I'm back to a CC design after a couple weeks. Thought I had it, bought the parts, built the XO. DIdn't measure anything like the mock-up with parts out of the parts bin... Fought with it for a little while and decided to take a fresh set of measurements. Somehow, both the woofer nearfield and tweeter (in its entirety) measured (and sounded) quite different. I gave up on the first design and started from scratch - these measurements were entirely repeatable.

Seas W18E001 - OW2/MDM55 - Seas W18E001.

Box is 22.5x9x13 with a 1.5" front baffle. Should be 27.7 gross L (assuming I did the math correctly), call it 25L net when everything is in. Sealed.

It needs a final tweak, but I'm having trouble getting past the extremes.

Regarding the low end, did I miscalculate something when modeling the box? I did a nearfield measurement of 1 woofer and the 70Hz bump seems very real. My room is 16 feet wide in 1 direction, could that somehow be the room? That isn't the whole issue in the low end - its still higher than I expected in 100-200Hz region.

Regarding the high end, the OW2 has a bit of a bump above 10K, and it's definitely showing up. I'm sure I could notch it out, but is there an easier way? I tried throwing a little .05mH coil across the padding resistor in front of the crossover, but that seemed to lift the whole response somehow, not what was simulated. I've used a cap to lift dropping top octaves, stood to reason that the opposite should work with an inductor.

W-M is 4th order acoustic, M-T is 2nd order acoustic (yes, tweeter is wired backwards).

I'd welcome any thoughts. Thanks!

.

Seas W18E001 - OW2/MDM55 - Seas W18E001.

Box is 22.5x9x13 with a 1.5" front baffle. Should be 27.7 gross L (assuming I did the math correctly), call it 25L net when everything is in. Sealed.

It needs a final tweak, but I'm having trouble getting past the extremes.

Regarding the low end, did I miscalculate something when modeling the box? I did a nearfield measurement of 1 woofer and the 70Hz bump seems very real. My room is 16 feet wide in 1 direction, could that somehow be the room? That isn't the whole issue in the low end - its still higher than I expected in 100-200Hz region.

Regarding the high end, the OW2 has a bit of a bump above 10K, and it's definitely showing up. I'm sure I could notch it out, but is there an easier way? I tried throwing a little .05mH coil across the padding resistor in front of the crossover, but that seemed to lift the whole response somehow, not what was simulated. I've used a cap to lift dropping top octaves, stood to reason that the opposite should work with an inductor.

W-M is 4th order acoustic, M-T is 2nd order acoustic (yes, tweeter is wired backwards).

I'd welcome any thoughts. Thanks!

.

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