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  • when buying a new or used CD/DVD player

    In many cases, data loss is a major cause of sound distortion in current models of CD and DVD players. So, when buying a new or used player make sure you test for it. With CD-CHECK the test is easy, and since it takes only 20 seconds you can do it right in the store. First, select the CD players you like based on price, features, and sound characteristics. Then choose the player that passes the highest Check Level with the fewest errors (e.g. clicks, interruptions).

    Theoretically, CD players should be able to perfectly correct errors up to 2.47 mm across. In practice we found some players capable of correcting 2.0 mm errors. CD-CHECK simulates realistic errors of 0.375, 0.750, 1.125 and 1.500 mm. In order to cope with manufacturing errors and dust, scratches and fingerprints CD or DVD player should be able to pass at least Check Level-2 with 0.375 mm errors. Our recommendation will be to get a player which will pass at least 0.750 mm or 1.125 mm errors. You will find that there are many players which are only capable to play Check Level-1 or Check Level-2 on the CD-CHECK disc. And that is when they are new. With time their performance will dip below the acceptable level.

  • to evaluate existing CD, DVD and CD-ROM players for data loss

    CD players detorierate over time. Protect your audio investment by detecting pickup defects early. Use it to determine when pickup adjustments are needed. Use it to check the adjustment effectiveness. Test your player especially prior to warranty expiration. If you are a service shop technician use CD-CHECK to help you with the rapair process.

  • to determine if the laser lens needs cleaning

    Dirt accumulates on laser lanses of CD, DVD and CD-ROM players and recorders. There are CD-based products that will clean dirty lenses. (Only high-quality products should be used since low quality products can damage the lens after repeated use.) Some cleaner manufacturers recommend cleaning the lens after every 8 hours of playback, which we consider unnecessary. CD-CHECK will determine whether the lens truly needs to be cleaned, saving it from potential abrasions caused by unnecessary - and repeated - cleaning. CD-CHECK can be also used after the cleaning process to check its effectiveness.

  • to evaluate the safety and effectiveness of sound-enhancing technologies

    Many gadgets and gizmos that enhance the sound of CDs/DVDs are very difficult to test objectively. Therefore, many evaluators rely on subjective audition tests, which can be very unreliable. Many of these sound enhancing technologies claim that they improve signals. Since they mostly affect only the digital signal, CD-CHECK can be used to evaluate them objectively and simply. If any of these technologies improve the playback of CD-CHECK's test signals, this clearly indicates that they reduce the number of errors generated, which in turn can lead to better sound quality. But, if no change is observed, it means that a given technology does not work in this particular instance.

    Sometimes these sound-enhancing technologies actually cause the sound to deteriorate. They can even harm a player's mechanical systems, which could lead to premature mechanical failure. Some reviewers will probably hear the difference, and might even prefer distorted and interpolated sound over the real thing. Internal tests at Digital Recordings and by our associates indicate that this may be the case with some technologies. But we prefer undistorted and faithful sound reproduction -- and we're sure that you do, too. With CD-CHECK, you can be sure that's what you're getting.

Empower yourself with CD-CHECK !
Do not expect manufacturers, sales people and audio magazines to represent YOUR interests !

Digital Recordings supplied the CD-CHECK disc, free of charge, to most of the audio magazines. Some are using the disc in their equipment reviews, others decided to ignore it and continue supplying you with false data regarding the CD and DVD players performance.

So, if you are looking for a player that offers 100% of music and not just an approximation you need CD-CHECK to test the player yourself.

Furthermore, you should remember that CD players vary in quality from sample to sample and from manufacturer to manufacturer. There are vast differences between players often not related to the price of the player. Crucial to this performance diffrence are the CD transport mechanisms. They vary in price from $15 to $250. Some manufacturers are trying to save money and some have inadequate test procedures and quality control. (Recently we heard of a $10,000 CD player from a reputable manufacturer poorly performing on the CD-CHECK disc.)

Make sure you are buying a player capable of reproducing 100% of music. Use CD-CHECK !

List of audio magazines which have CD-CHECK disc(s):
- "Absolute Sound"
- "Audio Amateur"
- "Audio Critic"
- "Audio Electronics"
- "Audio Ideas"
- "Inner Ear"
- "Recording"
- "$ensable Sound"
- "SoundStage!"
- "Stereophile"
- "Stereo Review"
- "UHF"
- "Ultimate Audio"
- "What HI*FI ?"

List of some audio manufacturers who have CD-CHECK disc(s):
- Philips
- Panasonics/Technics
- Oracle
- Cello
- Clover Systems
- Hegel
- Mark Levinson
- Madrigal Labs
- Harman International
- Polyfusion Audio
- Balanced Audio Technology

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