evdplancke;691794 Wrote: > I am using quite old vintage AT1 speakers from PE Leon. These are two > ways bass reflex floorstand speakers and I am quite happy with them. > However, one of the tweaters has been damaged by a chair and is a > little bit disformed. Probably due to this, I noticed with Audiolense a > drop in frequency response above 13 khz on one channel that is not > corrected by the RC filter. Strange is that this drop does not seem to > have an impact on soundstage integrity without RC. > > Without RC, I have the most realistic image when my head is let say at > 30 cm from the back wall. Unfortunately, I did last measurements > further from the wall and this might be why the result is not that good > with RC. > > Another strange result is that I get a delay of 1.6 ms between > channels. Given this corresponds to a distance of 0.5m at the speed of > sound, I suspect difference in mic distance from each speaker is not > the main cause of the delay. Can phase shift between channels due to > wrong mic orientation be the cause? Again, if I have a good soundstage > without RC, wouldn't it be better not to compensate for the delay? I > will give it a try.
Now you are talking ;-) PELeon? I know it very well. I used to have the Intégrale but get bored of the HiFi sound and went high efficiency and horns way. You speaker is two ways. The impulse response and the delay are established following the highest peak. This peak is dominated by the tweeter. If one of the tweeters doesnt work well, the calculated delay is false and applies only to the tweeter. The woofer which plays more than half of the sound is not well corrected/aligned to the tweeter. As I said, sound image should be much more focused after the DRC correction because speakers get time aligned and phase corrected. Try this: change the frequency range of the measurements and measure woofers and tweeters separately, observe the calculated delay. Are they the same? 1.6 ms is a lot of misalignment, not normal for equidistant speakers. Something is wrong. DRC is very precise in spot correction but the measurements have to be good enough. Chris -- krzys ------------------------------------------------------------------------ krzys's Profile: http://forums.slimdevices.com/member.php?userid=2256 View this thread: http://forums.slimdevices.com/showthread.php?t=93393
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