In order to give the reader more objective information of the pure audio quality of a sound card some advanced writers and websites try to compare sound cards at least in the same conditions on one computer using special measuring programs. Such programs are either completely commercial products or shareware and freeware. The source code of all tests, at the same time, is closed for others. Without the source code we can sometimes wonder whether a test provides better results on the equipment of the definite manufacturer or just wrong results. If the test results or principles of operation of this test evoke questions, independent experts can't ascertain how the test works and why it gives such results.

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So, it is necessary to create a test, the results of which can be easily checked or which can be repeated by independent experts without even special-purpose expensive equipment. The test is also necessary for manufacturers of high-quality equipment. First of all, to show comparative advantages of their products which are equipped with high-quality gear details. Secondly, to furtherstimulate development of even greater quality in the industry and to make the competitors to use only fair methods for illustrating theirfoothold of better quality in the market. Furthermore, trustworthiness and accuracy of the test must be easy to verify.