DCM Time Frame TF1000 loudspeaker
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.
For anyone who wants to be up to date on all the audio products available in North America, Audio's Annual Equipment Directory is an indispensable source of information. (So is the publication you're reading now, of course.) The 1992 Directory (aka Audio's October issue) arrived when I was finishing up the review of the Acarian Alón IV (see
New England Audio Resource's NEAR-50M is a cyborg: metal innards in a wooden body. It represents NEAR's top statement in the firm's Metal Diaphragm Technology speaker line, which features the "NEAR-Perfect" driver cone. Metalin this case an anodized aluminum alloyis much more rigid than paper or plastic. Hence, a driver with a metal cone acts more nearly as a true piston. When it comes to loudspeaker cones, breaking up is not hard to do. When that happens, the cone flexes in a complex pattern, generating harmonic distortion. A typical plastic or paper 8" woofer may experience its first breakup mode at a frequency as low as 500Hz. The NEAR 8" metal-cone woofer's first breakup mode is said to be well above 2kHz, and their 4" metal-cone midrange does much better than that.