We do something similar, but not with wireless. I run both the LFE and High level signals to a pair of REL subs from the 205. The speakers are set to small, but at a fairly high crossover (70Hz). For stereo, the REL's take over below 70 Hz, for movies they blend in the LFE signal as well (which is adjustable on the REL). Works great.
The LFE (.1) output is not affected by the crossover frequency - it is an independent signal (and not mixed in with the L/R signals). There is quite a bit of good info on this topic on the OPPO forum at AVS - Bob Pariseu is something of an OPPO guru - check his early posts.
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Main - Roon on Synology/Sonos Port/SoTM Neo endpoints; Chord Qutest, Bryston BP-17 cubed with phono option; EAT C-sharp with Ortofon Bronze MM, Bryston cubed Amplifier; Revel F126Be on custom Atocha stands; interconnects by WireWorld, furniture by Atocha Design 'Phones Audeze LCD-3, Bryston BHA-1; Office: Sonos/Roon; OPPO HA-1, Naim NAP100 and PSB Mini-C. Media Room:, Samsung QLED QN90 series, Sonos, OPPO 205, ATI N-core driving KEF LS-50's with REL subs; furniture by Glassisimo; Kids - U-turn for vinyl, Sonos Play5; Summer Shack - Sonos, vintage Pioneer, Dynaudio Special 40's.
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