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Read my post again: 'Where dual channel amps are used to separately power dual subs the signal content is the same to both.' Dual amps are often used to power dual drivers when the load impedance of dual drivers parallel wired would be too low for a single amp to handle. The low frequency content sent to both amps is the same. That's because "Low frequencies have been summed to mono in the studio on virtually all recordings since subs first came along in the 1970s." Stereo only exists in the midbass and higher frequencies, where the content of the left/right channels is different.
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