The ULTIMA range is Chord's reference amplification, from the Ultima Pre 3 preamplifier to the Ultima 780W reference mono blocks. All ULTIMA amplifiers use dual feed-forward error correction with proprietary matched MOSFETs and 70 kHz switch-mode power supplies. Stereo amps: Ultima 6 (180W), Ultima 5 (350W). Mono blocks: Ultima 3 (480W), Ultima 2 (750W), Ultima (780W). Call-to-order products.