Here goes Brad again - lack of deep knowledge and a fairly irrelevant question but I just need to know the answer and how its all worked out. M&K have said that my S-85's are slightly higher spec in THX levels. The speakers will produce 106-107db (at 2 meters) which requires a 125Watts into 8Ohm or 250W into 4 Ohms amplifier. I believe that my Arcam P-25 will deliver around 140W into 4 Ohms all three channels running. So, what's my question? If 250W will get me speakers to play at 106/107db at 2 meters, what will 140w deliver in db's? Even more confusing is that fact that these speakers operate at 6Ohms nominal between the range of 87 - 20,000! I just got to know how they work this stuff out. A worked example of this would be good. Somebody please explain!!!