There are many useful, highly informative threads in these forums about equipment and sound. But...in the midst of these discussions, I often see assumptions about power ratings that are not factual. It's understandable, as marketers use specs to sell products without explaining them making it very easy for us to latch on to incorrect concepts. So here are a few points to consider before upgrading to a more 'powerful' rig. 1. If you have a 100 watt amplifier and you wish to double your volume, what wattage rating should you be seeking? 200 watts? 300 watts? 500 watts? No. 1000 watts! It takes 10 times the rated wattage to achieve a doubling of volume (all things being equal, and they never are.) 2. Then why do amp companies make a 200 watt amp, a 350 watt amp, a 500 watt amp...when the difference in volume would be difficult if not nearly impossible to hear? Well, IMHO it depends on the company. Some are just playing the numbers and getting you to buy into a more expensive amp. Others may give you this tiny bit of extra power and throw in features to get you to jump. 3. In my experience, more respectable manufacturers actually give you more 'current' or 'headroom' hidden in with their higher wattage rated amplifiers. This enables the amp to respond to the huge instantaneous power requirements of a low bass note or a slap tone. Your overall volume may have not changed too much, but the feeling of having power when you need it did. It's actually very difficult and costly to make an amp deliver these instantaneous low frequency sounds cleanly. However, the wattage rating will not tell you if an amp has this increased ability nor will it tell you if an amp SOUNDS BETTER. It's a measurement of power and if it's the only number you have for comparison, you don't know very much. Current and headroom use different measurments and are almost never quoted. 4. Wattage ratings are very deceptive. You can manipulate the rating by changing the 'load' the amp drives during measuring, the time it drives it, and the input frequency. Even a slight variation in these parameters makes a huge difference in the measured rating. All of the parameters affect each other and the rating. You need to know and control the exact measuring conditions or the ratings are worthless. And you guessed it, these parameters are either not quoted or are not the same in comparing two amps from different companies. (I'm not even talking about how the three most common types of distortion play into this.) 5. I use this analogy - if challanged to run a 1/4 mile drag race, which vehicle would you take - a 300hp Corvette or a 300hp 18 wheel tracktor/trailer. No brainer right? But if you go by the single horsepower spec, they should end in a tie. That's a way to understand how useful the wattage rating is for telling you what volume you'll get in the real world...in other words, not much. (If you think that the wattage rating of an amp is suspect, rating a speaker cabinet's handling power in wattage is a whole other can of worms.) 6. Speaking of speakers, it's usually much less expensive to get a more efficient speaker setup to increase your volume, than to get a more powerful amplifier. Bottom line - you'll only know what an amp can do for you by trying it in your specific situation. Any specification, by itself, will tell you nothing about sound quality, and very little about sound quantity.