Recent content by selim

Thank you both. JT, I was also aiming for both drivers to be in phase at the XO point but assumed that the mid wasn't out of phase (because of the XO order) and I was surprised to see that it was when you suggested reversing the polarity. Thanks for showing me phase tracking on the graphs. sm52...

Thanks for the explanation. I will check the phase tracking between the drivers. What is your opinion on my current xo order being 4th or 8th? Since the mid and woofer are so far apart and drivers' respective usable upper and lower limits are so close would it make sense to go higher in order as...

JT, I reversed the polarity of the mid. Applied the timing change. The notch is gone. And my measured graph looks almost exactly as yours: A plus B FR Aligned. Thank you. The speaker sounds pretty good right now. Do you have any comments on the overall response graph and what you think could be...

OK, I will try second order as well.

I tried to pick a high enough XO point to protect the compression driver (Beyma CP380m), and low enough to not get into the breakup zone of the woofer. The horn is an Altec 511b that goes down to 500. 2nd order seems to go way into the breakup zone of the woofer and is quite low for the CD...

Thank you sm52. The woofer and mid are crossed at 800 now with 8th order L-R (the woofer has breakup after around 1k. So I thought it best to do a sharp cutoff. Is that a bad idea? The tweeter is crossed at 10k. The mid has no upper XO. Also there is a wide cut filter around 280Hz to flatten the...

Thank you JT, I will try your settings and measure and post it here. I'm curious, why reverse the mid's polarity? My XO's 8th order, and I don't think I connected the mid with the wrong polarities. It must be something you see in the phase graph. Can you please elaborate?

And the second half. Thanks sm52

Here is the first half of the measurements.

Let's try it zipped. It's 23MB. Maybe too big for here.

I don't see the mdat file I uploaded in my previous post. I try to post it here again.

OK, I measured each driver with and without filters XO's on. I also did several full-range sweeps. I think the drivers are time-aligned now. At least they have the same delay value with respect to the reference speaker. Also, there is still a notch at around 800Hz, the crossover freq between...

I still see a big notch at the crossover point. I guess the timing isn't quite right. I'm timing the drivers with an external reference speaker and doing the whole thing again.

I think the impulse is ok now. I think I made a mistake measuring earlier. The thing I don't understand is the impulse before the 0 point. Is that the source signal itself, and the 0-point impulse the actual response? File attached.

Hi, thank you for your reply. I tried posting a reply soon after yours, but I had forgotten to click post. :) Sorry about that: OK, I did that. In fact I even found the delays in the measurement tabs like the following: "Delay 0.7030 ms (241 mm, 9.49 in) using estimated IR delay relative to...