default Front horns for FE167E?

Hi!

Does anyone know if FE167E can be used (succesfully) in front horns? Almighty Google reveals nothing on this subject...
Im new to horns and I dont know exactly which parameters that are important (is Qts: 0.31 too high?).

http://www.madisound.com/catalog/PDF...ers/FE167E.pdf
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Old 21st July 2008, 04:55 AM   #2
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I would recommend downloading and reading the theory and technology .pdf behind front loaded horns from this well regarded maker. Making a precise shape would be difficult.

http://www.avantgarde-acoustic.de/
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Old 21st July 2008, 06:49 AM   #3
Fuling is offline Fuling  Sweden
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Thank you!
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Old 21st July 2008, 07:57 AM   #4
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I'm no horn expert but I'll take a stab at this................

to see if a driver will work well in a horn you start with its mass corner.....

The stronger the magnet and the higher the fs, the higher it will go in a front horn without a phase plug.

to quote a friend " The mass corner is twice the EBP. Think of it as a horsepower-to-weight-ratio kind of thing. The heavier the cone, the more force you need to make it go fast (high in frequency). To avoid excessive EQ, it's a good idea to have the mass corner be at least .707 the highest frequency you intend to run the horn to. IE: if you need to go to 1Khz, try and find a mass corner of 700hz or higher. "

http://db.audioasylum.com/cgi/m.mpl?...er&r=&session=

Here is a jbl link on formulas..............
http://www.lansingheritage.org/image...-3a/page07.jpg

here is a link on a 10" jbl, response has similar lowther rise due to low qts.........
notice on page 2 what it looks like not in a horn, then on page 3 what response looks like on a horn.............
http://www.jblpro.com/pub/technote/tn_v1n24.pdf

That 10" has .21 qts and fs of 61................

using the formula then 2xFs/qts = gives around 580hz.......
the phase plug helps it go a bit higher, without it, it'd roll off above 580.

The fostex 206e would be a better choice than the 167e due to the lower qts...................

also notice on the first link I gave you, the lower qts driver has more output per watt but has a rising response (like a lowther).

here's the 167e
http://www.fostexinternational.com/d.../fe167erev.pdf

.31 qts would make a not bad sealed.

" Tom, Oris horns reduce the peaks of Lowther drivers" by jonathanD on high efficiency audioasylum.com

So the air mass is squashing them...................


So, yea, no front horns, and no rear either.....................

If ya want more bass, cross them to a pair of 12's or 15's.

Norman
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Old 21st July 2008, 11:42 AM   #5
Fuling is offline Fuling  Sweden
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Thanks for the reply!

Im at work right now so I havent checked all the links yet but the bottom line is that they are not suitable for horns, right?
My FE167Es has played in closed boxes, vented boxes and open baffles so far, with and without subwoofers.
OB with woofers was great in every aspect but one: my room messed things up in the 100Hz region. Im moving from my apartment to a house in August, so maybe its time for some new OB experiments.
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Old 21st July 2008, 02:09 PM   #6
GM is offline GM  United States
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Quote:
Originally posted by Fuling

.........but the bottom line is that they are not suitable for horns, right?
No, just that due to a low mass corner the throat will be large, ergo the mouth will need to be very large to make it at least a 1/4 WL long at the desired F6. The upside is it will be a lower distortion horn.

GM
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Old 22nd July 2008, 07:10 AM   #7
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yup gm, you summed it up quicker....................

or even quicker, In a front horn it will act like a direct radiator above 300hz............below that you could get 6db of gain but a 100hz front horn on the floor needs 3.76 foot of length (1/2 octave below mouth Fs) and about 5 ft2 area mouth, half that if against a side wall (ideally concrete though).

norman
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Old 22nd July 2008, 09:34 PM   #8
Fuling is offline Fuling  Sweden
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Thanks guys for helping me out!
A pair of 3,74ft long front horns that operates from 100 to 300Hz is pretty much out of question.
Low Qts seems to be the key to achieving good bandwidth.
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