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From what you wrote, I believe that your issue is with this Sylvania player and that needs to be looked at by Sylvania. But, let us explore the following.
Please confirm if your report of Syvania "no sound" for this DVD-VIDEO on DVD disc is really "low sound" as opposed to "no sound".
You say that your Premiere Elements 12 project's audio meter shows audio activity at -6 to -12 dB at playback
of your Timeline in the Edit area monitor.
a. Set the project's Timeline audio at 0 dB or 1 dB and take the Timeline content to DVD-VIDEO on DVD disc.When
you play back this DVD, do you get sound in both Sylvania player and the laptop's player?
For later discussion, thinking about Gain and Normalize for audio adjustment.
More later.
ATR