I tried the new Hantek scope, and tried to do an alignment using my calibrated microphone, held by a vibration isolator and a music stand (it might or might not have been better to have the correct adapter to mount the mike directly to the stand).
I could do a fairly good job aligning the sub and the panel on each side, but problematically I could not set the delay differently for each channel on either the subs or the panels. I do not understand why, it looks like this adjustment should be possible somehow but it isn't, even on the subs, for which the DEQ is in dual mono mode. So I had to pick a compromise, which still shows pretty good blending of the panel signal into the bass signal. This is not entirely unambiguous on the scope at the finest resolution of 0.01ms.
With the super tweeters, I could not get a clear signal off axis or more than 2 feet from the super tweeters. (On my iPhone using Analyzer from Onix3, I see the supertweeter output clearly from 4kHz to 20kHz...the former greatly attenuated fortunately.) So I could not do the alignment other than by guesswork. I could hear some differences using the single positive pulse (dirac, I think it's called) test signal, but I didn't know which was more like correct in the critical range of 6.26ms to 8.5ms relative to 10ms added delay for the panels. Sometimes I preferred the former but recently I've switched to something like the latter, which I think is more correct. )
I think this was partly because the Hantek scope I has has a fan, which was creating enough low level noise to possibly mask the supertweeter pink noise output.
Previously, my old fanless Tektronix didn't seem stable enough anymore. But as it turned out, even with the Hantek, I needed to tap off the preamp signal to the trigger input. I could posslby get the Tektronix to work for this work, or get another fanless scope.
I could do a fairly good job aligning the sub and the panel on each side, but problematically I could not set the delay differently for each channel on either the subs or the panels. I do not understand why, it looks like this adjustment should be possible somehow but it isn't, even on the subs, for which the DEQ is in dual mono mode. So I had to pick a compromise, which still shows pretty good blending of the panel signal into the bass signal. This is not entirely unambiguous on the scope at the finest resolution of 0.01ms.
With the super tweeters, I could not get a clear signal off axis or more than 2 feet from the super tweeters. (On my iPhone using Analyzer from Onix3, I see the supertweeter output clearly from 4kHz to 20kHz...the former greatly attenuated fortunately.) So I could not do the alignment other than by guesswork. I could hear some differences using the single positive pulse (dirac, I think it's called) test signal, but I didn't know which was more like correct in the critical range of 6.26ms to 8.5ms relative to 10ms added delay for the panels. Sometimes I preferred the former but recently I've switched to something like the latter, which I think is more correct. )
I think this was partly because the Hantek scope I has has a fan, which was creating enough low level noise to possibly mask the supertweeter pink noise output.
Previously, my old fanless Tektronix didn't seem stable enough anymore. But as it turned out, even with the Hantek, I needed to tap off the preamp signal to the trigger input. I could posslby get the Tektronix to work for this work, or get another fanless scope.
