This is just for my curiosity, sort of, but does anyone have a formula for calculating the energy needed to produce sound at different frequencies, dB's being equal? I suspect low frequencies contain (relatively) enormous energy and need big watts to produce them, but I haven't found a formula to quantify the relationship yet.

I'm using a 300 watt amp for 290hz on down and six tube watts above, and it seems about right. I would like to see what mathematics has to say about it.

I am also curious about the whole HT sub thing. I want to see some science applied to the choice of amplification there.

Also, a somewhat related topic: when a master line level volume control is used, what is the best position for power amp volume? I use about eleven o'clock. This is all about headroom and tone, of course.

Clark in Peoria