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Originally Posted by
Argyris 
That KPH-7 definitely doesn't measure that poorly for what it is.
They don't sound half bad either.

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I imagine it's probably better than most of the pack-in type headphones that used to come with PCDPs. I wonder if they even bother with those headphones anymore, as the style seems to be for iBud-like things these days.
They are. And I have no idea if they still pack such headphones in with portables, but these would be the Rolls-Royce of those kinds of headphones imho (which isn't saying much, but you get the idea).
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For that matter, do they even sell PCDPs in big box stores anymore? It's been many years since I bought one, so I would have no reason to even check.
I heard about such recently, yes. Haven't looked myself - but I'm assuming yes, since they sell PCDPs and I still see people out on the street using them from time to time (they aren't very common, but every now and then I'll see someone on the train or tram with one, and remember the 90s).
My only gripe with the PCDP is that only a few of the early models had rechargeable batteries, and then everything went to blasted AAs.

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Also, come to think of it, I did use headphones on a plane once. It was actually a weird setup from what I remember. It wasn't electric. Well, on some level it had to be, but they would give you the 'phones and you plugged this rubber tube (like a stethoscope) into a hole on the armrest, and it would channel sound into your ears from (presumably) a dynamic driver sealed in a chamber. There may have been passive drivers in the earcups. Of course I was way too young to think to check for any of this, but even then I must have been mystified by how it worked because I remember all these details now.
Pneumatic headphones. They're among the worst sounding thing ever created.
http://en.wikipedia.org/wiki/Speaking_tube
They aren't common on modern airliners in my understanding (the last few times I've flown it's all been dynamic jacks in the armrest), being replaced by *VERY* bad dynamic headphones (that you pay a fortune for), which are usually wired in mono. Better to bring your own cans methinks (not that I've ever really had a desire to listen to the aircraft audio signals - I bring my own PDP as well).