I guess that rule of thumb is applicable to a lot of things: my motorcycle is a lot happier running near the upper 15% of the speedometer's range

That's one reason I wouldn't consider using anything more than my 5 watt amp for the HF horns. I'm actually considering trying an alternate tube in the output (2A3 vs 300B) which will lower the power to about 2.5 watts, but will put the amp even more into the meat of it's range at normal to loud listening levels.

[This message has been edited by soundhound (edited January 22, 2003).]