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AKG K420 is the least expensive one among the , K420,K430,K450, the portable phones that are newly released by AKG. However, its quality should not be underestimated. I am not much fond of its appearence, and I agree if you say it looks cheap. As a portable headphone, it is made to be very light so you don't feel much pressure when wearing it. The noise-isolation is not satisfying because of its semi-open design, but leads to a bigger soundstage. About its sound quality, I had the opportunity to compare it with Px100, and I have to say I prefer this one better, though they sound similar. Bass sounds similar both in temrs of quality and amount on both phones, and voices are more emphasized on K420 when it comes to the mids. Also, the K420 has a better extension of the highs which leads to a more transparent sound than Px100. However, if you listen to classical music, I suggest you go for Px100, though I doubt wheter there will be anyone listening to classical on portable devices.
These are a pair of low- price range headphones promised to give a 'surprising' sound quality. This is quite a claim, so I decided to test them out. Sound Quality: As with all speakers, I tested them over five tracks of varying audio: classical, spoken word, pop, metal and electronic- these provide a good range of pitch types and dynamic changes. Was I surprised? No. Sadly, the promised quality was not surprising in any way whatsoever. By that I do mean that they were not bad quality, neither were they impressive at all. Very average. The classical track was very weak in the bass area and the spoken word didn't give any treble- so words became too soft. It wasn't enjoyable listening through these phones. The design is good, however, the headphones fit comfortably on top of your ears without pressing on them, which is a good asset. The cord length is 1.2 metres which is long enough for most situations and they work on a 3.5 mm jack. Overall, there is nothing special about these headphones, just very average.
The semi-open K 420 mini headphones feature ultralinear sound. The proprietary AKG headband with cushioning collapses along a three-dimensional axis to fit into an easily stowable carrying pouch. And unfolded? It gives you captivating wide-spectrum sound that's free of distortion, even at high listening levels.