they are advertised to play up to 3khz.
with 0.09 mH inductance they should play much higher.
has anyone measured these drives?
I was thinking to get about 60 of them for line array.
http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=289-084
with 0.09 mH inductance they should play much higher.
has anyone measured these drives?
I was thinking to get about 60 of them for line array.
http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=289-084
Might be interesting in an open baffle line array with that 0.53 Qts? But 60x$3 is a pricey experiment, and with PE being over-optimistic, 3kHz is probably right. Definitely a visual statement, though (and a chance to tweak with EQ and xover). Get 10 tiny tweeters to go along with your PE order....
MisterTwister said:
vented pole pieces are noisy and will have a very specific resonance. The air trapped under the dustcap is bad enuff without adding insult to injury. Not so bad in a sub where there is a seriously opaque dustcap and the oil can resonance should be way above the pass band, but in a mid?
dave
planet10 said:
Is it possible to add a phase plug to a driver with a vented pole piece? Would it not cover up the vent? If it did, what would be the result? Of course, the frequencies largely affected by the trapped air under a dust cap is probably dependent on the size of the dust cap etc.. but what area of the frequency range is it usually for say.. a 6.5", 8", 10", and 12" mid woofer with average size corresponding dustcaps?
I've been thinking about this a lot lately, as my buyout Eminence Delta Pro 12's sound to ME like.. big plastic cups.. if that makes any sense. As volume levels increase, it becomes more and more apparent. Just for the record, I've only played them by themselves, both free-air and in sealed boxes. Anyway, I'm guessing it's a combination of the kapton former, dustcap, and vented pole piece.. but I'm wondering which of those is contributing to it the most. If I can figure out something to improve upon the negative characteristics of these drivers, I'd most likely end up modifying them a bit.. if only I knew where to start, and the best ways to go about doing it.
An easy experiment would be to stuff the pole vent with some damping material (not a good long term solution as fibres might migrate into the gap).
A phase plug over the vent hole would seal it if secured appropriately, get rid of the vent's oil can resonance, the voice coil's oil can, and improve HF response.
dave
A phase plug over the vent hole would seal it if secured appropriately, get rid of the vent's oil can resonance, the voice coil's oil can, and improve HF response.
dave
ordered 40 pairs of these instead http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=309-160
my plan is to tear them apart and glue drivers by magnets together(bipole), 20x20, no enclosure, just mounting rails.
my plan is to tear them apart and glue drivers by magnets together(bipole), 20x20, no enclosure, just mounting rails.
here they are. all 80 of them. I should have bought more, assembled speakers will be approx 60in high, so there is room to grow.An externally hosted image should be here but it was not working when we last tested it.
they came to approximately 96cents per woofer.
no, definitely not building cabinets. maybe narrow baffles.
I'm still trying to figure out how to mount them.
no, definitely not building cabinets. maybe narrow baffles.
I'm still trying to figure out how to mount them.
An externally hosted image should be here but it was not working when we last tested it.
Quite a promising-looking response from 200 to 2kHz! You could probable put a Behringer DCX2496 to good use in making a nice 2 way, tweaking the response a little, and with an appropriate 15 incher filling in the bottom and those in an open baffle.
Maybe you could just run a 60" piece of 1X6 or 1X8 down each side - perhaps with scallops on the edge at each speaker and perhaps a similar length of 1X2 or 1X3 adhered to the backs of all the magnets to provide fore and aft stiffening.
Maybe you could just run a 60" piece of 1X6 or 1X8 down each side - perhaps with scallops on the edge at each speaker and perhaps a similar length of 1X2 or 1X3 adhered to the backs of all the magnets to provide fore and aft stiffening.
Wow. Yep, I'd try to work from about 2k to as low as possible, altho of course it really just depends on the woofer(s) they're mated with. Probably about 250hz 4th order at the lowest. Could run Alpha 15's all the way down the side, but of course then they'd be pretty wide, and that'd change everything. Looks interesting. Keep us updated with the results.
Also.. hope you don't run into any problems with the foam surrounds in the long run.. or blow them, lol. that'd suck for sure.
Also.. hope you don't run into any problems with the foam surrounds in the long run.. or blow them, lol. that'd suck for sure.
MisterTwister said:
Have you seen the strips of MDF they have at Lowe's, etc.? They come in various widths and lengths with a white primer on one side, intended for siding and trim, I believe. (I've used a 6 (?) inch wide by 8 (?) feet long one for a speaker.) And then go to town with your hole saw.
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