I saw these on ebay night before last with a BIN price of $35. I couldn't let a good pair of horns go by at that price, so snaffled 'em up quick sticks. (I OK'd this with the wife by promising to take our daughter out of the house for a couple of hours yesterday to go and pick them up.) So not only did these turn up at the right price, they came with instant WAF!
Anyway, I need some help working out what these babies will do. Guy I got them from said he got them from some other guy who built these from some specs published in a DIY article of some sort. So if anybody can recognise this project from anywhere online, please point me to it.
Otherwise, specs are as follows;
horn throat area = 10.5 square inches. (3" x 3.5")
horn mouth area = 206.5 square inches (14.75" x 14")
horn length = 12"
back chamber = 210.5 cubic inches (8.25" x 8.5" x 3") without a driver.
As you can probably tell from the measurements they're quite small cabinets. It looks as though they were designed to house an 8" driver?
Can anyone suggest what these might perform best with?
Anyway, I need some help working out what these babies will do. Guy I got them from said he got them from some other guy who built these from some specs published in a DIY article of some sort. So if anybody can recognise this project from anywhere online, please point me to it.
Otherwise, specs are as follows;
horn throat area = 10.5 square inches. (3" x 3.5")
horn mouth area = 206.5 square inches (14.75" x 14")
horn length = 12"
back chamber = 210.5 cubic inches (8.25" x 8.5" x 3") without a driver.
As you can probably tell from the measurements they're quite small cabinets. It looks as though they were designed to house an 8" driver?
Can anyone suggest what these might perform best with?
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
A wild guess
Perhaps made for something like the Galaxy Five inch driver; midrange only.
Usually there is a gap introduced with respect to the driver mounted at the throat. Sometimes this gap has a dacron like material inserted to act as a sealant. You might wish to contact JLH over at the looney bin. Feel free to e-mail me, as that's all I can post here.
Perhaps made for something like the Galaxy Five inch driver; midrange only.
Usually there is a gap introduced with respect to the driver mounted at the throat. Sometimes this gap has a dacron like material inserted to act as a sealant. You might wish to contact JLH over at the looney bin. Feel free to e-mail me, as that's all I can post here.
Galaxy five inch
Also, please note the cone should be treated with damping material. I used 5 coats of DAMAR. DAMAR is a spray used by artists to keep paintings from yellowing.
The S5C160-8 full range transducer delivers maximum sound levels and unsurpassed durability under the most stringent operating conditions. It features a proprietary non-ferrous frame, 40 oz. magnet structure with vented pole piece, underhung voice coil, and linear spider. The 1"Kapton voice coil is ferrofluid cooled to reduce distortion and power compression. Optimized for sealed box enclosures. Made in the U.S.A. * Power handling: 100 watts RMS/140 watts max * Voice coil diameter: 1" * Impedance: 8 ohms * Frequency response: 200-18,000 Hz * Magnet weight: 40 oz. * Fs: 140 Hz * SPL: 92 dB 1W/1m * Vas: .24 cu. ft. * Qms: 1.34 * Qes: .38 * Qts: .30 * Net weight: 3 lbs. * Dimensions: Overall Diameter: 4-3/4", Cutout Diameter: must be rear or flush mounted, Mounting Depth: 2-3/8", Magnet Diameter: 4", Magnet Height: 1-1/8".
Also, please note the cone should be treated with damping material. I used 5 coats of DAMAR. DAMAR is a spray used by artists to keep paintings from yellowing.
The S5C160-8 full range transducer delivers maximum sound levels and unsurpassed durability under the most stringent operating conditions. It features a proprietary non-ferrous frame, 40 oz. magnet structure with vented pole piece, underhung voice coil, and linear spider. The 1"Kapton voice coil is ferrofluid cooled to reduce distortion and power compression. Optimized for sealed box enclosures. Made in the U.S.A. * Power handling: 100 watts RMS/140 watts max * Voice coil diameter: 1" * Impedance: 8 ohms * Frequency response: 200-18,000 Hz * Magnet weight: 40 oz. * Fs: 140 Hz * SPL: 92 dB 1W/1m * Vas: .24 cu. ft. * Qms: 1.34 * Qes: .38 * Qts: .30 * Net weight: 3 lbs. * Dimensions: Overall Diameter: 4-3/4", Cutout Diameter: must be rear or flush mounted, Mounting Depth: 2-3/8", Magnet Diameter: 4", Magnet Height: 1-1/8".
Nice find!
When you take the back off the chamber, can you see the bolt circle from the driver that was there? The diameter of the bolt circle/screw holes ought to tell you what size driver was in there. That's a start.
When you take the back off the chamber, can you see the bolt circle from the driver that was there? The diameter of the bolt circle/screw holes ought to tell you what size driver was in there. That's a start.
Thanks for your input so far guys. I'll check out the 5" Galaxy. The bolt holes that are there look a little unusual in that it appears a driver was secured in the corners only, but size looks about right for a 5" driver, maybe even smaller.
An externally hosted image should be here but it was not working when we last tested it.
I would skip on the Galaxy driver. There are better woofers available now. Take a look at the Faital Pro M5N12-80. It should be good from ~ 250Hz to 1200Hz in that horn. Adjust the back chamber resonance by using expanding foam. You might have to use some poly quilt batting with 1/8" standoffs to create a small throat gap to rid the horn from honk.
Rgs, JLH
Rgs, JLH
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You could also take a look at the P.Audio WN-520N driver. The specs are excellent, at it sounds really good in a front horn! The specs are to be found here:
http://www.paudio.ru/downloads/WN-520N.pdf
Best regards
Peter
http://www.paudio.ru/downloads/WN-520N.pdf
Best regards
Peter
Thanks for your recommendations JLH and Peter! Both those drivers look like good choices. Now that I look at the bolt holes on these little woofers, it's obvious that's what has been in these cabinets before.
I had it in my head for some reason that all drivers naturally had 6 or 8 mounting holes around the perimeter.
A hole in each corner looked weird to me. 😱
I had it in my head for some reason that all drivers naturally had 6 or 8 mounting holes around the perimeter.
A hole in each corner looked weird to me. 😱
Hi again,
I too believe the PRO drivers are better choices if you adjust the rear-closed volumes accordingly to their different T/S parameters.
FYI: follows is a picture that doesn’t show correctly rear loading as the drivers are just compared in the first given enclosure I posted before here above.
b.
I too believe the PRO drivers are better choices if you adjust the rear-closed volumes accordingly to their different T/S parameters.
FYI: follows is a picture that doesn’t show correctly rear loading as the drivers are just compared in the first given enclosure I posted before here above.
b.
Attachments
Many smaller drivers, not just woofers seem only to have 4 bolt holes. This of course doesn't work too well with larger drivers.. 😀
bjorno, thanks for modelling these options for me. (I really should get a copy of Hornresp myself.)
I've been researching the suggestions made so far and came across a very serious looking system by Peter K (more info here) If you haven't seen this set up you MUST check out Peter's straight 29Hz hyperbolic, exponential bass horns!
I've seen his system before, but not since he's replaced the compression drivers with cone drivers, one of which is the 5.25" P.Audio WN-520N 'pk' suggested.
I've been researching the suggestions made so far and came across a very serious looking system by Peter K (more info here) If you haven't seen this set up you MUST check out Peter's straight 29Hz hyperbolic, exponential bass horns!
I've seen his system before, but not since he's replaced the compression drivers with cone drivers, one of which is the 5.25" P.Audio WN-520N 'pk' suggested.
Actually, full range was my first thought, but wasn't sure what this horn was designed for.
I do have a couple of different uses for these horns, but want to work out what they'll do best for before I decide where to use them.
(Incorporate them in a multi-way for my office, or even use them as rear channels for my HT was another option.)
Um, don't sure the galaxy driver.
The magnet isn't strong enough.
You get some directivity, but the horn really only loads it up to (Fs x 2) / qes.
Yes you can run it above that on axis, not ideal, but many designs go against ruke of thumb.
Good to see it rolling off at 300hz, thats what I figured based on the mouth size.
My 1khz midrange mouth is 14" by 24" (more for directivity control).
Norman
The magnet isn't strong enough.
You get some directivity, but the horn really only loads it up to (Fs x 2) / qes.
Yes you can run it above that on axis, not ideal, but many designs go against ruke of thumb.
Good to see it rolling off at 300hz, thats what I figured based on the mouth size.
My 1khz midrange mouth is 14" by 24" (more for directivity control).
Norman
This is the theoretically ideal design goal, but if you put a driver with a lower mass corner on a horn designed for a higher one it will acoustically load the driver to the higher mass corner at the expense of increased throat distortion. Conversely, a higher mass corner driver than the horn is designed for won't load the driver down enough, so will run out of excursion sooner.
This horn wants a ~1180.5 Hz mass corner, so the Faital will be over-damped by it while the P-Audio will be under-damped, ergo the Faital will have the most usable BW. Factor in that it's higher Vas allows more tuning options, it's the much better choice of the two for a HIFI/HT app where its weak motor shouldn't be an issue.
GM
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