This little easy to use Crown power required for speakers say at given 85db is plenty loud enough.
http://www.crownaudio.com/apps_htm/d...ct-pwr-req.htm
I use this handy online measurement calculator after measuring with tape measure
http://www.onlineconversion.com/length_common.htm
For the distance at 7 feet I need only 4 watts with plenty on tap for the LCR LF and HF.
Surrounds 3 watts
Sub I need very little according to it LOL 0 watts LOL that’s plenty of headroom!
