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 Post subject: Fisher XP 6B tweeter replacement?
PostPosted: Mar Sun 03, 2019 10:40 pm 
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Joined: Apr Sun 23, 2017 11:22 pm
Posts: 465
Location: 44035 (Near Cleveland Ohio)
My old Fisher xp6b speakers still sound decent, but the top end just isn't there anymore. Granted, my hearing has gone fishin', but that's all the more reason I'd like to boost up the top end. I've read that the tweeters in these speakers begin to tweet in hushed tones as they age. Any recommendations on suitable replacements? I'd like to have some idea of what I'm getting into before I pry off the grille cloth. . . . .

Dan


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 Post subject: Re: Fisher XP 6B tweeter replacement?
PostPosted: Mar Mon 04, 2019 2:46 am 
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Joined: May Sun 13, 2012 8:12 pm
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Location: Central PA 16801
i would replace the crossover capacitors first.

i have heard so many vintage speakers come to life when the aged crossover capacitors are replaced.

i have seen a few tweeters that were burned out due to leaky crossover capacitors.

there is quite a noticeable difference in the sound when new capacitors are installed.

be sure to use bipolar capacitors. i exclusively use these:

https://www.parts-express.com/cat/cross ... PortalID=1

if a cheaper route is wanted, these can be used too:

https://www.parts-express.com/cat/non-p ... itors/1385

steve

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 Post subject: Re: Fisher XP 6B tweeter replacement?
PostPosted: Mar Mon 04, 2019 12:27 pm 
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Location: Fernandina Beach, FL
Dutch Rabbit wrote:
i would replace the crossover capacitors first.

i have heard so many vintage speakers come to life when the aged
crossover capacitors are replaced...
steve

I will have to second that suggestion. Famous for going open are the
crossover capacitors in KLK Model 17 speakers.
I have replaced many of them.

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 Post subject: Re: Fisher XP 6B tweeter replacement?
PostPosted: Mar Mon 04, 2019 5:50 pm 
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Joined: Apr Sun 23, 2017 11:22 pm
Posts: 465
Location: 44035 (Near Cleveland Ohio)
Thanks Steve & Don. I'd forgotten about the crossover caps - serious brain cramps. Years ago, I built several crossovers for home-built Voice of the Theater "clones", hand-winding the chokes. I remember using huge mil-surplus oil-filled caps back then. (I wish they had WhackyWood back in the '60's. Would have been much easier forming the throats!)

I ordered the caps from Parts Express - they've always been a good speaker source for me. I went with the n/p electrolytics. I opened one speaker up, and each crossover uses a 15uf & 18 uf @25volt. For the 18 uf, I'll use a 15 and 2.7 in parallel; should be close enough. If these were "high-end" speakers, I'd have gone with the better caps though.

Thanks for stirring up my gray cells - as Hercule Poirot used to say. :D

Dan


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