Summary: So, I bought these during my birthday, though I first thought of buying the 688B and I thought the headphones were the size of a small pair.
But I was wrong. Instead of an HD668, I bought these. A really big pair of cans that you can't take out of a studio or a house.
Anyway, the first time I wore these, I already liked them. Though it takes some time to getting used to if you're used to small sized headphones or if you're not used to a sharp treble.
Pros: Not too expensive, Flat, nice build quality, good bass
Cons: The materials are cheap, sharp treble, these cans are huge, not very portable if you want to use it outside.
I've had these for about a week now, and I have to say I like them more each day.
At first I was rather worried about purchasing them, because other reviews were saying that the bass was slightly subdued and the mids/highs were more prominent; I personally prefer a warmer sound, so it was a bit of a gamble buying them.
Pros: Isolation, cables, replaceable pads, clear/detailed sound across full frequency spectrum
Cons: Clamping power, default pads result in sweaty head, some EQ necessary to fully bring sound to full potential
Summary: I've been using this can for a week now, and I can tell I'm really happy with it. I wanted to buy another model (Superlux HD-681 EVO) but it was unavailable in any retail shop in my country.
I'd prefer a semi-open build, because isolation could be a problem after prolonged use for me, but in the other hand it's great because you can listen music fairly high volumes without any sound leakage.
Summary: I received these when I ordered the 688b But still, I'm happy with them. Bass is somewhat subdued but still present. Highs and mids are very nice. I am listening to them now with a portable amp, tcg t-box, and they have benefitted from this. They draw me into the music.
Pros: Neutral, fast, wide and engaging
Cons: Earpads are not nice, you need to tweak the headpads
Excerpt: Так же долго выбирал недорогие с достойным звуком для вокала и музыки..Вбил в гугл недорогие качественные наушники и так же как ранее тут писали наткнулся на обзорчик http://www.3dnews.ru/multimedia/626539 и очень рад.Всем рекомендую.
Pros: Чистый звук на уровне более дорогих моделей,не жмут,отличное соотношение цена-качество.