As Neil Young said in the song Powderfinger..."red means run son, numbers add up to nothin"
Same thing for power amps and rated power output. It all comes down to if you can get the little lights blinking ...or not. I used to have a couple of 4B's running as mono blocks in my family room. I was using PSB's Stratus Goldi's speakers, which I believe had a 4-5 ohm impedance . Every time I played the Eagles movie "Hell Freeze's Over" the opening drum tracks of Hotel California would clip the amps......i swear it wasn't that loud ; )
Yes James I know, a 4B in mono with a 4 ohm load is not a recommended configuration : P Sounded pretty good though!