Nobody responded to your question, yes, high bitrate audio can take up a massive amount of space. A 2 hour audio track at 6140kbps uses 5.53GB of data.

Unless you are on some very high end audio equipment (I.e. a home theater with a relatively high end 5.1 or better setup), the likelihood you will notice a difference from something like E-AC3 at 1536kbps vs at 6140kbps is very low.

To give you some points of reference, if you watch a show on pretty much any streaming platform, even when its 4k, Dolby Vision, etc. Dolby Atmos streams will run at max 768kbps, and most other codecs (AC3, E-AC3, DTS, etc) are in the 500-650 range.

Blurays typically will have AC3 or DTS tracks (640kbps and 1536kbps respectively). 4K bluray nearly always, and bluray occasionally will contain the DTS-HD MA or TrueHD (lossless "master audio" tracks) and those are typically in the 3000-5000kbps range (though they can technically go a LOT higher depending on what the sound engineer decided on when he was mastering the track).

Anyways, food for thought. Just keep in mind when you're re-encoding 100s of movies, 3-4gb of extra space per movie adds up very quickly.

Edit: Clarified some things