I agree with you the Spark does have a bit of warmth to it so might seem to bring out the bass a bit more maybe not for sure. I have a couple of other amps comparable in power and price ( JDS Labs Atom and Schiit Magni 3 ) and while I think they both sound pretty similar the Spark definitely sounds warmer. I’ve always liked the Spark as I was on the pre sale list for the original which was to be a portable amp .