Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site tektronix.UUCP Path: utzoo!linus!decvax!tektronix!kimr From: kimr@tektronix.UUCP (Kim Rochat) Newsgroups: net.audio Subject: Are all DADs alike? Message-ID: <1243@tektronix.UUCP> Date: Fri, 29-Jul-83 11:33:47 EDT Article-I.D.: tektroni.1243 Posted: Fri Jul 29 11:33:47 1983 Date-Received: Fri, 29-Jul-83 15:23:20 EDT Organization: Tektronix, Beaverton OR Lines: 24 In the July "High Fidelity" and the August "Audio" there are test reports on 4 digital disk players. Both reviewers had gotten the Philips test disk which has square wave and impulse tests. All fours reviews published oscilloscope photographs of the 1 Khz square waves and impulse tests. The 2 players reviewed in Audio demonstrated a large amount of ringing on the tops of the square waves and after the impulse. (I was vastly amused because the 2 DAD reviews were separated by a review of a B&O cartridge whose 1 Khz square wave response was vastly superior to either of the DADs). The 2 units reviewed in High Fidelity showed much better square wave performance (of course one of them was the Philips/Magnavox player, explaining what the tests were doing on the disk). Also, one unit in each magazine showed inverted phase on the impulse test. Audio also measured 2Khz/20Khz phase shift at 180 degrees for one unit. My question to all you digital-philes is "Are you going to pay any attention to these test results?" Presumably, all digital players) sound alike (read perfect) and you're supposed to choose one on the feature/price ratio. Are you going to buy the one that rings less and has correct phase and minimal phase shift? Are you going to audition the competing units and decide which one "sounds" best? Good listening, Kim Rochat tektronix!kimr