Should I buy used Thiel CS5

I must also consider the first order crossover and the extra work that it places on drive units. No doubt there has to be some voice coils in those drivers that are near burnt after 30 years of use. I will have to call cohert source service to see if they have replacement drivers for the CS5. 

@jeffvegas, when making that call, you might want to inquire about availability and costs for upgrading to CS5i status, as well as about possible future upgrade possibilities. 

jeffvegas,

For a price point, I have a pair of CS5's that I bought for $2600 including delivery about two/three years ago.They are oak with the cream colored grills.

I had to replace one of the yellow speakers (largest of the three small ones) about  a year ago. Otherwise no problem except finding a good DAC to tame the tweeters which can sound sharp.

Thanks for listening,

Dsper

Other way around to me, the tweeter doesn’t need taming, it’s oil can resonance is well above 25khz and low in amplitude
The dac/pre/amp has to be good, so the tweeter doesn’t show up their HF deficiencies.

There is the possibility though that the tweeter if "ferro-fluid" cooled, this will go hard with age and cause non linear sound distortion issues.
B&W need their ferro-fluid replaced around this same age https://www.speakerrepairshop.nl/en/instructions/replace-ferrofluid-in-tweeter/c-36

Cheers George

@georgehifi

Hi I just bought a new (Manufactured 2019) pair of speakers that uses Ferrofluid in the tweeter. How long does it usually take for the tweeter to go bad? Any factors that can make the tweeter go bad prematurely, likely hitting it with abusive loud volumes? I usually play low-med volume...just sayin Thanks in advance.