Not really familar with Sony system. But most 5.1 sound system can decode 5.1 only for DVD play. For music and audio, 2 channel stereo is still the standard.
If the Sony has speaker A/B selector, you can put the external speaker on the B channel, just let the two external speakers hook to that channel. You will not lose any sound quality when play Apple music.
If the Sony has speaker A/B selector, you can put the external speaker on the B channel, just let the two external speakers hook to that channel. You will not lose any sound quality when play Apple music.
