* The simplest way is to connect the analog AV output to an AV receiver/amplifier. This way you can play the stereo area of SA-CDs.
Note: some SA-CDs are stereo only but the majority of titles contain a stereo and a multichannel recording. These are stored separately on the disc. A handful of titles contain a multi-channel mix only.
* The best way to enjoy SA-CDs on PS3 is by connection the console to an AV receiver through HDMI. Not all receivers are suited for this – not even all with HDMI input but most, especially recent ones. See ‘What receiver should I use?’. PS3 outputs high-resolution PCM (24-bit, 176 kHz or lower, depending on your receiver's capabilities).
This way you can enjoy the full benefit of multi-channel music from SA-CD.
A Sony PS3 with firmware upgrade 1.60 or later has the ability to play back DSD Discs through a home theater receiver. To take full advantage of the PS3's DSD Disc playback, you'll need a receiver which can process audio over HDMI, a feature usually found in higher-end equipment. HDMI-passthrough is not the same. If the connection between the PS3 and receiver is HDMI, the PS3 converts the DSD audio files in realtime to 24-bit/176.4 kHz PCM and sends it to your receiver.
Streaming of the pure DSD signal would be very preferable over conversion to PCM but unfortunately (at this moment) PS3 does not support that.
Why not?
This is a mystery. Standards and regulations permit it. HDMI from versions 1.2 and up can transmit DSD securely with HDCP (High-bandwidth Digital Content Protection) and PS3 is claimed to be compliant with version 1.3. We can only hope that there are no PS3 hardware constraints here and that Sony will issue a firmware upgrade in the future that enables this function. Sony has already released AV Receivers that accept DSD input. Likely, the constraint is however in the HDMI chip; even in the new one used in PS3 Slim.