I am going to buy an AES/Cary model ES1 300B amp for my L300 speaker. This amp only rated at 7 Watts per channel. Will this amp has enough power to drive the L300? I notice that the L300 is an efficency speaker but I don't know how much db? It is 93db or 96db? Where I can find the formula for loundness (ex. db, watt, etc)? Any input will be greatly appreciated.