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An amplifier is a hardware device based on circuitry that takes a signal level electrical signal and amplifies (increases) it to a level sufficient to power a speaker.

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Why is 1000W pro Amp delivering less SPL than 100W cheap amp?

Don’t have time to write a really good answer right now, but max output power is not the same as gain. I couldn’t find either a gain (in dB) or an input sensitivity (in volts) for those amps, but I pr …
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