I am conveting a lot of my cassettes to CD's. My computer has a
Turtle Beach card, and the deck I am using for cassettes is a
Nakamichi 700 Tri-Tracer. While trying to clean up the digitized
track, I realized there was not any hiss to hear. Maybe I do not hear
it becuase the computer speakers (and my normal speakers) are not
exactly audiophile quality. But still I could hear the hiss from the
previous low-end BX-100 Nak, as well as from boom boxes. Is Nak 700
Tri-Tracer of such good quality that there isn't any hiss? or I am
just missing it? Or is it my speakers?

Also, given that I cannot hear any hiss, should I still use noise
(hiss) correcting steps in the audio program (Audacity, in my case)?

Regards.
-Surinder