Today I was skimming PE and noticed the Celestion FTX1225 12" Coaxial full range driver. I'm fascinated. I've been interested in doing a coaxial monitor for some time and this is perfect because, well, there's nothing to do. They've put a compression driver into the center of a 12" woofer and somehow designed it so both drivers use the same magnet assembly. Everything's matched and ready to go. I'm thinking this should be fantastic in the nearfield compared to a typical two-way PA/monitor design and avoids the usual pitfalls.
So to build this sucker... I just throw together a suitably sized ported box with a crossover and I'm done, right? I'm thinking I'll run it off a Behringer NU1000DSP which will give me the ability to fine tune the response, and then call it a day. I suppose I should probably stuff it but other than that I'm not even sure what other design considerations to look at.
Celestion recommends a 2 kHz crossover, which I think is unusually high for a speaker of this type. The FR chart also shows a lot of chaos in the tweeter response and I'm not sure if that's a problem. I don't know if a generic passive crossover is a bad idea either.
So to build this sucker... I just throw together a suitably sized ported box with a crossover and I'm done, right? I'm thinking I'll run it off a Behringer NU1000DSP which will give me the ability to fine tune the response, and then call it a day. I suppose I should probably stuff it but other than that I'm not even sure what other design considerations to look at.
Celestion recommends a 2 kHz crossover, which I think is unusually high for a speaker of this type. The FR chart also shows a lot of chaos in the tweeter response and I'm not sure if that's a problem. I don't know if a generic passive crossover is a bad idea either.
That's nothing new. B&C has one too and it has better (smoother highs but woofer has a peak that needs a notch).
http://www.bcspeakers.com/products/coaxial/archive/12cxt.pdf
Off the shelf xo's are mediocre and good results will require you measure and design to adjust the relative SPL levels, have right slope on filter, have notch, shelf, etc. advantage is that it's all in one and speaker is literally anywhere you can but a hole to mount it.
This one by B&C is better overall and will sound smooth and easier to develop a xo for. Recommended 1.2k xo point. It's pricey though - but probably with it.
http://www.bcspeakers.com/products/coaxial/archive/12cx32.pdf
http://www.bcspeakers.com/products/coaxial/archive/12cxt.pdf
Off the shelf xo's are mediocre and good results will require you measure and design to adjust the relative SPL levels, have right slope on filter, have notch, shelf, etc. advantage is that it's all in one and speaker is literally anywhere you can but a hole to mount it.
This one by B&C is better overall and will sound smooth and easier to develop a xo for. Recommended 1.2k xo point. It's pricey though - but probably with it.
http://www.bcspeakers.com/products/coaxial/archive/12cx32.pdf
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