Importing files to iMac

it’s been suggested I should use uncompressed AIFF. But iTune AIFF is limited to 48 kbytes.

A Redbook CD’s sample rate is 44.1 kHz, which is 1411 kbps. With itunes, use AIFF encoder, click on Import Settings, then use Custom.

https://support.apple.com/kb/PH12279?locale=en_US

I've been confusing kHz with kbps.   iTunes offers 48 kHz at 16 bits for AIFF.  Thanks.

Don't rip with iTunes. Download free XLD for mac. It will get you bit perfect rips into AIFF with greater accuracy than iTunes. Use error correction option. For really scratched discs use 1x or 2x speed; it will usually still work, just a bit slower. After each rip it will create a log that confirms details of the results. Scroll all the way to bottom and usually you will see "No errors". Cheers,
Spencer