Project: Bauxite

[spasticteapot]

I have a pair of Neo3 tweeters, but I'd like to go a step above and beyond the Dayton RS180's used in the Cryolite in favor of a Seas CA18RNX/P (CA18RNX with a L18-style phase plug). These should allow for a higher crossover point.

(Yes, I'm trying to rip off these: http://www.partsexpress.com/projects...xmonsters.html)

Also, I'm going active - no passive crossovers here. I'm hoping to find some old Alesis amplifier modules to use, but I can build my own if necessary. (I just need a lot of op-amps for those pesky filters...)

Finally, the cabinets are going to be cast concrete. You heard me right: concrete. I think I have the hang of casting the stuff, and it allows for custom chambers for the Neo3, in addition to waveguides and whatnot. (Also, I can add deflex panels without spending a bunch of money on them.)

The name is somewhat random; all I remember about cryolite is that it's used to dissolve aluminum from bauxite.

Any thoughts, folks?

[cjd]

Have fun?

Not sure how "up" the CA18 is but not a bad driver to be sure.

C

[spasticteapot]

Have fun?

Not sure how "up" the CA18 is but not a bad driver to be sure.

C

"Up"?

[cjd]

How much a "step above"

Sounds like a fun project regardless.

[spasticteapot]

Drivers should be on the way soon.

Anyone have any tips for how I should configure the Alesis modules I'm getting for it?

[AJINFLA]

I have a pair of Neo3 tweeters, but I'd like to go a step above and beyond the Dayton RS180's used in the Cryolite in favor of a Seas CA18RNX/P (CA18RNX with a L18-style phase plug). These should allow for a higher crossover point.

Also, I'm going active - no passive crossovers here. I'm hoping to find some old Alesis amplifier modules to use

Step beyond the Dayton with the SEAS? Higher crossover point? If you are referring to the M1 modules (that Apexjr had), those are 1.5k XO. 8th order (electrical or acoustic not stated IIRC).

Being tailored for a specific Monitor design, it may or may not have baffle step correction. How will you account for this? There may be delay compensation for the tweeter (z-axis) built in. Flat baffle like the original (and unlike the PE example) should get you close.
Measure, measure, measure...then build and measure some more. Good luck.

cheers

AJ

[spasticteapot]

Step beyond the Dayton with the SEAS? Higher crossover point? If you are referring to the M1 modules (that Apexjr had), those are 1.5k XO. 8th order (electrical or acoustic not stated IIRC).

Being tailored for a specific Monitor design, it may or may not have baffle step correction. How will you account for this? There may be delay compensation for the tweeter (z-axis) built in. Flat baffle like the original (and unlike the PE example) should get you close.
Measure, measure, measure...then build and measure some more. Good luck.

cheers

AJ

There are detailed guides to hacking the Alesis modules - It's not hard to move the xover point up to 2.75 khz.