Am I totally nuts or just a bit off?

Truth be told I don't even know what a um is,all I ever studied was history.

:-)

"um" = "micro-meter" aka "micron" = 1 millionth of a meter = 1 millionth of about 39.37 inches.

"mil" = thousandth of an inch.

15 um = 0.00059 inches = about 0.0006 inches = 0.6 mils, as Viridian indicated.

Regards,
-- Al

Viridian- I played 3 records that have been in heavy rotation(oh, that Dakota Satanton)the sound is much fuller and with more detail, must be getting all of that groove!
I did't notice any damage, just less surface noise.

That whole 91ED family must be the greatest buy of all-time in audio.First real table I ever bought was an AR XA that came with one. 45 TT's and twice as many carts later I should have just stopped there, have just as good sound and I'd be 30K richer .

Al, thanks for the class, even at age 78 I got a lot to learn LOL.

Imagine: If the internet had been around in the late 50s everyone would have been discussing how stereo and Solid State was ruining HiFi and young people- a conspiracy by music shops to make us buy two of everything.
I had an Uncle that was into HiFi. That must be how I was influenced during my formative years... He had a stereo console in the 60s and moved up to a Pioneer Quadraphonic receiver in the 70s with a Dual tt. So extrapolating speaker count from a single in the 50s to two speakers in the 60s and 4 speakers in the 70s, we should be up to 64 speaker systems today. Let's see, if my uncle were still alive today, I could show him my 7.1HT system that is mostly for the kids. Hey, that HT system has 20 drivers when I add them all up. I guess the speaker marketing guru's have been pretty successful after all over the decades.

Yrs ago I was at a flea market on the Ohio/PA border. I bought a stereo copy of Ellington's 'Indigos' from one dealer and a mono copy from another (SCORE!;)! I always preferred the mono version. Later on I read that they're actually 2 different recordings as Duke decided to re-record it in stereo. Hmmm, haven't played them back-to-back since I got them, and always leaned towards the mono, think it's time to re-visit!;)

Tonywinsc, by your own calculation, you're 44 drivers behind schedule! ;-)

I was once ahead of it. Back in 1973 I had 18 drivers in my 2-ch setup... a pair of Bose 901s. In those days, Bose was pushing 901 owners to add a second pair, facing outward toward the side walls. They were advocating a surround field (from just two channels) decades before multi-channel became popular.

Of course the phase confusion from even two 901s was pretty awful. They were pleasant, midrangy speakers with a huge sound field, but very muddy. I can just imagine how murky four of them would have sounded. I'm now down to 10 drivers for 2 channel, and they're all facing the right direction!

For a mono source, Jeff Catalano's single channel amplification and speaker must sound sublime. Wish I'd heard that.