I'd like some advice. I'm close to upgrading my receiver and am considering the Sony DB940 or trying to find a discontinued ES333. My question is, my current Polk speakers are rated to 100 watts the ES is a 110 watt receiver. My rule of thumb (to me and the kids)is keep the volume below half-way. Will I be risking damage to my speakers by going 10 watts over the rating? Is my half-way up rule valid?