It takes more than a Fluke meter and a load resistor to properly measure the power of the iAmp800. The technique that was tried works OK for the most basic measurements; however, the 800 is a little more sophisticated. I can't blame anyone for trying as this is how people learn, and I'm the last one to discourage learning. Everyone at EA encourages all players to learn as much as possible about the equipment they own or intend to own. The 800 will deliver 1000 watts RMS into a 2 ohm load, and 800 watts into a 4 ohm load. What complicates matters is that the internal limiter engages once the amp goes into clipping. Once the limiter engages, the power is scaled back. The time constant of the limiter is a few hundred milliseconds and is something you can't see with a digital meter. To look at what is actually going on, you need a storage oscilloscope that is connected differentially to the load resistor and is set to trigger at the point just before the limiter engages. Getting this set up correctly is tricky as the limiter is somewhat frequency dependant (for that matter, any power measurement made without visual examination of the output waveform is marginal at best). And, signals from bass guitars are usually not symmetrical and have huge peaks, and this lack of symmetry also interacts with the limiter circuitry. Also, the original power measurements were made with the limiter out of the circuit, something the end user cannot duplicate. One other variable that is usually overlooked is that as you crank up the power (from any amplifier) using a sine wave input signal, the AC line voltage will sag. The 800 will draw 10 amps at full power from the AC line, and it is not uncommon for the line voltage to sag 5-10% under these circumstances. The lower line voltage means lower output power. When a sring instrument (excluding keyboards and such) is played through an amplifier, the AC line current is extracted in pulses, and the current available to the power amp stage is averaged out due to the storage capacitors in the power supply. We pick the capacitor values to help compensate for the sag in the line voltage. Everyone at EA is available for technical discussion on any of our products. Mike Dimin is also a good resource. So is Dave Freeman at Club Bass. Gary Gibilisco, Euphonic Audio, Inc.