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Help with Sonus Faber Extrema issue

I have a pair of Sonus Faber Extremas hooked up to a pair of Parasound JC1 monoblocks.  One of the speakers periodically will exhibit signicantly lower volume (down to almost no volume) in the middle of a listening session.  It seems to occur when during more dynamic passages and also when the amps have been on for a while.  If I turn everything off for a few minutes, the problem usually goes away.  I reversed the speaker cables at the speakers and the same speaker still exhibited the issue, so the issue is with the speaker.  What could cause this problem?  Could it be a bad connection somewhere in the speaker?  Could it be that crossover parts need to be changed due to age?
wcheng2
georgehifi's avatar
georgehifi
10,312 posts
 
Yes you got two sets, one for the bass and one for the tweeter.
The tweeter pair should measure open circuit because of the cap in series .
The bass will measure what ever the resistor is in series, (does anyone know what that is?) . https://ibb.co/BNtQdtJ



One of the speakers periodically will exhibit significantly lower volume (down to almost no volume) in the middle of a listening session.
BTW: you haven’t said what’s actually happening, is there nothing from the tweeter or nothing from the mid-bass or very little from the tweeter or very little from the mid-bass
Cheers George
mijostyn's avatar
mijostyn
8,570 posts
 
wcheng2, You need a volt /ohm meter. You can get one cheap.
  https://www.amazon.com/AstroAI-Digital-Multimeter-Voltage-Tester/dp/B01ISAMUA6/ref=sr_1_4?crid=25A5L2Z8KUDEW&keywords=volt+ohm+meter&qid=1571097024&sprefix=volt+o%2Caps%2C160&sr=8-4
There is a short in that speaker. Again, if they are still under warranty let the dealer deal with it. If not you are on your own. You have the good speaker for comparison. Good luck,

Mike
daveyf's avatar
daveyf
2,877 posts
 
Winston, I am almost 100% sure your problem lies with the x-over. The Extrema's need a lot of power...but can, like any speaker, be over driven. That and the age, means a trip to to the tech. 

@mijostyn, the Extrema's haven't been made for decades...warranty service isn't in the cards, LOL.
imhififan's avatar
imhififan
2,205 posts
 
The tweeter pair should measure open circuit because of the cap in series .
The bass will measure what ever the resistor is in series, (does anyone know what that is?) . https://ibb.co/BNtQdtJ
George,

Extrema treble section has no series capacitor but a inductor connected in parallel with the tweeter and a resistor in series to match the output of the woofer.

https://www.hifisentralen.no/forumet/attachments/diy-og-utvikling-ha-yttalere-forsterkere-etc/228418...

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