I decided to make this research after I tested the sound quality of my newly purchased Samsung Yepp T5X it was almost unbearable. If you find this research is of use to you, then you may use it for your own research
Note: Initially the review was based on the experience with one particular YP-T5X model, but when I saw the exact same result testing the YP-55 player, I decide to address the issue on all Samsung flash-based players. If you find any of my research is incorrect, I would appreciate any input that you feel would be beneficial, in order to rectify errors which may be shown
Table of contents
Having seend the Samsung Yepp YP-T5 (T5V, T5H,
T5X), I was impressed by the size and features on the unit the body
volume being only twice that of the EMP-Z. Having the body volume
just twice of the EMP-Z, and powered by one AAA cell and sported all
the modern features of flash-based portable players, such as FM-Tuner,
direct MP3 recordings, voice recorder and so on. There was no doubt I
would buy it.
Before purchasing my last test being the most important, sound. The
maximum volume was not impressive but EMP-Z had similar. The sound was
a little strange, lacking in highs. Anyway, this didn't stop me going
ahead and buying it. I assumed there would be something in the settting
which would allow some adjustments on custom settings.
However swithching to 'Normal equalizer' mode did not solve the problem. I needed something more concrete with confimrations from 'real measurements', rather than allow the matter to stay "as is". The problems appeared to lie in the highter frequences having a lower level than mid and low. I should add that I'm talking about my personal feelings based on previous experience using the same headphones with my new unit.
After some thought my chosen methods of research, which are by no means unique, but will give other customers like myself with few technical skills, a advantage.
is a special testing tone, often used for audio equipment testing,
sweep sometimes found on the testing discs bundled with
This is special wave of sound which gradually changes frequency from
value to another. Generally the tone from 20 Hz to 20 kHz is being used
since this bandwidth is considered virtually audiable by the human ear.
When this test is used for acoustic devices, such as acoustic systems
or headphones, it allows you to compare what the frequences the device
produces and just how well it does it. Because of different hearing
conditions and the different hearing abilities of an individual, this
technique is probably not the best for an objective analysis.
I would appreciate your comments should your findings differ from mine (email@example.com).
Sharp MD-MS701H Very good results, the amplitude value �3.05 �� stayed almost the same through the whole fragment. The deviation value is about -0.02 + 0.002 dB
EMP-Z. There is a little gradual
from lows to highs, but this increase measuered in 0 to 0.06 dB, I'd
considered it a good result
|Sony MDS-JE510. The only non-portable hero here. Moreover, it is a Analog-to-digital stations for all other tests, so when I decided to measure its values, the Sharp unit became a soundcard. Headphones output was chosen for getting the wave. The deviation is very small too.|
|Samsung Yepp YP-T5. The main result. Take a look at the shape on the right, can you call it a rectangle? I guess you could. You can see it is exaggerated in the mid frequency and what is interesting, the shape is a very natural outline, not random at all. The difference between the amplitude values at the maximum and minimum points is nearly 1.65 dB. Is it a large or small difference? If your look at the same artice at pcavtech.com, you'll see that the authors considered 1 dB as sometimes a noticable change.|
What of the other
equalizer items in the Sound menu. May they
be used to make the sound more straight? Unfortunaetly the answers is
a resounding NO. Look at the shapes in the diagrams below. They show
the measured shape for every
item I mentioned before (Normal,
Neither allows you to make the 'high
frequences' higher or even the same as middle. The so called 'user
preset' has 'Treble' parameter inside, but affects only 'mid
frequencies'. Settting Low and Treble to zero will not produce higher
RightMark Audio Analyzer v.5.2 test. Testing chain: External loopback (line-out - line-in). Sampling mode: 16-bit, 44 kHz Summary
|Test||Sharp MD-MS701||BeatSounds EMP-Z||Samsung Yepp T5X|
|Frequency response (from 40 Hz to 15 kHz), dB:||+0.61, -0.49||+0.33, -0.32||+1.32, -0.78|
|Noise level, dB (A):||-91.9||-93.6||-91.7|
|Dynamic range, dB (A):||91.4||85.5||89.0|
|Stereo crosstalk, dB:||-79.2||-91.9||-91.1|
As you may see, RMAA shows a little less values for the frequence response, 1.32 dB. (mine was 1.65), but anyway this result is much worse than those of other players. Just look at the blue line at the image above!
Some people acutally don't know what the
means. There are many sites which show "Frequency response
20-20000 Hz", but in this case they had to call it 'Frequency
bandwidth'. If you
look at the same article
pcavtech, the point is that "Frequency response is
specified by the combination of three or four numbers".
You will not find other two values for Samsung YP-T5, YP-T5V, YP-T5H,
YP-T5X, YP-55 anywhere at their website. And I suppose that Samsung
provide us with the information.
Please let me know if you found this article useful, additionally I will be glad to get any comments on this article (firstname.lastname@example.org).
There is also a russian version of this article. I have advised the local representatives of Samsung about this issue and they have said that they 'might' contact the engineers, but I have had no other comments from them at this time. I hope that this article will be read by someone from the Samsung who will take steps to change something in the firmware so the player will have a decent sound and this will be benefitical to the individual and to the reputation of their firm. If Samsung do respond to my observations, I will add their comments to this page and any references to downloadable files or documentation they deem suitable.
I also would like to give my credits to the Beatsounds EMP-Z player. Not only still the 'smallest in the world', but also one having the very respectable sound, good job, Beatsounds! By the way, I have noted many rebranded version of their unit, including Virgin label this facts speak for themselves...
If you want to make a similar test with your player, you can use the same tone, I used. To download a 180k file, click here. It would be great, if you share your results with me, so I may add a new test data to this page (email@example.com)