If you have one preamplifier that is connected to two power amps in bi-amping to the speaker. How do you then know that your 50W and 300W power amplifiers plays the same volume through the speaker?
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The drivers would have to be tuned using [pink noise](https://en.m.wikipedia.org/wiki/Pink_noise) and a measurement microphone to ensure balance and gain. If a system includes bi-amping a 50w and 300w driver, I’d assume the former is a tweeter and the latter is a woofer. I would tune each individually to ensure they’re producing balanced tones within the range that they’re each responsible for.
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