Originally Posted by tuxedocivic
Ok, here is a measurement that's been gated. I really looks artificial below ~1500hz. Should I move the gate out further? 3ms is about 120cm? 340000cm/s / 120cm = 3.4ms
You've got a lot of experience with Holm Impulse I think Penn. I'd appreciate the feedback on this one.
The gating looks good for use in x-over work. I usually have mine at 500 hz, but sometimes, depending on how I set my speakers up to measure, I can go lower. You will get the same results as far as the x-over goes, only maybe a little more detail down lower in frequency. When you measured, did you place the speaker on a stand away from walls as far as practical? If you can get the speaker 4 or 5 feet from anything, that helps a lot. You can usually see the first reflection in the impulse response.
Like this. This test was lowpassed to make the high spl more tolerable. Even with earplugs, it was annoying. The test was for distortion. (Not shown.) For x-over work I test at lower spl, but still use the earplugs.
See the spike just to the right of the gating setting? That's my first room reflection. You may have to zoom in on the impulse graph to get it to where you can see it easily.