I want to purchase the musical fidelity a300 integrated amp. From what I understand the power watt ratings of the a300 is 150watts per channel. All the bookshelf speakers I am considering have a recommended ratting of 20watt - 120watts. Will I be able to use a floorstanding speaker like the monitor audio b4 or b6 which is rated at a power handling rms of 150watts or will I need a speaker ratted higher so I will not overdrive it??