Great to see this thread on Synergistic speakers. I have been looking for one for years but with no luck. I bought a pair of s-62s new in the late 70's after auditioning dozens of mid to high end speakers. To my ear (at that time), these speakers were by far the best sounding. Open, clear mids and high frequencies with a solid base that rumbled the floor. I spent a lot of time at Hi-Fi shows in Philly and New York but never heard a sound like these from speakers three times the cost.
Granted speakers have personalities and the Synergistics matched mine to a tee. Kinda like a wife.....they all sound a little different and you should have the one you want to LISTEN TO for the rest of your life. For me the S-62 was a marriage made in heaven.
Unfortunately. right after I bought my pair )which had one 12 inch base), Synergistic improved the system. They changed the S-62 configuration and added a 12 inch passive radiator. To my ears, they destroyed the speakers. The base was muddy and lost its trememdous depth. Soon after they went out of business.
My S-62s are now 30 + years old and going strong. In fact might even sound better. No repairs or changes in all that time. If I could find another pair, I would buy them in a heart beat.
The Synergistic S-62 was a modest priced ($400.00 per speaker), some what ugly, boxy speaker that sings like an Angel.