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Path: utzoo!watmath!watdcsu!herbie
From: herbie@watdcsu.UUCP (Herb Chong [DCS])
Newsgroups: net.audio
Subject: Re: modifying speakers
Message-ID: <928@watdcsu.UUCP>
Date: Sat, 9-Feb-85 14:13:44 EST
Article-I.D.: watdcsu.928
Posted: Sat Feb  9 14:13:44 1985
Date-Received: Sun, 10-Feb-85 05:17:58 EST
References: <2104@ncrcae.UUCP>
Reply-To: herbie@watdcsu.UUCP (Herb Chong [DCS])
Organization: U of Waterloo
Lines: 46
Summary: 

In article <2104@ncrcae.UUCP> markmc@ncrcae.UUCP (Mark McCulley) writes:
>
>	I'm thinking about modifying my speakers and would like to hear
>some feedback from anyone that has had success (or failure) with this
>before.  I'm not going to do anything 'drastic' like redesign the
>crossovers yet, just upgrade components for now.  What I plan to do
>now is rewire with Kimber (sp?) cable, replace the capacitors in
>the crossovers with some high grade polypropylenes, maybe try bypassing
>the caps with .01 uf's, and put in some bigger binding posts.  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.
>
>					Mark
>					...decvax!mcnc!ncsu!ncrcae!markmc
>
>-----------------------------------------------------------------------------

i own a pair of B&W DM7 Mk2's and i have modified my speakers by
rewiring(using Fulton Brown) and changing the input connector board.  i
have not touched my crossover network because there is also a complete
electronic protection circuit builtin.  i may do so some day, but since
i have only two electrolytic capacitors in my network (the rest are
polypropylene), it's not a major change.  the other thing that i did
was apply silicone rubber to all joints to ensure they were properly
sealed.  also, you may consider adding bracing to the cabinet.  the net
gain is greater speaker efficiency in the lower registers.  other
changes are not so apparent, but slightly better midrange clarity was
also noticed in my speakers.

i have disassembled a pair of Yamaha NS1000M's and the crossover network
contains all polypropylene capacitors and 16Ga wire.  since the NS690's
are next down, i would expect the wire to be pretty good and you may not
notice as much difference as i did.  the original wiring in my DM7's
was 20Ga.

Herb Chong...

I'm user-friendly -- I don't byte, I nybble....

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