What would be a good Replacement speaker for this RB-120BT 120W 1x15 Bass Combo 120W of power to drive a 15" speaker. 4-band EQ section (low, low-mid, high-mid, and high) plus contour knobs (low pass/high pass) make tone tweaking a breeze. EQs are ±15dB with zero at center. Also features a line out, CD/Tape in for practice, headphone out, and an XLR direct out (pre EQ) with ground lift. ***NOTE*** I dont feel THAT strongly about this amp, its the sales pitch from Musicians Friend.