I'm sure this question has been beat to death, and I apologize upfront for the redundancy. I'm not sure how to search through old posts, and I have an old man's aversion to learning how. I was hoping someone could recommend an amp that is light (sub 50lbs) but is articulate and capable of handling a low B. Loudness/volume is not a priority; quality of sound, reliability and portability is. Is there an amp that would fit this bill for around $500? Thanks for your input.