Soundtrack support is comprehensive on the Sony BDP-S550. It has onboard decoding for all high-resolution soundtrack formats, including Dolby TrueHD and DTS-HD Master Audio, so you don't need a new receiver to take advantage of the improved audio quality. The player can also output high-resolution soundtracks in bit-stream format, so you can opt to let your AV receiver handle the decoding duties itself. There should be absolutely no sound-quality difference between the receiver decoding the soundtracks or the Blu-ray player doing so--and we've never heard any difference ourselves--but some people just like to see their receiver's "Dolby TrueHD" indicator light up.

Connectivity is excellent on the Sony BDP-S550. The HDMI output is the most important connection, capable of outputting high-def video up to 1080p resolution, as well as high-resolution multichannel audio. There's also a component-video output, which can output Blu-ray Discs at 1080i and DVDs at 480p, along with legacy composite-video and S-Video connections. Audio connections also include both optical and coaxial digital-audio outputs, and those with older receivers will also be pleased to see 7.1 analog-audio outputs. There's also an Ethernet port in the back (but no Wi-Fi), which can be used for firmware updates and downloading content for BD-Live-enabled Discs.
Blu-ray performance
For our Blu-ray tests, we compared the BDP-S550 to several standalone Blu-ray players, including the Samsung BD-P2550 and Panasonic DMP-BD35. We started off by looking at test patterns from Silicon Optix's HQV test suite, with each player connected to the Samsung PN50A650.
First we looked at the Film Resolution Loss Test, and the BDP-S550 handled the shifting test pattern perfectly, showing all the detail without any image instability. It also did a good job on the second part of the test, showing no moire as the camera slowly pans across the empty Raymond James Stadium. Next up were a few video-based test patterns, which we consider less important because few Blu-ray Discs are video-based. While the BDP-S550 showed all the detail on the Video Resolution Loss Test, there was a strobe-like flickering in the most detailed part of the test pattern. It did better, however, on the next two jaggies tests, clearly rendering both a rotating white line and three shifting lines.
Next, we looked at some actual program material, and we started with a few discs we know often give Blu-ray players problems. First up was the beginning of chapter 8 from Mission Impossible: III and the BDP-S550 looked great, with the stairs in the background free from the moire that we often see on lesser players. Chapter 16 also looked good; the trimming on the limo was jaggy-free as it approaches Tom Cruise. We switched over to Ghost Rider and the BDP-S550 continued to perform strongly; the grille of the RV was smoothly rendered as the camera panned away at the very end of chapter 6. We also looked at Tony Bennett: An American Classic--which is video-based and mastered at 1080i--and the BDP-S550 again proved its mettle, performing as well as the DMP-BD35, PS3, and Samsung BD-P2550. Overall, the BDP-S550 has excellent image quality, comparable with other top performers.
We also tested disc-loading speed and the BDP-S550 had average performance. Mission Impossible: III loaded in 25 seconds with the player on, and in 34 seconds with the player off, which is a little bit slower than the DMP-BD55. Movies with BD-Java menus took considerably longer, with Pirates of the Caribbean: Dead Man's Chest loading in one minute and 50 seconds, and Spiderman 3 loading in 1 minute and 40 seconds.
DVD performance
Home theater fans still have sizable DVD collections, so we put the BDP-S550 through our DVD testing suite. First up was Silicon Optix's HQV test disc on DVD.
On a resolution test pattern, the BDP-S550 displayed the full resolution DVD is capable of, although we did see some image instability in parts of the picture. Next up were a couple jaggies tests and the Sony passed them with ease, with very few jaggies on both a rotating white line and three shifting lines. The BD-PS550 also handled the difficult 2:3 pulldown test; there was no moire in the grandstands as the race car drove by. Finally, CNN-like scrolling text was jaggy-free, along with vertically scrolling credits. Overall the BDP-S500 performed well with test patterns.
We also looked at the some program material. We started with the introduction to Star Trek: Insurrection, and the BDP-S550 showed off its 2:3 pulldown prowess by smoothly rendering the curved lines of the bridge railings and boat hulls. We switched over to Seabiscuit, and the BDP-S550 held its own again, showing relatively few jaggies on the difficult opening sequence. We were able to flip back and forth between the Samsung BD-P2550 to get a direct comparison and while we generally favored the image quality of the BD-P2550, only videophiles will notice the minor differences.
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