Connecting Panasonic DMP-BD55 to SA-HT520

Hi and welcome to FixYa,

Offhand specs to my understanding are:

• Panasonic SC HT520 - Connector Type: S-Video output (4 PIN mini-DIN) - Composite video/audio input (RCA phono x 3) - Composite video/audio output (RCA phono x 3) - Component video output -Audio line-in (RCA phono x 2)
• Panasonic DMP-BD55 Blu-ray Player - Video outputs: HDMI (1.3), component, S-video,Audio outputs: L/R analog, 7.1-channel analog, optical digital, coaxial digital

• video - composite;
• audio - L/R analog

The digital video processing takes finite time to execute and must be synchronized with the audio portion of the incoming signal to ensure that both video and audio are synchronized and no delay is perceived. Most HDTV have compensation to ensure that the audio and video are properly synchronized However, many consumers will likely process the audio separately in a surround sound system. HDMI 1.3’s lip synch feature allows the audio and video signal to be synchronized to external HDMI devices.HDMI 1.3 has also added an optional mini HDMI connectors so handheld HD video devices such as HD video cameras can also utilize HDMI for HD connectivity.
you can get the required wires/cables and connectors from
radioshack wbsites.

Welcome to Fixya! You should be able to Connect these Unit's Together assuming that you have the Correct A/V Cables. You will need Video, Audio Connectors.