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http://www.gsmarena.com/nokia_5800_xpressm...eview-308p6.phpExcerpt-"The phone flaunts an amazing frequency response keeping within the +-1db range effortlessly. Furthermore, for most of its range it is right on the perfect track. Noise level and dynamic range readings are also praiseworthy and so is THD. IMD and crosstalk are not as impressive but still quite good. All in all, you will be enjoying some of the industry best quality audio with Nokia 5800 XpressMusic."
Test Frequency response Noise level Dynamic range THD IMD + Noise Stereo crosstalk
Nokia 5800 XpressMusic +0.09, -0.77 -92.2 92.1 0.013 0.297 -75.0
Nokia N85 +0.28, -1.19 -94.4 95.4 0.305 0.701 -88.1
Nokia N96 +0.52, -2.14 -90.6 90.7 0.016 0.364 -73.5
HTC Touch HD +0.20, -2.29 -86.7 89.2 0.024 0.253 -86.1
HTC Touch Diamond +0.35, -1.12 -85.3 87.9 0.027 0.267 -86.3
Apple iPod Touch 2G +0.04, -0.05 -91.4 91.5 0.0027 0.012 -90.0
Apple iPhone 3G +0.52, -1.05 -89.9 90.1 0.0033 0.016 -93.1
Conclusion: The audio quality is excellent but still not at par with Apple iphone and Ipod products. My advise is if u already own a full fledged handphone, and an audiophile type of listener, get the ipod touch 2G.Technical tests are all well and good but sometimes things like audio quality is highly subjective to the individual listener, thus if the individual can't tell the difference between Apple products and the 5800, does this mean the 5800 is inferior? Anyways, I've listened to portable audio devices from walkmans, CDs to digital media like MP3s...my personal opinion is that when you're on the move quality is not that much an issue but when you are stationary then you'll find that even the best of portable devices lose out to a low mid-range hi-fi setup most times.