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alexmoose 18th May 2007 08:57 PM

Sibilance Distortion on SMGs
 
hello everybody,

The Maggie rebuild is going along, however in preliminaty listening I keep getting Sibilance distortion out of both channels at high volumes. What could be causing this???

Thank you

-Moose

bigwill 19th May 2007 01:39 PM

Might be the amp.

bear 19th May 2007 02:30 PM

Suspect everything.

Not sure what ur rebuild is about, but if you redid a section that does HF, check the impedance curve vs. the old stock impedance curve!

Better still do an FFT of the response. Look for a clear resonance.

Someone I know had a pair of maggies with the ribbon tweeters, and when we changed the speaker cables to another brand (BEAR Labs) most if not all of the sibilance issues he had went away. Why that should be, dunno. But it did.

We were not hypnotized, delusional or easily led. Not subtle.

_-_-bear

alexmoose 19th May 2007 04:29 PM

I rebuilt the tweeters a couple of months ago, (semister Break) now that the Year is done, a friend and I are tackling the Mid-Bass Wires.

After posting this, I looked up the many causes of Sibilance distortion. oh lord! so many causes I think I am going to change from my HK3480 to A Citation 19 in a day or so, which should give a real demonstration of what these speakers can do. so I will check these things off one by one.

Right now, Listening to Billy Joel's 52nd street on Original Vinyl, The Sibilants have extreemly little distortion (if any at all). I am starting to think that maybe it is the gratuitous DSP in CDs, and on Ipods and Such. I hate to Bash CDs, but its looking like that aggravates the problem.

bear 20th May 2007 03:58 PM

Your CD chain can certainly make nasty things happen in the highs.

Wondering what you used for the foil for the tweeters?
If it was not the right alloy and thinness, you may have a resonance "in band"...

_-_-bear

alexmoose 21st May 2007 09:21 PM

the tweeters are not Ribbon, they are Aluminum wire.

I think the distortion is caused by a reaction between the CDs I own and the tweeter. It varies from CD to CD, and some are clearly worse than others.


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