Originally Posted by CharlyD
The interaction between an amplifier and a speaker can be quite complex. While speaker sensitivity is the most critical factor, parameters such as speaker impedance and phase can also be critical. The JBL's you're considering, however, have very well-behaved impedance and are easy to drive. If the speaker sensitivity is rated at 90dB/1W/1m, and you'd like to achieve a volume level of 110dB (quite loud) you'll need at least 100WPC. The easy calculation is:
Pout = 10 ^ ((dBmax - dBsens) / 10)
If dBsens (dB out at 1W) = 90dB and dBmax (SPL goal) = 110dB
Pout = 10 ^ ((110 - 90) / 10) = 100Watts
Wow! That's a great response! Thanks! Now I can do a maths while looking at various amp/ receivers.
Question - if I buy an AVR with 40WPC for now, could my speakers fry the AVR? Or vice versa?
Can someone also advice me on how to reuse an old AVR when upgrading with a new one? Here is the post - http://www.avrevforum.com/showthread.php?t=1921
thanks and regards