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Hi Bob, thank you for your question. Marshall uses the SPL rating to measure the loudness or power of a speaker. SPL (Sound Pressure Level) measures a speaker's loudness in decibels (\(dB\)), while wattage measures the power a speaker can handle without damage. A higher SPL rating indicates a louder speaker, but wattage alone doesn't determine loudness; a speaker with a higher wattage rating can handle more power without distorting or breaking. For comparing speaker loudness, SPL is the more accurate metric, as a small increase in SPL requires a significant increase in wattage. The Emberton III has an SPL rating of 90 dB SPL at 1 meter.
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