In mid March I purchased the TS A20 amplifier. I had it briefly and what I heard compared to the TS A75 I was more than pleased to have made the purchase. I am upgrading my speakers this summer and had in mind to make this purchase when I got the speakers in place. Serveral factors sped up my time table (tariffs & the fact it might sell out). Unfortunately the amp has been with a friend as we had three weeks of being away from the house. Before my friend took it, I noticed that at lower volumes it played with more detail than the A75, and that its overall sound quality was very pleasing and musical. My friend told me it is a very good amp. Once I get it back in my system, I will have a chance to provide more feedback.