My new home theater :)

[SlickSnake]

Originally posted by: YOyoYOhowsDAjello
What's a "20k bass sub woofer"?

Also it's very rare that a receiver would actually be good enough to double wattage as impedence is cut in half.
For example an HK 3485
120 Watts per channel, 20Hz ? 20kHz @ <0.07% THD, both channels driven into 8 ohms
150 Watts per channel, 20Hz ? 20kHz @ <0.2% THD, both channels driven into 4 ohms

Corrected. I was thinking about those 2k expensive Infinity Prelude subs and made a typing error.

My inflated power estimates versus ohms was based on some high end amplifiers I had looked at that had the same THD specs for their various ohm and power ratings and may have also been a little exaggerated from the manufacturers.

Here is a good technical paper that explains what you are referring to above. Texas Instruments Power Rating In Audio Amplifiers.

Some manufacturers use an average power rating, but at a higher distortion ratio obtained by amplifying the original input signal to a level where clipping occurs. At 10% THD+N, the average power rating is higher than at 1% THD+N.

and...

PMPO stands for peak music power output or peak momentary performance output. These terms are used interchangeably and have approximately the same meaning. PMPO has no well-defined standard of measurement and is not generally used in high-fidelity audio as a performance measurement.

In actuality, when manufacturers quote a PMPO number, it is often based on a theoretical calculation. A PMPO power rating has no reference point. The power supply used for a class-AB audio amplifier is much different than that for a digital audio amplifier (see Reference 1). For a class-AB audio power amplifier, PMPO can be quoted much higher than for a digital audio amplifier because of the physical properties of the analog components. The instantaneous voltage at start-up delivered by the power supply for a class-AB audio
power amplifier can be many times higher, thus producing a much higher power spike at start-up.

PMPO is often quoted using this instantaneous start-up voltage. PMPO is a great marketing tool, because the customers are usually looking for a higher power rating with lower-cost audio amplifiers.