Originally Posted by alan0354
Are you saying that speakers age? That they need routine maintenance like everything else? That even if one is careful, not over driving the speaker, it still need to change ferrofluid and maintain them?
If so, it's just as well I changed my mind of buying the Divas. I thought if they are good, they are trouble free forever.
It really depends on the design and the condition the speakers are exposed to.
Tweeter designs with ferrofluid need to be replaced or refilled because the fluid dries out. The highs will not sound as sweet even if they are barely used. I'd say 20 years and over is around when I would start to doubt their condition.
The KEFs I am rebuilding sounded perfectly fine. But the fluid was dried out. If I were to power them up and play them for a long time, there is a possibility they may burn out. The fluid allows heat to dissipate into the chassis, besides other benefits. Without the fluid, the voice coil has no contact to the rest of the tweeter.
For woofers, neoprene surrounds degrade rather fast. 5 years, sometimes even less. This almost doesnt happen for cloth surrounds. Butyl rubber surrounds are pretty hardy too.
As for cross overs, if the caps look good and are late 80's or later, I won't replace them unless I can hear something wrong. For 70's and earlier, all of them come off.
Some MDF cabinets also do not survive aging well. Ive seen MDF turn into crumbly crap.
When buying used speakers that are 20 years old and over, I look into serviceability and parts availability. If other people are rebuilding them, thats a good sign.