I am posting this on behalf of Rockford, which emailed CEoutlook the following comment:

Rockford Fosgate has been publishing the Dynamic Power Ratings in amplifier owner’s manuals since the Punch 200 DSM back in 1993. The Dynamic Power Ratings back then were measured with the AudioGraph PowerCube which measured a 1kHz pulsed tone for 20ms, then attenuated 20dB for 480ms at a constant voltage. In essence, the PowerCube replicates the real-world application of playing music while connected to a speaker.

Most Rockford dealers and reps who attended an RTTI class were exposed to the Power Cube and understand how Dynamic Power indicates “real-world” output. That is why they explain to customers “Rockford Fosgate amplifiers are under-rated, so look at the PVC (Performance Verification Certificate) to see how much power the amp really produces.”

Rockford believes that the Consumer Technology Association’s choice to include Dynamic Power as a standard rating is a great win for consumers. The CTA-2006 seal gives people confidence that power ratings are representative of an industry standard approach, not inflated numbers geared to sway consumers with unrealistic numbers on a box.

An important note to the above article is, at time of development of Rockford Fosgate’s M5 amplifiers, CTA-2006-B was the only test standard available, which includes this Dynamic Power Rating. The Dynamic Power standard continues into revision CTA-2006-C. This is referenced in the original Press Release which can be found at: https://rockfordfosgate.com/news/rockford-fosgate-begins-shippingnew-m5amplifiers/