CX120-8 easy build

[cjbruce]

That's good to hear. I've been playing around with a bunch of 3D printed boxes for a single TEBM46 driver and I can't get a satisfactory sound with a crossover below 160 Hz, even with a WinISD-tuned box at 110 Hz. The 2" BMR just seems to be too small to make it work. I have a good feeling about the CX120 though. Its a small room with low ceilings and we keep the volume low during movies.

[cjbruce]

Here's the initial design sliced for 3D printing.

I'm planning to mount the crossover board in the slot against the left wall. The top and bottom will be made of an as-yet-undetermined hardwood, depending on what we have in the shop.

[djg]

Good luck. I used the YPAO mic with my Yamaha AVR, ended up changing the YPAO derived settings. 100 hz should be fine.

[cjbruce]

Parts came in for the CX120-8 Easy Build today. Over the next few weeks I’m hoping to 3D print and cut parts for a 3.2 liter ported version. They will initially be mounted in 9” deep bookshelves as LCR channels for a 100” pull down screen. They will be crossed over to an RSL Speedwoofer sub at around 100 Hz. I will be using a Yamaha TSR-700 AVR to drive them. I don’t have a calibrated mic, so I will be equalizing using YPAO and my ears.

[cjbruce]

This looks just about right for a small home theater. Nice work!

If you don't mind my asking, at what frequency are you crossing over to the sub on your AVR? I have some 0.8 liter 3D printed boxes for the TEBM46 2" BMR that sound decent crossed over at 160 Hz on the AVR. I was hoping that I could use the CX120s to go a little lower with boxes only a little larger, perhaps to a 100 Hz crossover?

[davidB]

If you are putting them in-wall, you can look at the spec sheet off-axis plot, as it is done on a large, flat baffle.

Remember to use Bob's lower bsc values in the crossover.

[djg]

The CX120. I've never seen a CX150 design.

[Steve Lee]

Did you use the CX120 or CX150's - you weren't specific concerning the parts from Meniscus - will BobinGA's XO work for both speakers? (120 & 150)

[cjbruce]

Thanks for the great design! I'm looking to create a set of in-wall enclosures to put behind an acoustically transparent screen, but due to a strange concrete foundation wall and a low ceiling I only have 0.5 cubic feet to work with. I also need something with off-axis response consistent out to 45 degrees. By any chance have you taken off axis measurements?

[djg]

The final dimensions were influenced by the size of some leftover plywood pieces, but they worked out very well.

[BOBinGA]

I’m glad you like them. I measured them both horizontally and vertically and there was not a lot of difference, so they can be used either way. Your layout should work great.

[djg]

Yes, his XO, cab size and port, manipulated into a deeper shorter size. I did add 1/2" to the width to allow for a roundover, as BOB minimized the width (height) for his center channel use.

[wogg]

Those are sweet! Did you use Bob's crossover schematic?

[djg]

So these things really impress me after a few minutes of listening. Really the first coaxial design I've heard. For about $100, recommended if Dayton still sells these drivers. Even I can hear the precise imaging.

[davidroberts]

Yes it would be really nice to be able to purchase the S2000 woofers individually and use the coax in WCW arrangement for the center and CWW arrangement for the L/R in a soundbar.

I haven't found anything else that uses that same frame or basket.