Dried out ferrofluid ?

Saw a post over on Audiogon for rebuilding tweeters with dried-out ferrofluid and was wondering if any of the AR series is having this problem like the AR-11, etc? Roger

By owlsplace, September 26, 2014
17 replies

Thanks! If I understood this correctly, output from UMR drivers and tweeters can (only?) be reduced if the ferro fluid is dried out? This is certainly not the case with my AR90s. After recapping with modern poly caps, I had to permanently reduce the UMR drivers output by 3dB ...and they still can sound unpleasant and shrill on poorly produced recordings.