DDFA designs are comprised of three elements; ZXCZM800 multi-channel digital modulator IC’s, ZXCZA200 feedback processor IC’s and high performance Class D output stages. Combinations of these elements are used to create high performance amplifiers achieving a THD+N of less than 0.004% and dynamic range of 118dB. Data sheets for the products can be made available subject to completion and approval of the following qualification document: