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brsanko 27th August 2004 06:45 PM

front horn Idea
I've got an Idea for a good front horn design. I would start with the fostex FF125k in a front horn loaded down to about 300hz. I think this is a good choice for a front horn because the response starts rising drastically after about 1500 to 2000 hz. Then I would place a super tweeter crossed over at 10khz above it, probably the FT17H. Underneath the horn I would have about 8 6" woofers in an isobaric bass reflex cabinet crossed over at 300hz. That should give me an f3 of about 26hz with the woofers I have in mind and a cabinet of aproximatly 2.5 cubic feet. With 8 drivers it should match the sensitivity of the horn.
I would like to do a round front horn but a square horn seems to be a much easier option. I'm not quite sure of what the difference would be as far a sound quality is concerned. If the difference is significant and some one knows a relitively easy way to build a round horn any suggestions would be appreciated.
let me know what you think of my idea.

rcavictim 27th August 2004 07:04 PM

You've just closely described the newest speaker project I'm working on that I have a working prototype of in my living room now of the mid horns sitting on a couple of 12" BR boxes I had around just to try the idea. In my rough prototype plan the woofers are 8" and there are not as many as I only have a total of eight in stock. I haven't built the bass boxes yet because i just cannot get high enough efficiency out of 4 woofers to matchg my HF horn and may just wait until I can afford it and order more 8" woofers. This is not attractive though in what was hoped could be a commercially viable design and components costs have to be minimized. I use completely different drivers than you propose and am operating without a tweeter since my mid driver goes high enough. My target application is very high efficiency for use on low power SET or tube amps in general.

As such I'd have to give your idea my blessing to proceed with encouragement. Good luck. Horn loading the largest portion of the midrange as low as 100-300 Hz really rocks.

I looked at the FT17H and almost purchased a set until someone else on this board said they weren't all that great. For what you are making, for a high tweeter I think you definitely want great.

brsanko 27th August 2004 07:09 PM

out of curiosity what drivers are you using.

rcavictim 27th August 2004 07:35 PM

The FR horn driver is a 6" FR no-name unit from Taiwan with a paper cone, treated paper accordion surround and ceramic magnet. I bought the entire stock from a company (almost 400 pcs.) when I discovered how smooth and extended these were. 2nd and 3rd order HD is very low. I'm also using them very successfully in some prototype open baffle arrays with some modification. They are very efficient, and I just discovered much to my delight, love to be horn loaded with an open back.

For woofers I was going with the Dayton 8" woofer PN 295-310 from PE since I have 8 NIB in stock. Getting these from the US is a real pain though because of killer shipping and border expenses.

Here are the FR horns presently on the 12" BR cabs in test configuration.

rcavictim 27th August 2004 07:45 PM

2 Attachment(s)
OOPS. The list wouldn't accept my picture as an edit.

AuroraB 27th August 2004 07:52 PM

Are the front horns original Oris,- or something else ???

brsanko 27th August 2004 08:18 PM

are you interested in selling any of those fr drivers. and tell me more about your horns they look good but if I'm not mistaken I think the oris horn are for 8" speakers and you said yours were 6" so I would guess they are something else.

BillFitzmaurice 27th August 2004 08:43 PM


I would have about 8 6" woofers in an isobaric bass reflex cabinet crossed over at 300hz. That should give me an f3 of about 26hz
I'm curious about a couple of points. What 6" driver will give you an f3 of 26 Hz, and how do you plan to get horn style sensitivity with an isobaric configuration? Isobaric pairing halves the required cabinet size but does not increase sensitivity,and I'm not aware of any 6s with the requisite Fs and Qts to achieve a 26 Hz F3.

brsanko 27th August 2004 08:48 PM

I don't know the name of the driver but it is available from mcm electronics for $10. it has a sensitivity of 92db @ 1w/1m. with 8 of them in a isobaric configuration it should yield a 98db sensitivity, right? it's t/s parameters are fs:42hz qts:.54 and vas .5 do the math.

BillFitzmaurice 27th August 2004 09:13 PM

I've used those woofers, # 55-1170; the specs are inaccurate. F3 of45 Hz is about all you'll get. Don't expect miracles for ten bucks.

You'll also want to consider the Xmax; even if the box could get to the suggested F3 the small Xmax is going to result in blown suspensions with any appreciable power input below 60 Hz or so in an isobaric alignment. Isobaric pairings lower the required box size but the acoustic output capability remains the product of the cone area x Xmax of only the driver(s) that is actually exposed to the air.

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