A bassist I tech for hasn't been too happy with his tone and feels it lacks punch. Right now he runs two Ampeg B5r's going to an 18 and a 4x12 guitar cab with with lows boosted to the 18 and highs boosted to the 4x12. For gigs he sets one on either side of the stage and mics both. He also uses heavy distortion quite a bit of the time. I've been suggesting for awhile that he try a ported 4x10 in place of the 4x12 and stack it on the 18 with and/or trade his Ampeg heads for GK heads and turn up the bridge pick up on his P/J bass to give him more punch. He just called me with a concept he wants to try running two 18s and nixing the 4x12. With the amount of tapping and walk ups he does I don't believe this is the answer. He also suggested that if we do add 10s to his rig he would want to do two 2x10s and two 18s on either side of the stage. In case you couldn't tell he was a sound guy before he was a bassist. He essentially wants a PA instead of a bass rig. http://youtu.be/6IOHQ301JPY Here is a live video of him, at the 2:00 mark the guitars drop out and you can sort of hear him, but its just not as present as it could be. What do you think would give more punch and cut through the live mix better?