hello all,im new here and was wondering what i should do. i recently got a threshold s 500 its the silver 1. i dont know if its series 2 or not.i read on an avs forum that said it could be modified to pure class a @160 watts??? wonder if thats true, im going to try to make this my last amp purchase,does anyone now the best way to make this amp sound its absolute best as far as mods/upgrades. thanx ...janx
So, if you search on SA/1 new front end you will find a whole thread on upgrading the big Thresholds. Nelson Pass, the man himself 
designed a new front end board for the Amps that you could wiring in and up the bias to run class A. My personal amps are a modified SA/1, mainly in the power supply. The old Threshold Amps are definitely worth working with.
designed a new front end board for the Amps that you could wiring in and up the bias to run class A. My personal amps are a modified SA/1, mainly in the power supply. The old Threshold Amps are definitely worth working with.