[sdiy] Re: crystal clear

[Don Tillman]

   > Date: Thu, 08 May 2003 15:12:18 +0200 (CEST) From: Magnus
   > Danielson <cfmd at swipnet.se>
   > 
   > Pbigamp = Ptotal = Ptop + Pmid + Pbas + Pcrossover

Sorry, I assumed you were referring to something else...

Imagine a simple biamping system:
  Low amp: 100 watts
  High amp: 50 watts

The obvious single amp version of this would suggest that a full range
amp equivalent would be 150 Watts.

But because the maximum amplifier voltage is proportional to the
square root of the maximum amplifier power, the full range amp's power
rating will need to be able to handle the sum of those voltages:

  Full range amp: (sqrt(100)) + sqrt(50))^2 => 291 watts

This is somewhat bogus reasoning because you will only use those 
291 watts during occasional peaks.  But it does mean that biamping
allows you to handle more peak power than you'd expect.

(And if something goes wrong, it keeps the 150 (or 291) watts out of
the tweeter.)

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com