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One from Column dbx, One from Column CX Dear Editor: In his discussion of the CBS CX decoding system and the present dbx system in the August 1981 issue, Edward Tatnall Canby addresses the question of compatibility between dbx-encoded discs and non dbx-encoded equipment. However, he does not address the question of compatibility of dbx-encoded discs and the CBS CX system. In other words, will the CBS system decode dbx as well as CX discs? What shall it profit the audiophile to have a wide array of encoded discs available from a range of manufacturers if he must buy a separate decoder for each company's records? -Steven J. Haller; Oak Park, Mich. The Editor Replies--The CX decode system will not handle dbx discs, and this is the thought behind CBS trying to sign up other major record labels to use the system. They presently include Warner and RCA. To a great extent, I agree with your logic. E.P. Words Across the Seas Dear Editor: I'm Polish, 25-year-old girl and, since last year, an engineer. I write to you with great request for a pen pal. I'm a big enthusiast of music, as well as hi-fi and photography equipment. Because of the shortage of these things and information about them. I apologize for all mistakes I made in this letter, but my English still leaves much to be desired. -Danuta Rajpold, 97 300 Piotrkow Jnybunalslu u1. Sienluewicza 28 m. 38 Poland Addenda: THD Analyzer I have found that improved calibration tolerances result if the following changes in resistor values are made in the THD analyzer: R121: 910k to 1M; R124: 12k to 1 1 k; R179: 2.7k to 3.0k. (See "Parts List" on page 61 of the September issue.) The third sentence of the caption for Table 3 (page 58) should read, "R (E, F, G, H) should be 5%, 1/4-watt carbon-film types where each group of four like values should be matched to within 1 %." Robert R. Cordell Erratum: Laser Speaker Testing On page 43 of the September issue, the definitions for Equation 1 in "Measuring Speaker Motion with a Laser" were incorrect. The equation as given was correct, but the explanation should read as follows: E is the Young's modulus of the cone material, p is its density, Q is the semi-apex angle of the cone and Rb is its outer radius. We apologize to the author, G. J. Adams, and the readers for this error. (Source: Audio magazine, Nov. 1981 ) = = = = |
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