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Test files of iPhone 4 were replaced

Test files of iPhone 4 were replaced

Starting from July 2015 testing scheme for digital audio players was modified. Instead of Koss Porta Pro headphones the plain resistive load of 33 Ohm is used now. Also accuracy of the test file processing for analog circuits was improved substantially. Unfortunately resulting new ratings of DAPs are not compatible with the old ones, so the latter were removed. Sorry.

New info, if any, about iPhone 4 will be posted above this disclaimer. Previous article about iPhone4 along with the results of its listening test is under this disclaimer for archival purposes.
iPhone 4 smartphone by Apple

iPhone 4/4S
smartphone by Apple


Extensive research experiments with Galaxy S revealed that accuracy of test files preparaton for analog audio devices must be higher than we used for iPhone 4. As a result comparison of players could be unfair. We decided to prepare test files for iPhone 4 from scratch using our latest recordings of white model with iOS 4.3.5. Unfortunately there is no possibility to account the grades submitted with old test files. They were discarded, sorry!

New test files are alredy in the system. Article about iPhone 4 was corrected accordingly.

Best regards,
SE Team.


Update. 2015 August 22

Deprecated results of previous listening test of Portable Players. For archival purposes only.

Deprecated results of listening tests of portable players

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SoundExpert - How it works SoundExpert (SE) is a crowdtesting service that provides audio quality ratings of sound equipment and technologies such as mp3, aac, wma ... encoders, portable players, sound cards, amplifiers ...

The ratings are based solely on results of blind listening tests when listeners don't know the particular device they test. So the values are completely unbiased and free from any marketing and advertising noise.

SoundExpert provides ratings thanks to visitors who take part in testing. The more number of participants - the more devices and technologies could be tested. The ratings are computed in real time while new grades are returned by visitors. The testing procedure is simple and short enough that anyone, including you, can participate. Just download a test file (<3Mb), listen it (<15s) and send back your judgment. Details are in test file. The more accurate grades - the more reliable ratings.

SoundExpert is independent non-commercial research project. It's in beta state because it uses new audio metrics and corresponding listening test design which are not widely adopted by audio engineers. The key feature of this new method is possibility to hear sound artifacts which are normally beyond threshold of human perception. So, please, use these ratings with caution. Detailed but still easy to understand explanation of SE internal mechanics is in the article "SoundExpert - How it works".

The main idea behind this service is consumer control over sound quality measurements of various audio equipment on the market. SE, being a distributed human project, combines tiny efforts of audio enthusiasts for carrying out this task.