That amp should work fine with two π loudspeakers. If it produces 10 watts with a 4Ω load, then the output voltage is about 6.3v. That would produce 5 watts in an 8Ω load.Lots of people run two π speakers using flea-power SET amps that only develop a couple watts. These are sensitive speakers with a benign impedance curve. Makes them an easy load to drive.