Which Threshold s are best?

mrchips i own a threshold sa/3.9e amp. Can you tell me how this amp fits into the threshold family. The rest of my gear fet/10, dac1/e. I'm looking now at upgrading my speakers. Polk SL70 is what i have now.

Also if i was looking to purchase the sa/1's what would be a fair market price. Thanks for sharing your knowledge on threshold.
Tmoon

I believe everyone on this thread would be in total agreement that Mr. Nelson Pass has to be one of the greatest designers in the history of modern high end audio.

I now power my bi-amped system with a pair of Pass Labs XA-100 monoblocks and a pair of Threshold SA-1 monoblocks. I do believe that both pairs of amps are the best sounding designs in either the history of Threshold or Pass Labs. I used to have a pair of Pass Labs Aleph 1's, which are a classic design also, but believe the new XA amps have surpassed the sonic performance of the Aleph and SA series amps.

Unlike Lawyerman, I find the XA-100's to be a better sounding amp then my SA-1's in my system, however they are both great and its amazing that the SA-1's are still almost as good as any SS amps on todays market considering that that they are twenty years old!

Can someone tell me how much of an upgrade a SA/4e would be from an 6.9e? I know there would be some power difference but how much difference in sound if any?

Sorry guys, that'a Threshold 3.9e not a 6.9.

a threshold s300 recently came into my possesion and i was wondering what thresholds are for. i am a bassist and was going to try to hook it up to amp a home-made cab (using 2 JBL 12's) i have never heard dof threshold before now and im sure u guys could tell me a little more about it