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Speaker Re-cap. How do you know when?

Howdy. Looking for input on speaker capacitors & their life span. I have a set of Infinity Renaissance 90's and the bass seems to be thinner than it used to. Thinner meaning not as strong, feel it in your chest type bass. The speakers go down to 27hz, so I know form the specs and experience that it can happen. Reason I am asking about the capacitor, is "back in the 70's", I had a pair of Pioneer speakers that occasionally would literally blow the insides out of a cap. I'd go to Speaker City grab a new one & solder it in till she blew again.
Question; Is there a chance the caps are old & hammered or am I searching the wrong area? What have you folks experienced? Are there even caps in the woofer cross-over’s?
Speakers are powered by Krell KCT pre & Krell FPB300cx.
PS - The surrounds look like new.
Thanks for any input and advice.
-John
jsd52756

Showing 1 response by glmccall

glmccall
6 posts
 
If the bypass cap on the woofer is blown then the woofer is more like a Full Range driver then a low frequency driver.
If you want to send me a copy of the schematic I can help you with the parts. My hobby is updating crossovers and having the schematic is half the battle! I have updated a pair of JBL L300s, a pair of Altec 19s and two pairs of Dahlquist DQ-10s. I am currently updating a pair of JBL 250Ti’s.
Sonic Craft Sonicaps give you a great sound for the cost, Solen inductors are also great for the price and Mills resistors are very good. If you want to build the best Duelund components are the way to go; their resistors are the best bang for the buck that I have found for resistors in the signal path.
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