PE 12" co-ax

[troystg]

Hi all-

I did a couple of searches that didn't turned up anything but I didn't really know what to search for. Sorry if this has been asked before.

I just ordered a pair of the PE 12" co-ax speakers

http://www.parts-express.com/pe/show...number=299-450

and I was looking to see if anyone has done anything with them.

They appear to be Eminence drivers but that is a guess.

My intention is to use them from 250Hz and up in a one cubic foot sealed box with a 12 db xo @ 2-2.5KHz.

This is for music in a warehouse, not home or DJ type use.

Any and all suggestions would be appreiciated.

[Brett]

Why not? For $50/ea can you go wrong?
Anticipated xover freq might be a bit high.

[MisterTwister]

that looks like an oem version of B&C 12CXL
same frame and surround.

[Pano]

I think you're right! Knew they looked familiar.....

I sure was tempted at that low, low price.

[BHTX]

T-S parameters for the woofer are much different than the 12CXL tho..
If the specs of that coax are anything like PE has posted, don't expect much more than 90-91 dB/watt from that woofer.

[adason]

hi troystg,

if you only plan to use them from 250Hz up, you might as well put them on open baffle
I tried that with Sammi coax (there is a thread somewhere here), and the result was much cleaner sound than in closed box

good luck!
ed

[troystg]

Sorry for the delay, I was out the last couple of days traveling.

Yes they will be crossed over to woofer cabs, the 250Hz is a guesstimate. Anywhere from 100-500Hz would be good.

My concern is a crossover that cost more than the woofers. This is a warehouse speaker so sound is not critical.

Also would OB be wise in a warehouse? How big would the baffle have to be?

The system consists of a stereo source feeding a box that sums the channels, volume pot , electronic XO @ ~250Hz, feeding a Crown CL1 amp. channel 1 is four Eminence 15" woofers 250 and down, channel 2 is (will be) these two 12" co-ax speakers. Note it is mono since there is no sweet spot, and it is just jam music while people are working.

[adason]

troystg, you can use speaker grill to protect speaker on open baffle from front and back
the only reason why I suggested open baffle is that it will befinitely sound better in midrange area, however, there might be other issues
250Hz seems a little too high for subwoofer localization issues
for such high crossover frequency you almost need two subwoofers placed close to midrange section
in any case, the baffle does not need to be big, see bastanis speakers or those I made, I am very happy with the results
crossover was not that expansive if you use resistors instead of L-pad
coaxial
if you do not like open baffle, this might be the way to go
http://gallery.audioasylum.com/cgi/v...&w=1544&h=1158
ed

[BHTX]

Hi adason!
I remember that Sammi coax very well, never had them myself though.
But I remember your previous posts about them, as well as that picture. I even had that pic saved on my drive for a while at one point, lol. Now I have it again haha. What woofers were those? They're crazy looking.. in a good way.

[troystg]

adason-

Thank you for the comments, replies and links.. Neat to see. Your Maserati?


"Also would OB be wise in a warehouse? How big would the baffle have to be?"

What I was referring to here was not the security of the drivers, but the front and back wave cancellations. Both the woofers and tops will be in the center of the warehouse toed in crossing each other and playing to the back rear corners. I assumed that open baffle drivers worked better in corners or near wall boundaries. In this application they would be essentially free air.

I should have rx'ed the 12's today (I am traveling now, will be home tomorrow) and I also bought a set of the Eminence Alpha 8" and Selenium compression driver / horn. I hope to play with both solutions this weekend and decide which to use next week. I will photo and chronicle along the way.