I have a Roland CB-100 (Cube 100 Bass) 1x12 combo amp, and would like to get more volume. I tried running two combos, but kept getting a white noise in the second amp. That was with either amp first, and trying both the Line Out and the Tuner Out jacks. It seemed like a good idea, but didn't work. Then I tried an 8 Ohm 1x10 ext cab, and it was quieter than the combo by itself. Specs say 8 Ohm MAX for ext cab. Searching shows people get better results with a 4 Ohm ext cab with that amp because the ext cab jack is in series. I thinking about getting another 8 Ohm 10" speaker and making a 4 Ohm 2x10 ext cab, but am wondering if it would be a waste of time and money to do so. Do you think the 2x10 ext cab would be worth the trouble, or should I just accept the amp as a 1x12 combo?