I really wish the Sonos Amp software would support true low-level output for subwoofer and not just LFE like today. I would like to use the crossover filter on my sub instead of the filter in the Amp. I’d like to send full range to my front speakers even with a sub connected, as my fronts can go a lot deeper than the 50 Hz which is the minimum crossover in the Amp settings. The filter in the Amp also color the sound pretty badly. I don’t know what kind processing it does, but the sound gets bright and muddy.
Since the Amp is a product not aimed at the most average consumer, but someone with at least slightly higher demand on sound quality, I really think the option to bypass the built-in filter of the Amp should be enabled. You don’t need to be an audiophile to appreciate that.