(a) That any other power output is rated by the manufacturer, is expressed in minimum watts per channel, and such power output representation(s) complies with the provisions of § 432.2 of this part; except that if a peak or other instantaneous power rating, such as music power or peak power, is represented under this section, the maximum percentage of total harmonic distortion (see § 432.2(d) of this part) may be disclosed only at such rated output: And provided further,

(b) That all disclosures or representations made under this section are less conspicuously, and prominently made than the disclosures required in § 432.2 of this part; and

(c) The rating and testing methods or standards used in determining such representations are disclosed, and well known and generally recognized by the industry at the time the representations or disclosures are made, are neither intended nor likely to deceive or confuse the consumers and are not otherwise likely to frustrate the purpose of this part.