The last few years have seen a flood of new integrated amplifiers in an audiophile market traditionally wedded to separate preamps and power amps. That might reflect the fact that integrated amps make a lot of sense, and not only because they usually cost less than equivalent separates. The latter gained a foothold in audio's Paleolithic era, when tubes were the only game in town. Tubes generate lots of heat—an enemy of electronics—and separating the preamp stages from the output devices kept this under control. Yes, there were integrated amplifiers back then, but they were generally of very low power—25Wpc was once considered monumental.

It is almost ten years since I last heard a pair of DCM loudspeakers, the Time Windows made famous by writer Peter Aczel in the first incarnation of his magazine The Audio Critic. The "Time" nomenclature traditionally used by DCM in their models refers to the fact that for any hi-fi component, its performance in the frequency domain is related to, and implicit in, that in the time domain, the two being connected by the mathematics of the Fourier Transform. To put it in simplistic language, a speaker's impulse response can be translated directly into its frequency response: all the information needed to show how its response varies with frequency is contained in the shape of the impulse it produces.