CDR is NOT the same format as regular Audio CD, and although some older units with good lasers will see the disc, they will strain to see the smaller format as used for computer data.
CD-R is a media type Dave, not a format. It doesn't matter what is on the disc, only that it is recorded correctly if you want it to work.
Killerwatt, if you ask Dave nicely, He's got a Warehouse full of confiscated Bose units He'll let you have a lot cheaper.

No - you are mistaken.
Disc media may appear similar to the eye, but construction and format are also very very different.
I'd beg to differ Dave.
Media type is just that (eg, CD-R, CD-RW), while the format is the standard (Red book, Green book, Orange book, etc) used during the writing process.
I'm not disputing that one make of CD-R will perform differently from another because there is some real cheap crap out there, that's why I told the OP to buy decent media and make sure he is recording the disc in the format the 2006 can read (CD-DA in this case).
In laymans terms, consider the cdr format to be a bit like an old fashioned low level format (before intelligent drives came along). If the drive cannot read this, whether for physical or firmware reasons, it don't matter what format you put on top, the drive will struggle.
As it happens, redbook defines the 'low level format' specs, and cdrs do NOT meet it.
Often a drive can read it physically (just), then obviously the firmware can sort out the 'Audio CD' format part.
The problem comes when older drives, such as all factory fit Omega ones, are barely able to get the focus right on the smaller 'pits', putting extra strain (outside of original design) on the laser focussing, and killing the laser. Phillips lasers seem particularly prone.
I too have had much success with cdrs, but I see an awful lot of NCDC series (as I'm able to decode/depair) with buggered lasers. I suspect Dave DND sees an awful lot more, seeing as its what he does

I try to use originals now, both in the omega (cdc3 changer) and the rover (Philips rc026?), but if i do use a cdr, I do concur on quality media, and 1x burn (yes i still have a pioneer that can 1x cdr). no idea if it makes a difference, and certainly the rover's changer is failing again
