two-channel vs stereophonic

two-channel and stereophonic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
two-channel	No	Yes	No	No
stereophonic	No	Yes	No	No

As adjectives, two-channel and stereophonic are synonyms defined as:

two-channel and stereophonic: designating the reproduction of sound using two or more independent audio channels

Other synonyms of two-channel include stereo.

two-channel (adjective)	stereophonic (adjective)
designating the reproduction of sound using two or more independent audio channels	designating the reproduction of sound using two or more independent audio channels