Is the bass adequate when using a digital source?
The reason I ask is that I had the opportunity to audition a couple of power amps in my main system. One was an older Lexicon, another was a fairly expensive Chord, and I threw in an older Jeff Rowland I use for video.
Result? None had the bass richness of my usual power amp, a Conrad Johnson Premier 11a from the 1990s.
Phono cartridges will also offer a range of bass reproduction but I'd suggest that before looking there, you first confirm whether any bass shortcomings might not be due to the amplification train.