I'm working a 3-way floor standing speaker. I've built the enclosure and installed all 3 drivers. I'm at the point of measuring the frequency response to create the FRD files for crossover design using Xsim. However, I'm confused about what I've found for adjusting z-offset. I read several posts discussing this and have determined I need to create 7 FRD files. One each for the stand alone drivers, one for the Tweeter + Midrange, one for the Woofer + Midrange, one for the Tweeter + Woofer, and one for all 3 drivers in parallel.
Part of my confusion is from a post from Bill Waslo stating one needs to create 5 FRD files (Not 7). The two he is not using is the Tweeter + Woofer and the one having all 3 drivers in it. If seven files are really necessary, how do we use the two "extra" FRD files? Are we adjusting the tweeter and woofer FRD files more than once?
Another point of confusion centers on a statement suggesting you adjust the Midrange driver mod delay using the Tweeter + Midrange FRD file. Shouldn't we be adjusting the tweeter mod delay leaving the midrange untouched? I was under the impression that we're referencing both the tweeter and woofer to the midrange so no z-offset is necessary for the midrange. Is that correct?
Finally, one post mentions that the measurements should be made using 1/48 smoothing. I assume I'll find that option in my Omnimic software, but the post continues on to suggest that the driver tuning dialog box in Xsim defaults to 1/24th smoothing when importing all FRD's, regardless of the FRD's native resolution. This implies that to keep 1/48 smoothing all FRD files would need to be manually changed from 1/24 smoothing to "none". However, I do not find the option to change the smoothing in Xsim. Am I just missing it or did Xsim change this feature with a software update?
Part of my confusion is from a post from Bill Waslo stating one needs to create 5 FRD files (Not 7). The two he is not using is the Tweeter + Woofer and the one having all 3 drivers in it. If seven files are really necessary, how do we use the two "extra" FRD files? Are we adjusting the tweeter and woofer FRD files more than once?
Another point of confusion centers on a statement suggesting you adjust the Midrange driver mod delay using the Tweeter + Midrange FRD file. Shouldn't we be adjusting the tweeter mod delay leaving the midrange untouched? I was under the impression that we're referencing both the tweeter and woofer to the midrange so no z-offset is necessary for the midrange. Is that correct?
Finally, one post mentions that the measurements should be made using 1/48 smoothing. I assume I'll find that option in my Omnimic software, but the post continues on to suggest that the driver tuning dialog box in Xsim defaults to 1/24th smoothing when importing all FRD's, regardless of the FRD's native resolution. This implies that to keep 1/48 smoothing all FRD files would need to be manually changed from 1/24 smoothing to "none". However, I do not find the option to change the smoothing in Xsim. Am I just missing it or did Xsim change this feature with a software update?
If you measure while preserving measurement timing, the delay will be included in the measurement. Otherwise this workaround is needed.
It reads as though the 1/48 is in series with the 1/24.
You're using omnimic so you're correct that you need to find the offsets. You only need the 5 that Bill suggests.
Okay, thanks. I'll adjust the tweeter and woofer mod delay and leave the midrange alone and won't bother measuring T+W or T+M+W.
As for smoothing, I'm still confused. I guess I can just ignore.
As for smoothing, I'm still confused. I guess I can just ignore.