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You seem to have the answers already, but I'll add two bits anyway. The outputs are usually highpass filtered, as you've noted. You don't get full range, which is handy if you need the low bass removed from the smaller speakers in your system. This is easy to implement with the 'high level' inputs/outputs. The 'low level' outputs are a different story. Some are high pass filtered, some are not. The ones that are highpassed are a nice option if you're system is capable of utilizing them. They require a preout/prein loop somewhere before amplification, and unfortunately it's a feature that's being phased out on reasonably priced equipment. Obviously, if the low level outputs are highpassed, you can't use them to daisy chain to another sub amp (which is a parallel connection btw). If they are just a 'pass through', then it's pretty much a splitter builtin for convenience.
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