CD output level help.

A while back I bought the DVD of the Led Zepplin Kennedy Center Honors but being a DVD it won't play on my CD transport. I forget how I did it but I was able to copy the music from the DVD to a CD but the output level is about 18 db lower than a standard CD. Where as I don't need a line stage to listen to my other cd's if I play this one I have to use my Bottle Head line stage at almost full output ! Would there be an easy way to duplicate my CD but raise the output about 20 DB ?
 
Yes, of course, but you "shouldn´t" need to do it in the first place.

In principle your DVD Audio should have been recorded at a "normal" level, call it "0 dB" if you wish, not certain on DVD standards without checking them but that is the general idea, and DVD ripping software which extracted "just Audio" from it must be setup to keep that signal level and properly record it at standard "CD 0 dB" too ... just like all your other CDs.

Apparently it did not happen, your recording is flawed, rather than applying a "band aid" re do it again, paying attention, there must have been some adjustment you missed.

-18dB loss is GROSS and that CD is unusable.

EDIT: please describe what you did.
 
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Audacity also has a "normalize" function which will set the peak level to 1 dB below maximum.

I'd rip the disk with Makemkv, then demux the audio tracks with MKVToolNix. Then convert the audio to 16/44.1 wav using Eac3to, since even if it's PCM, it'll be 48k sample rate. (All that software is free.)

Or I'd go to a thrift store and buy a DVD or Blu-ray player for under $20, or pick one up from the sidewalk.