Speaker and amplifier power handling

I've recently bought a musical fidelity a3 integrated amp rated at 85wpc which I am connecting to a pair of b&w dm 601 bookshelf speakers that are rated at 25W - 100W. The amplifier's manual recommends a power handling of at least 150W. Is the amp actually overpowering my speakers,If so can I damage my speakers in any way? Would a lower power handling (below 150w) actually affect the sound quality?