Which Threshold s are best?

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

I have a Jon Soderberg upgraded S/150 sereis II. It is the lower powered one of the S sereis, but many thought it to be very Musical. It was rated at 90 watts but performs like much more.

Here is the proper website for Jon Soderberg.

http://www.vintageamprepair.net/