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PurePath HD open- vs. closed-loop performance

Other Parts Discussed in Thread: TAS5631

In the Mid/High-Power Amplifier product selection guide, a distinction is made between open-loop and closed-loop power stages. For example, the TAS5631 is "closed-loop", whereas the TAS5261 is "open-loop". I couldn't seem to find any documents describing the performance differences. Can someone help?

Thanks!