Vintage KEF vs new Salk

Marc,
I am not sure what is making the fuzzy sound in your left speaker. It could be the tweeter or something else. 

The bottom front driver is the lower midrange driver and the upper front driver is the upper midrange driver which is the Uni-Q driver housing the tweeter. On the Uni-Q driver it would be hard to tell if the fuzzy sound originates from the tweeter or woofer. The NT25 tweeter is a tight fit in the center of the midrange driver and maybe something is misaligned.  

If you look in the front port with a flashlight I think you can see one of the woofers and check if the foam donut that goes around the coupling rod is degraded.

The four-way crossover is assembled on a large printed circuit board which is mounted on the reverse of the plastic rear terminal housing.

Regarding taking them apart, I believe there are some examples from people who have done it on Audiokarma.

Regarding the Salks, I would not rule them out. They are fine speakers. The best way to make a decision is to hear them for yourself. Any move you make will be in uncharted sound unless you can audition them.

Marc,
I forgot to mention that the front polymer baffle housing the two midrange drivers is removable. There are 6 screws attaching it to the cabinet. I think they are hex head screws but might be torx.

Thanks once more.
 I take it you're not familiar with the ATC SCM 40 v2?
The seller just came down $500 this morning - an interesting coincidence. I'm leaning toward these right now. I just started a thread to compare them with Song3 Encores. Any thoughts?

m669326,
Those ATC's are very fine speakers with a great midrange (and everything else). I think they would be hard to beat, and they are made by a company who really knows what they're doing, and are very grounded in solid science and engineering. 

OP, I don't know the Kefs but I just got some Salk SS 6M's. Happy to let you know about them Feel free to message me.