Here how I got a great bass from mediocre Triangle Signatures.
1. Buy Luxman 120A vintage amp and connect it to the bass speaker posts
2. Connect Maven receiver to the mid-hi speaker posts
3. Use receiver Pre out to connect to Luxman.
Drive speakers with both amplifiers and use volume on Luxman as tone control for bass. Triangles came alive as if by magic. They really start to rock and jazz never sounded so good. At some passages they bass was reverberating in my sofa floor and you can feel it with your 80% liquid body.
I highly recommend it.