El Meda wrote:

The amplifier will try to keep a constant output voltage, so, if you
use 4 ohm speakers instead on 2 ohm speakers, you will have half the
current across each one of them, or 1/4 the Watts i.e. 10
Watts/channel.

Sorry! it's 1/2 the Watts (20 Watts/channel), not 1/4.
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Ing. Remberto Gomez-Meda
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.