I have read several reviews about the M80 and all of them are very positive. I'm planing to purachase the M80 but I have some concerns. I read reviews about the speakers from 'Sound Stage Magazine' and it was very positive except for that the placement of the speakers can be kind of tricky. Does the rear ports of the speaker make them dificult to place? If so what areyour best recomendations for placement for this speakers? The speakers have two ports in the back. Can you explaine what is the purpose of the two ports. I will apreciate any clarification. Thanks