I have a Markbass Mini CMD 121P 1x12 Combo Amp which I really like... well maybe not the tweeter.. but it's loud, easy to carry and sounds really great with my Ibanez SoundGear 5 string... I'm considering adding a cabinet and wondered what would be best for my low B. I feel the highs come through fine with the 12" and the house PA.. but I need more punch on the low low end - so... A 15? 2 or 4x10? More 12s? This is my first bass amp with a 12" speaker and I'm rather impressed with it.. back in the early 90s I was using a Peavey 1x15.... and then more recently a GK head with a Behringer 2x10 cab (that combination SUCKED)... Thanks! Pete MostlyBass.com | …for educators, bassists, enthusiasts, & parents – information on teaching, playing, learning, maintenance, technique, construction, and more.