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In Reply to: RE: Supertweeter recommendation for open baffles.... posted by Waxxy on March 13, 2012 at 08:42:13
Other than the obvious lack of performance in the upper frequency range, what do you want to accomplish? This is the main question.
If you're doing an open baffle, you're going to have "room-filling" sound with very wide dispersion at low to mid frequencies and a large amount of ambient sound, so it would make sense to compliment that with a wide dispersion tweeter, or maybe even multiple tweeters facing different directions.
While I'm a big fan of the E-V T350, I don't think it's the answer for this design, unless you plan to remain pretty much on axis and don't care what the other people at the party hear. ;)
And let's be frank: No 12" cone driver is good up to 10K for hi-fi. Too much mass. (I'd also say too directional, but you're doing an open baffle, so that might not be an issue.) It's a bit like trying to run a 1" tweeter down to 500 Hz.
So, the question is how do you envision the sound field in the room, and where do you want it to sound great? THEN you can choose your tweeters. (I'd also cross to them more around 3KHz than 10KHz. Better yet, get a midrange driver, too. And maybe a sub.)
Follow Ups:
My main goal is to fill in the frequencies where the main drivers start to roll off...which according to measurement charts I've seen online is somewhere around 10 000 hz.
I'm not going to add a midrange or cross it over at 3000 hz because the whole idea (for me) is to run the main driver full range (no x-over) and fill in the ultra highs with a super-tweeter.
The EV-T350 is interesting, but the prices are beyond what I want to spend for this experiment. I realize this project may not be considered the highest of fi, but I've got a modern set of hi-fi speakers (ProAc) and I'm wanting to try something radically different.
Waxxy
8 ohm, but if 94dB should be very close to your 12's.
Maybe buy 4 to play around with in case they are lower than 94dB?
Read down the comments about shorting with a resistor and using a cap to cut off LF's.
I'd start with a 2MF cap which should put you @ around 10K Hz.
The higher the cap value the lower the tweeter will go and visa versa.
Of course you can also try them without a cap.
Very cool...thanks! At that price, I'd be stupid not to try them!
Waxxy
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