Revision is therefore always the start of our work, but the Quad equipment is ideally suited for modifications, for example, adjustments that are needed for connecting modern signal sources such as CD players, DACs and Streamers. Sources that simply did not exist at the time of most Quad designs. Modern speakers also place different demands on the power amplifiers. Impedances of 1 ohm are no longer exceptions, while "before" the norm was 8 ohms. In addition, there are much better components for sale. Why didn't Quad make these modifications? Partly this was done, Quad still exists, and produce modern products which meet all requirements, our motto; What used to be good is still good, brings us to adapting that "old" equipment to modern times. This also prevents equipment from ending up early in the bin. Instead of making all kinds of modifications to existing printed circuit boards, JPE produces complete modules for a number of models that are placed in the existing chassis.