The Crutchfield blue CR2x50 & CR2x75 old school vintage amps are a pair of amplifier models manufactured by Crutchfield in the United States. These 2-channel amplifiers, known as the CR2x50 and CR2x75, are considered old school vintage models, catering to car audio enthusiasts who appreciate classic design and sound quality. With the Noyes modifications, these amplifiers are sure to deliver a unique and nostalgic audio experience for those looking to add a touch of vintage flair to their vehicle's sound system.