Pioneer CS 99 Test-Refurbish?

[Myvinyl333]

My CS99's seem to be having issues. The right speaker seems to lack the high end. I had a mid range refoamed but that did not help. What can I do to refurbish them?

 

[Myvinyl333]

I will do a more in depth search as to how to check the performance and refurbishing CS99 speakers. No reply's = I need to look harder before asking

 

[larryderouin]

If the only thing you did was to refoam the mids, you've still got a little road ahead. 13 hours overnight doesn't give the guys who might have 99's a chance to think over their answers (if they do choose to answer).

Loss of High's suspect the tweeter or it's associated x-over network. Meter the tweeter with the leads disconnected and check against what's written in oHms on the magnet structure. 8ohm speakers will very from 6.5 to 9.5-10oHms. If the speaker checks out, then replace all the capacitors inside regardless. Yes they do go bad and will shut off power to speakers or will change the frequency response of the speaker.

Also DeOxit any and ALL mechanical potentiometers, switches, and physical connections.

Put it all back together. Enjoy.

 

[Myvinyl333]

No Tech skills

If the only thing you did was to refoam the mids, you've still got a little road ahead. 13 hours overnight doesn't give the guys who might have 99's a chance to think over their answers (if they do choose to answer).

Loss of High's suspect the tweeter or it's associated x-over network. Meter the tweeter with the leads disconnected and check against what's written in oHms on the magnet structure. 8ohm speakers will very from 6.5 to 9.5-10oHms. If the speaker checks out, then replace all the capacitors inside regardless. Yes they do go bad and will shut off power to speakers or will change the frequency response of the speaker.

Also DeOxit any and ALL mechanical potentiometers, switches, and physical connections.

Put it all back together. Enjoy.

I am not tech savvy nor do I have a way to meter the tweeters... Is there anything a novice can do to help determine if what you say is happening?

 

[Wigwam Jones]

I am not tech savvy nor do I have a way to meter the tweeters... Is there anything a novice can do to help determine if what you say is happening?

First, swap the cables to the speakers, left for right. This will test to see if the missing high-end in one speaker travels with it or stays on that side. If it travels, the problem is in the speaker. If it remains in the same channel, but now the problem is with the other speaker, then the problem is your source.

Assuming the problem is in the speaker, remove it and the tweeter from the 'good' unit and swap them. If the 'dead' speaker wakes up, you may have a dead tweeter. If the dead speaker is still dead on the high-end, then possibly you have a problem with your crossover network.

At this point, you most likely have some idea where to look. It is not uncommon for tweeters to die, and it's not uncommon for capacitors in crossovers to die, so you'll need to do some detective work to figure out what the problem is.

 

[Myvinyl333]

Thanks

First, swap the cables to the speakers, left for right. This will test to see if the missing high-end in one speaker travels with it or stays on that side. If it travels, the problem is in the speaker. If it remains in the same channel, but now the problem is with the other speaker, then the problem is your source.

Assuming the problem is in the speaker, remove it and the tweeter from the 'good' unit and swap them. If the 'dead' speaker wakes up, you may have a dead tweeter. If the dead speaker is still dead on the high-end, then possibly you have a problem with your crossover network.

At this point, you most likely have some idea where to look. It is not uncommon for tweeters to die, and it's not uncommon for capacitors in crossovers to die, so you'll need to do some detective work to figure out what the problem is.

Thank you for the step by step procedure. I can try this tomorrow and report back. :thmbsp:

 

[Jedi]

You may also want to fiddle with the mid/tweeter level knobs on the back . With music playing reach back there and turn the knobs a few times . You may hear some crackling and the tweeter come on . If so then you'll need to spray them with Deox .
Rudy .