[Arny Krueger]

"Bill" wrote in message
. ..
Plays Real Basses wrote:
Scott Dorsey wrote:
anahata wrote:
I take your point, but I'm suggesting or assuming that an amplifier
rated at 500W into 2 ohms will have lower output device resistances
than a different amplifier rated at 500 W into 8 ohms.

This isn't a good assumption to make. In fact, the two could even be
the same amplifier!

A typical amplifier rated at 500W into 8 ohms should also be rated 2000W
into 2 ohms, and therefore ought to have _lower_ device resistance than
an amplifier rated at 500W into 2 ohms.

Unfortunately many don't. Which is why a lot of amplifiers rated 500W
into 8 ohms are only rated 1500W into 2 ohms... where is that other 500W
going? --scott


HEAT...

For raw power, one of the new things coming out of the chip manufacturers
labs is PWM, or Pulse Width Modulation so that the output transistors are
either fully on or fully off.

The other approach is called Class G, where the power supply voltage is
modulated to meet the current needs.

As others have noted, both Class G and PWM technologies go back at least 20
years and have very mature examples on the market right now, with
more-or-less competitive performance and reliability, selling for
competitive prices.