SP-70 Dead Tweeters

[Trw]

@Trw, posted upthread was a picture of one disassembled, clearly had a break in the coil wire coming off the former. Suspect condition of the other one is much the same as they both measured open.

I knew one was,i was unsure about the other.
I still find it difficult to comprehend
In 35yrs of messing about with hifi i'm yet to blow any driver/tweeter,i've had plenty come to me with issues all easily resolved.
Likewise with amps/receivers it's usually an easy fix.

I guess i'm just lucky

 

[Sansuiman]

I think given the age of these drivers, and the likelihood of abuse at some point in their existence (unless one is the original owner and can vouch for it's care from the beginning) there are quite a few around that were driven hard and damaged. These are fairly low power speakers after all. I can't discount the possibility either that it was just mechanical weakness in the coil wire that occurred over time, even without being overdriven.

When you consider the job the voice coil is doing, vibrating that diaphragm tens of thousands of times per second over many years of use, that something will eventually wear out is not surprising. Considering the SP-300 horn mids and tweeters, just for example, are notorious for a high failure rate based upon past posts in this forum , this doesn't seem to unlikely. Some of these just don't stand the test of time. The coil wire is the weakest part of the design in a driver, and therefore the most likely to be damaged by other than even outright abuse.

 

[Mr_Mustrd]

Good Morning!

Gave the speakers a good listen over the weekend ranging from hip hop, blues, and rock. At first I could have sworn there was this background buzz no matter what I played, it was especially bad on bass heavy songs, but I let them play all day Sunday while I was working around the house and by the end of the day I feel they really opened up and the buzz has disappeared, I’m not sure if the caps were burning in, which I’ve read that is a myth and more of your ears getting used to it, or if the surrounds are loosening? There is more warmth in the bass and like @Trw said the bass was surprising on the 2000x! While the new tweeters do sound good, at times I feel the treble can be a little harsh though, as in the S's or more tiss than they need to be and it sticks out and doesn’t blend well with the rest of the song, and the switch has been set to clear, but I’ve tried all three and like clear the best, but will experiment with the other positions some more so my opinion could change.

Overall I am pleased with the results, but I can't lie it does make me crave to hear what they really sound like with oem tweeters so i'll be keeping an eye out for a solution to that, but in the meantime, to just get the speakers working without modifying it a ton so that it's not reversable and that doesn't cost more than what I paid for the speakers to begin with, this was a great call. Thank you everyone who responded and helped out!