DEFINITELY heed James' recommendation, even if you believe your speakers are a simple load. Not knowing with 100% certainty what your speakers' impedance characteristics are, you probably shouldn't opt to halve your current. Look at it this way : If you buy another 3B and run the pair of them mono, you'll have no more current on tap than a single 3B. The majority of speakers on earth like current. Current to speakers is somewhat like torque to axels. We like to see that high horsepower (wattage) number on paper and brag to our friends about it, but it is nearly meaningless without torque (current).