Options Encoding
Here you can set the default encoder (audio file format) when ripping, converting or recording
If your source is lossless ripping to a lossless format is the best strategy.
I prefer FLAC.
The Quality Setting has nothing to do with quality.
FLAC is lossless. Period.
It tells the FLAC encoder how much resources it is allowed to spend to find the best possible lossless compression.
A 4k padding block reserves space for tagging in the header of the file.
This avoids having the file rewritten each time you add a tag.
If you use FLAC for playback don’t use the OGG transport layer
Which should I use, (native) FLAC or Ogg FLAC?
The short answer right now is probably "native FLAC". If all you are doing is compressing audio to be played back later, native FLAC will do everything you need, is more widely supported, and will yield smaller files. If you plan to edit the compressed audio, or want to multiplex the audio with video later in an Ogg container, Ogg FLAC is a better choice.
Although I am a JRiver fan boy I hardly use the ripping or the file conversion options of JRiver.
dBpoweramp does a better job.
It supports AccurateRip and has more and better internet resources for tagging including AMG.
AMG (All Music Guide) is one of the very few internet databases I know having a good support for tagging classical.
Likewise format conversions are faster and less error prone using the dBpoweramp audio converter. JRiver seems to have problems when running multiple conversion streams at the same time.
Encoding Settings - JRiver Wiki