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I appreciate the help you people are giving me.
I read all those reviews from MalVeauX and I even asked him by PM and he advised me/preferes the HTF600. But I really don't know. I am affraid that if I buy the HTF600 they break soon and that if I buy the SR850 I'm affraid the bass will be low and not enough or the highs to overwhelming...
I'm in a dilema here
My HTF600's started breaking the week I got them. Tap them wrong? They break. Play a wrong note? They break. Tilt them wrong? They break. Fix the right side? The left side breaks. Forget to do a ritual dance to ward off evil spirits? They break even more. It's just inherent to their design. You can mess with them to fix things for a while, but unless you're one of the really lucky ones, it's probably going to be an ever-present issue that just gets worse over time. They're fun to listen to while they work, but I've honestly listened to them broken more often than I've listened to them in full working condition.
Unless you're a hardcore basshead (bass at all costs), you don't have anything to worry about regarding the SR850's bass: Not only is it good, but it's especially good for a semi-open headphone. The bass between mid-bass (thumps) all the way down to a 40Hz rumble is emphasized over the mids. It starts dropping off after 40Hz, but it's still present at 30Hz (the lowest frequency you'll usually be dealing with in music, movies, games, etc.).
You can check out a graph here, which compares the basshead Ultrasone HFI-580 with the Superlux HD 668B (same headphone as the SR850 except with a higher impedance):
http://www.headphone.com/learning-center/build-a-graph.php?graphID[0]=3301&graphID[1]=1973&graphID[2]=&graphID[3]=&graphType=0&buttonSelection=Compare+Headphones
It would be nice if we could directly compare the HTF600's graph, but Headroom hasn't made one for it (I'm not sure if anyone has). I suspect that the sub-bass below 40Hz would be significantly higher than the headphones I'm comparing here though. Anyway, note the logarithmic scale of the x-axis (frequency) and the way they mark certain frequencies with vertical lines: They mark 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, and 20000Hz with verticals.
The sharp dropoff to the left looks bad for both headphones (neither of which is the HTF600 of course), but if you look at the lines, you'll see that the bass is still stronger than the mids as low as 40Hz. I believe MalVeauX prefers to compare headphones based on their 30Hz emphasis though, which is where the SR850 weakens. It's still not bad at 30hz, but below that it drops to basically nothing. (Keep in mind that measured frequency response doesn't tell the whole story either: Based on the graph alone, the SR850 appears to have more emphasized mid-bass than the more expensive HFI-580, but the HFI-580 is still regarded as a better basshead model anyway due to its higher class of quality, speed, etc.)
The drawback of the bright/sharp highs shows in the spike at 8.5kHz and overshoot in the 500Hz square wave (Tyll's graph at InnerFidelity shows spikes in different areas, since it's compensated differently...I wish I knew which graphs corresponded most to a "flat line is neutral" reference point). It's not like "screeching harpies from Hades" though, and I personally prefer highs that are a bit bright over highs that are dim (like the HTF600's). I'm no treblehead, but I prefer a range of sound signatures between neutral and "U-shaped" over unbalanced downward slopes (too thick) or upward slopes (too thin).
As a side note, if you're sensitive to the SR850's highs, they'll be your limiting factor for sound volume. The HTF600 has a bit of a limiting factor too though, because it seems to have a spike in the upper mids/lower highs (around 2kHz or so IIRC) before it drops off. I'm a bit more sensitive to that than actual highs, so that's reflected in my preference.
Long story short, I'd prefer the SR850 over the HTF600 for most purposes anyway, but the reliability issue really seals the deal for me, because I'd rather spend my time enjoying my headphones instead of trying to fix them.