I have had a lot of mid priced bass amps over the last few years. Lately, I have been using an ART Tube EQ coupled with an ART TubePac into a Tapco J-800 power amp. This setup isn't very practical, the ART components aren't rackmounted (I have to carry them in a laptop bag.) I tried this kooky rig against an SWR SM-400, Hartke 3500, and a GK 400RB. With all things as equal as possible (EQ flat, similar volume, etc.) the ART rig sounds much warmer and thicker than the others.