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Audio quality is reasonable for built-in speakers, but if you want surround sound you'll want to invest in your own separate speaker system.
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Sound Quality (6.0)
Audio quality on the Panasonic TC-37LZ85 is generally good. Sounds were clear and we got a good range. Unlike some HDTV speakers we didn't notice any problems picking up detail in the sounds and conversation was clear even in loud scenes. We were quite happy with the audio quality from the Panasonic TC-37LZ85.
Surround Sound (4.0)
Like most modern HDTVs the Panasonic TC-37LZ85 offers a simulated surround sound mode. When we turned this feature on we noticed a little bit more depth to the sounds, but aside than that there was no major difference in sound quality. It certianly did not provide the same level of immersion we got when we set up an inexpensive surround sound system. If you want to significantly improve the audio experience with the Panasonic TC-37LZ85 we recommend you invest in such a system. Even a cheap set of speakers will be better than the simulated surround sound.
Loudness (8.02)
To see how loud the Panasonic TC-37LZ85's speakers get we played back pink noise with the volume turned up to maximum. We measured the Panasonic TC-37LZ85's speakers at a volume of 80.2 decibels from a distance of five feet. This is at the quieter range of what we've seen for an HDTV but should still be quite loud enough to fill up even a large room with audio, although of course you will also get some degraded quality as the volume goes up. The lower volume is likely related to the fact that the Panasonic TC-37LZ85's speakers are on the back of the HDTV.
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