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Join Date: Mar 2007
Location: Long Beach, California
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As Sandeepkor said, it all depends on whether your Marantz supports FLAC. Most DLNA players do not. If the Marantz does support FLAC, you are good to go. But if it doesn't, Twonky will transcode down to MP3, and since it needs to do it in real-time, it will probably be a low bit-rate.
Unfortunately, DLNA tries to hide the fact that it is transcoding (actually, it is trying to make such details transparent), but Twonky creates logs that should let you know what it is doing. Also, the Marantz might indicate what it is receiving through DLNA.