Hi - the response to your question re, "intrusive to the original signal" is to use a passive ("line-level") or active, analogue xover. The passive is the easiest implementation, all you need are the electronic characteristics of the source & the load and from there it is very easy to design the high-pass you want. Many free apps online will give you the standard LCR values for your LR 24.
Why not ask Benchmark themselves?
OTOH, as you suggest, you could leave it alone. That, and enjoying the music, would be my recommendation.