In the past, most DVD Audio and SACD players lacked bass management. I don't know whether or not the Oppo has bass management ability for multichannel or stereo for that matter.
I suggested the Reckhorn for 2 channel analog bass management. I use it and like it. I used to have an Outlaw ICBM-1 which allowed 5 channel bass management. They are out of production, and are analog-only as I recall, but you may want to check ebay for one of those beauties. (Stereophile used to rate the ICBM as a Class B component - which is for them a very high rating.)
Of course, I suppose you could get 4 Reckhorns, and 4 subwoofers for a wild 7.4 system. OK, time for bed. G'bye.
