Oh my god, it's a sibilant tweeter!! Those are my bane, I have a tendency for Tinnitus and sharp sibilants just trigger it. It's the worst sound signature there is imo.At the same time, female vocals had very sharp extensions that were almost painful to listen to. This would come and go of course as the singing went along.
I played with EQ but after a while I gave up. Strangely no matter what I did, I could not get rid of the brightness in vocals. I did bring down the upper bass and lower mid-range level and that mostly helped but then it exaggerated the highs.
A sibilant tweeter is simply an evil, ringing mess. If something doesn't show up in measurements that simply means the measurements are not exhaustive enough, not that you can't measure it. We don't have a laser-inferrormeter or like Bruno Putzey said, he has a test battery of around 20 measurements that enable him to exactly replicate any amp-sound he wants. Our own testing battery isn't even close to that. But it doesn't matter because we aim for "specs so good the unmeasured stuff doesn't matter" anyway.
Don't forget that no speaker is "pure" (yet) so you always have sounding components.
Amir, if you still have the speaker, could you try something? Just brutalise the resonances at 1.5 and 5kHz. Like 15dB down. No mercy. Yes, it will of course completely mess up the frequency response and everything sounds wonky but the test is, will this get rid of the sssssssst?
edit: Actually, try only the 5kHz ringing first. That should be enough. For those wondering why: we are doing what in recording is called De-Essing. If you played back songs in a DAW you could probably load up a De-Esser and treat the tracks in a way that they just sound right on the SVS.
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