Hello! As you can see I build basses and guitars. I already have a "test rig" with an Art preamp and a PA amp/cab. It's pretty transparent and really brings out the real sound of an instrument. But I'm a bass player and the lack of "boomy" bottom end is killing me! I was considering to get a standalone cab for my rehearsals. I mainly play fretless 4 strings, my main influences are Mick Karn and Percy Jones. I can probably live without a tweeter. Have 800w at 4Ohm and 500 at 8. I was considering an Hartke XL115 but I've never tried it myself, only used the TP series with 10"s. Anyone here uses a 15" or 18" as a standalone? An SWR 18" would probably cure my desire for "boom" but how would it work without a 2x10"? TIA.