Used M.Logans-What to look for?

If you are buying SL3 or reQuest make sure you check the binding posts. They have a tendency to get lose inside. It may not be a big deal if you know how to open up the back cover and tighten them.

Be aware that these are 4 ohm speakers that dip below 2 ohms at 20k. You need a good amp that's power is rated at nearly double the 4 ohm load as it is for 8 ohms.

The younger the panels, the better.

Dust, smoke, humidity and pollen are a factor. I failed to maintain my Aerius I's last spring and the output from the panels was reduced to virtually nil. I vacuumed them with a household vacuum cleaner and output improved a bit. Lived with that for a week and then pulled out the 4.5hp shop vac and they came back to life. This is recommended in the manual and by Jim Powers at M/L via email. "vacuum them. The stronger the better." They are extremely durable.

I love mine but be prepared to spend alot of time getting them positioned properly.

I had Sequel II's several years ago and while the panel sound was to die for the sluggish bass (in comparison) drove me nuts...so I sold them. Therefore, I'm told, get only the full range ML's like the CLS IIz...which are really the idea of stats in the first place. Better tuneful bass than out of whack 'bass'. OR, buy Quads!

I have several options through private owners near where I
live with the SL-3; the Ascent and an Aeon used and I just din't know what to look for to be sure that they are not
damaged in any way since I have no clue in these so called
"electrostatic" speakers. How do you tell the condition of
the diaphragms or the panels? By the way your inputs so far
have been very interesting and helpful and I thank you.

You don't need to "look" for anything. Nor can you tell about the condition of drivers of any speaker by looking. Trust your ears/take them home to listen with YOUR electronics (very important) and you'll know if you're a stat guy or not. I obviously am a stat guy because my humble Aerius i's (powered by Anthem MCA5 in a bad room) sounds great.

A good sub will eliminate the probs that were mentioned above. Good luck