@mirolab ,
One more trick you can do, if you know a few words in a thread's heading. Go to google and type like this:
"equaliser in a hifi system" site:audiogon.com
I purposely made the spelling mistake in "equalizer". But Google got me THIS thread as the FIRST hit. That last part is very important. "site:" followed by the specific site you want to search. You might be aware of this, but I thought this might help others.