⭕ Here is a rare opportunity to own a pair (2) Threshold Model SA/1 pure class A stasis monoblock power amplifiers in near mint condition . Theyre in excellent working condition. I have used and tested the amps, it all works lights and meters, oh yes just look at the beautiful large analog meters. The unbelievable bass and clear sound, you can hear the artist take a breath of air so clearly. They will make ordinary speakers sound like you would not believe and make high-end speakers sound like they should.