Best amp for $550 to mate with the following...

Go to Class D Audio's website. You can buy a complete amp, a complete kit, or amp modules/power supplies. In any case, they are an indredible bargain, beautifully made, with high quality parts (in the USA), and are one of the best sounding amps I've ever had, after 40+ years at this.

Better than VAC, Plinius, Aragon, Parasound, etc.

Dan

add $1...200 and you'll get Bel Canto S300 little amp. this one indeed plays music!

If it is possible save up and hold off and get a new Odyssey Audio Khartago for $995.00. Factory direct ,30 day return, 20 year warranty, made in USA. You would be better off in the long run than buying some older amp that might end up giving you a headache down the road. Check out their site!

An Emotiva amp would be a good, solid choice. The XPA-200 would work quite well for $499. Plenty of power and a great warranty.

https://emotiva.com/products/amplifiers/xpa-200

Odyssey Khartago Plus usually go for around $600. Mine was outstanding