On Sun, 04 Jan 2004 21:56:33 GMT, "Form@C" wrote:

Point taken.
Right, the (transient!) SPL at the concert seat could hit around 190dB.

Nope, 105-110 dB absolute maximum.

Pick up a hand grenade, pull the pin, wait five seconds, and you'll
experience about 160dB - briefly.

Example: Kef Coda 70: 2.83v/1m 91dB, 8R, frequency not stated (efficient
for small boxes). So at, say, 4m away you get 79dB at your listening
position for 1W at the speakers (it appears to be 6dB each time the
distance is doubled).

Only in an anechoic chamber, and it's 3dB, not 6. In a big enough room
for a 4 metre listening distance, you'll probably get about 85-87dB/w,
depending on furnishings.

So, for our 190dB we need 2.5W at the speaker?

NO!!!!!!! Where the heck are you getting these numbers?

If you're getting 85 dB/w, then for 105 dB, you need 100 watts.

Ok,
not a lot of bass in that little box (-3dB at 45Hz), and they have a max
output of 109dB anyway, but you get the idea... 5W is still a lot.

No, it's pathetically inadequate.
--

Stewart Pinkerton | Music is Art - Audio is Engineering