Look into the Digital Amplifier Company's (DAC) amp selection. I have had many different class A (Pass, ATC), A/B(too many to mention), and class D amps over the years. DAC's amps have a grain-less sweet clean tone, perfect bass reproduction, and all the power you will need! Plus you get 30 days to try them with a no hassle return policy!
https://www.cherryamp.com/
https://www.cherryamp.com/