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In Reply to: RE: it's so hard justifying fixing them when they ain't broke posted by sober1 on March 05, 2014 at 12:12:33
No, sober 1. Put a 4.7 uf on the lower tweet, & a 2.2 uf on upper tweet. On Sansui's SP-2500, tweet control had provision for either 4.7 uf or 2.2 uf x-over eq. Decided to try 4.7 uf on lower tweet, & 2.2 uf on upper (whilst bypassing tweet control). Been sounding-n-working like proverbial charm past six years (thanks once again to Vintage Karma's Robisme for 2500s). Those Mesa/Jensen P-10RI's sound delightful with simple 4.7 uf x-overs on Motorola piezo tweets in ESS Model 10 cabs. A 2.2 uf on upper tweet should add a subtle treble sparkle to your Heath AS-10's alnico magic. 73s para Sactown.
Follow Ups:
you're talking paralleling the individual tweeters with these caps? and if so, what effect will this have on these already paralleled tweeters? now replacing the single 3MFD cap that is now in series with these paralleled tweeters with a 4.7 cap to first tweeter, then a 2.2 in series on positive lead between first and second tweeter makes more sense to me. Now we have changed the xo point to tweeters and created a xo point for the second tweeter from the previous paralleled tweeter xo point.
Or, do I have this ass-backwards?
"the only thing necessary for evil to succeed is for good men to do nothing"
Correct, sober 1. You're replacing stock 3 uf with two separate caps with two different x-over points. Roughly 4,229 hz for 4.7 uf cap, & roughly 9,034 hz for 2.2 uf cap. Jensens have smooth bass-to-midrange tonal transition, and the 4.7 uf cap integrates tweet response near the Jensen's upper frequency range (which is usually around 5 khz; btw, Sansui's two-way AS-100 speakers use a single 4.7 uf x-over cap with their Coral alnico drivers). You'll get sparkle from the 2.2 uf cap on upper tweet. Changed 3.3 uf x-over caps in a pair of Cerwin Vegas to 4.7 uf, which are paired with 12" replacement Electro Voice Forces (stock Pyle Drivers were shot). EV Forces have a frequency response up to 7 khz, but stock CV tweets just sounded better with 4.7 uf x-over caps. This retired printer was raised as an efficiency fiend, with a guitar-slinger's "get thy tone from thy amp" mind-set. Your Heaths already sound exquisite as is; merely suggesting a little tonal sweetening of their alnico magic. Try modding one speaker & compare it to stock. Difference should be quite an ear opener. 73s para Sactown!!!
will do, though it might take a couple of days once I get some caps. cap type/brand suggestions?
"the only thing necessary for evil to succeed is for good men to do nothing"
Dayton Audio 1% PMPC polyprops should suffice, sober 1, & you can conveniently order them through Amazon. If you'd like some auld-skool sparkle, try NTE metal films. Either way, your Heaths will sound as beautiful as they look. 73s para Sactown.
I think I will give the film caps a go. Thanks man.
"the only thing necessary for evil to succeed is for good men to do nothing"
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