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In Reply to: RE: June Stereophile - anyone else have a problem with HR's Fern & Roby amp review? posted by DustyC on May 24, 2024 at 08:32:30
I suspect you're talking about the Audiovector speaker. Surprisingly, that notch, although likely audible, might not be as noticeable as it looks -- particularly compared to if it went up instead of down.
That said, I'd like to get my hands on that in the chamber we use and move the microphone around and see if it's some sort of phase issue that has to do with the microphone placement -- or if it fills in elsewhere.
What's also surprising is above and below that notch, the response looks really well behaved. So it could be some sort of cancelation happening, but it could also be that they prematurely curtailed the response above and/or below that region for some sonic reason.
Doug Schneider
SoundStage!
Follow Ups:
"particularly compared to if it went up instead of down."
Quite true! In fact the ATC-40's at work have a good size notch in the response up high but what you hear is not the notch but the sparkle of the hf driver as the response resumes above the notch.
for sure, this is NOT what one wants for mixing a recording, that is ideally neutral and flat.
Keep an eye out for a set of Klipple measurements for that speaker, those are becoming mainstream popular. Those show "where the sound goes" over the sphere quite well and doesn't require a chamber.
I use it even for crossovers some times, take the average anechoic mag & phase response over say a 10 degree or 20 degree cone on axis instead of one point.
Tom Danley
. . . may be a "design feature" rather than an error. I recall some implication in the article (I'll have to read it again) that it is intended to reduce vocal sibilance. JA determined it was NOT a phase cancellation (it was still there when he flipped the polarity of the tweeter), and the other Audiovector models he measured did not have it.
The audible effect is easy to simulate, if you have some reasonably flat-measuring speakers and an EQ. Just cut an 8dB notch, about half an octave wide, centered at 3kHz, and listen. I hear a discontinuity in the treble, as if the upper harmonics are not properly attached to their fundamentals. But it does reduce sibilance on "hot" recorded vocals.
Hi,
One thing I wanted to add is that sibilance is generally higher in frequency -- 4 to 10Hz range. I think whatever is happening at the 3kHz range -- if that notch doesn't clear itself up somewhere -- is to try to get the best blend of drivers that perhaps don't blend that well. But that's a guess.
Doug
SoundStage!
Better to have a ruler flat response and let the listener apply EQ to tame any frequency anonomly.
If you notch out that region, yeah, that's going to reduce. I'd still like to play around with microphone positioning.
But on top of that, midrange-bass drivers break up at the top of their range, tweeters at the bottom. Early cutoffs of the drivers can be to reduce that, too. I'd like to see a distortion test to see if something is happening in that regard.
Doug
SoundStage!
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