Before Lumen and Lux, there was RMS Confusion
Do you remember PPI Art Series amplifiers for mobile audio? As you may recall, the RMS watt rating that was on the package is what you got.
Then the market started changing. Overseas factories raced to have the lowest cost highest RMS rated amps as possible and we discovered that the RMS wattage that was advertised wasn’t always what you got to your speakers.
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