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Crown XLS Class D - Speaker Output Ground Referenced or Not?

I'm looking to connect the outputs of a Crown XLS series amplifier (running in 2-channel mode) to the high-level inputs of powered subwoofers in a 2.1 home audio system. Some Class D amp designs are such that the (+) and (-) outputs are offset from ground by a large DC voltage (e.g. 24 VDC). This does not pose an issue for conventional enclosures, but it can pose an issue for a powered enclosure when using the high-level (speaker level) inputs. I believe this may be an issue mostly with older designs, but I would like to know for certain if the output of the Crown XLS series is referenced to ground or not before moving forward.

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