Occasional extra whining from engine

[CJ_Boxster]

You know it could be alternator noise.

I still use factory cdr210 radio. stock speakers, sound isnt coming from the speakers. It literally sounds like im at 4000 rpms when im at 2800 rpms most the time i drive.

Do you think it could be my battery craping out alittle causing the alternator to whine?

I do notice that the radio will cut out sometimes for a split second when the engine bay fan or the air-injection pump triggers on.