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The discs I have been burning will play on a 10 yr old boombox, a 2 yr old alpine car stereo and a 10 yr old kenwood turntable player. They will not play on my jvc dvd player (which will play retail cd's) or the stock player in my 1996 GMC Jimmy. Anybody know what the problem might be? Thanks in advance.

2 things will improve audio compatability, limiting the disc to 74 min or less, and using cyanine or azo media. Some audio players will not accept any 80 min CDR's even if less is written to them. Some audio players will not read CDR's at all.

Thanks for the quick reply. I have been using 80 min discs, so maybe that is the problem. How do you tell if the discs are cyanine or azo media?

How do you tell if the discs are cyanine or azo media?

Check the ATIP with any of the available tools. In the USA, media from Fuji is cyanine if it's made in Japan, and Verbatim Data-Life Plus is azo.
The Verbatim Vinyl discs are an older type azo that is dark blue and often works in finicky audio players.

And of course,

Using VariRec on the Plextor Premium or Advanced AudioMaster on the Yamaha CRW-F1 should increase compatibility.

should increase compatibility

Perhaps you can share some your personal experience on how this has worked for you. What "increased compatability" have you seen with this?
And how does this help the OP will his problem?

I don't have any personal expirience with either VariRec or Advanced AudioMaster increasing compatibility, but I do know, that they are both supposed to increase compatibility.

I had a JVC settop DVD player that would not play any CD-R media and I upgraded to a JVC model that supports CD-R, CD-RW, MP3, and SVCD and now they play fine. Now, to find someone with a Plextor or Yamaha to burn me a disc to see if they play in the old player. I'm betting that they will not.

I don't have any personal expirience with either VariRec or Advanced AudioMaster

No kidding....