In a message dated 4/25/2005 18:06:57 PM Pacific Daylight Time, rondec at easystreet.com writes: The difference between 100 watts and 800 watts is virtually identical to the difference between 15 watts and 100 watts. No quite, but almost. It's 9 dB. That would make the difference between 15 watts and 120 watts. Geoff, K6TFZ