This is my program of choice due to the many and clear options of you for audio (just demux and remux, re-encode etc)
Using the Just Remux option you get the original DTS-HD or DTS Core streams in your mkv file and you can also convert to AC3. Staxrip can get both streams if you select the DTS-HD option or otherwise rips just the Core if you select DTS.Choose the mkv container and in the audio options add DTS passthrough. Handbrake also supports copying the Core stream.You can also demux the whole stream to Wave and then use Aften to convert to AC3.
Just select Core when you import the Blu-ray and then copy stream in order to get the original Core audio. Ripbot264 supports getting the Core stream.If you starting increasing the volume, especially in action films you can tell some difference, but as the DTS-HD whitepaper says the Core is also a very capable lossy format and given the huge bitrate of 1500kbps that it usually uses, in most cases you are fine just ripping the Core. Just to add my experience since I recently bought a DTS-HD sound system, if you listening to your movies in low - normal volume you really can't tell any difference between the lossless DTS-HD and just the Core.
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It will be easy to decode soon enough in any PC so take a minute and think about what you need. Of course if you are converting to mkv in order to store your movie, keeping the DTS-HD format is a good idea.If it supports (most likely it will) DTS-HD keep it, otherwise follow one of the options above. If you are copying a Blu-ray to AVCHD, check your Blu-ray player's manual.If you want to maximize compatiblity or reduce the size of the audio track you can convert to AC3 audio in a lower bitrate.For instance, you might be able to decode DTS-HD in your PC but instead you pass-through the audio to your decoder via an optical cable. Even if you keep the whole track, you will only listen to the Core, so just keep that and remove the HD audio. If you decode through your PC or you passthrough to a decoder that doesn't support DTS-HD you don't need both streams.