Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site ncrcae.UUCP
Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!ncsu!ncrcae!markmc
From: markmc@ncrcae.UUCP (Mark McCulley)
Newsgroups: net.audio
Subject: speaker mod results
Message-ID: <2110@ncrcae.UUCP>
Date: Fri, 15-Feb-85 08:32:12 EST
Article-I.D.: ncrcae.2110
Posted: Fri Feb 15 08:32:12 1985
Date-Received: Sun, 17-Feb-85 05:40:49 EST
Organization: NCR, Columbia, SC
Lines: 29



>                                                           These
>speakers have potentiometers to control a +/- 3dB boost/cut on both
>the tweeter and midrange driver.  I am considering replacing these with
>fixed value resistors.  Please mail (or post if you think it is of
>a general interest) any suggestions or comments.  BTW, the speakers
>are Yamaha NS690.

	Last week, I removed the potentiometers and replaced them with
discrete resistors.  The upgrade was *considerable*.  Those pots were 
FULL of 'grungeballs' :).  After I made the mods and first listened to
the system, I thought something was wrong - it was the next day before
I realized that I had been missing a lot of the music.  I don't know
how much improvement could have been realized by just cleaning the wipers
and leaving the pots in the circuit, probably a good deal, but I don't
want to have to periodically clean them, and I don't use them anyway.
This was certainly a bigger upgrade than any from equipment changes, and 
it was FREE (about an hours work with a soldering iron).  I would certainly
recommend that anyone having speakers with potentiometers investigate
this modification.  Hmmmm, I wonder about the pots on my preamp...?


					Mark
					...decvax!mcnc!ncsu!ncrcae!markmc

-----------------------------------------------------------------------------