The availability of “true multi-channel” recordings varies by music genre. There are countless modern recordings of classical music that feature surround-sound. I play classical music recordings via Blu-ray, Pure Audio Blu-ray, Ultra HD Blu-ray, and SACD discs that feature hi-res audio (e.g., 24bit/192kHz or 24bit/96kHz PCM, or DSD) and 5.0 or 5.1 surround sound. I list a few examples in these posts:
My Oppo UDP-205 player serves as a “universal disc player”, and has pre-amp functionality built-in, including audiophile grade DACs. I connect vintage tube amps directly to the Oppo. I combine the Oppo’s surround-left and surround-right analog line-level outputs into a single rear channel via an RCA Y-cable. (Oppo confirmed this is OK.) One stereo amp drives the front L&R speakers. A second stereo amp drives the center and single rear speaker. In this 4.2 system, L, C, and R speakers are Klipsch RF-7II. The single rear speaker is an RF-7. Subwoofers: SVS SB16-Ultra, Klipsch R-115SW.
In this 4.2 system, I can choose from the following tube amps: Scott 296, Scott 272, Fisher KX-200, McIntosh MX110Z tuner/preamp driving a Scott LK150, Inspire “Fire Bottle” SE Stereo Tube Amplifier HO, Scott 222C, Pilot SA-260.
This combination of state-of-the-art hi-res surround-sound digital recordings, vintage tube amps, and large Klipsch speakers sounds fabulous, IMO.