watts per channel into 8 Ohms, 70 watts per channel into 4 Ohms and had a Bridging switch enabling the user to bridge the internal stereo amplifiers into one mono amplifier, producing 160 watts into 4 Ohms. The Model II was followed by the IIC, featuring the same circuitry placed into a standard 19" rack mount chassis. The IIC introduced a new concept to the Audiophile marketplace, use of a separate external power supply for an amplifier. Users could choose from two models of external power supply, one as standard and an upgrade to a larger High Current version. The concept of an external power supply was first introduced on the PS Audio IV preamplifier and later applied to power amplifiers like the IIC. The concept became known as the High Current Power Supply or HCPS and was popular because improvements to the sound quality were gained by moving to a larger power supply, both in the application of the preamplifier as well as power amplifiers. The model IIC is factory rated at 55 watts into 8 ohms and 200 watts bridged mode (400 watts into 4 ohms bridged). The IIC Plus is rated at 70 watts into 8 ohms. Amplifier successors to the IIC included the 250 Delta monoblock and the 100 Delta amplifier. In the early 1980s and with the advent of the Compact Disc, PS was one of the first American high-end audio manufacturers to modify one of the few CD players of the day by replacing its internal audio amplification stage following the internal D to A player. The first and only modified CD player introduced by the company was the CD-1 based on the Philips Magnavox line of CD players. The company engineers chose the Magnavox unit because the belief at the time was it sounded better to its only rival in the marketplace, the Sony. Inside the CD 1 PS engineers added a discrete high voltage line stage and power supply, replacing the NE5532 op amps used as the output amplification stage of the Magnavox. This unit was a stopgap product designed to get the company "in the game" of this new format that would someday challenge vinyl, the company's core products addressed. In the background, PS engineers were working to figure out a way to utilize the CD players digital output and create a standalone D to A converter. In late 1982, the