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When two pure tones with the same frequency are combined, what is the easiest way to determine the doubled amplitude? add dB SPL As an

When two pure tones with the same frequency are combined, what is the easiest way to determine the doubled amplitude? add dB SPL As an example, if a pure tone sound is played from two speakers at the same time and both have an amplitude of 60 dB SLP, what is the combined amplitude? db SPL

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