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YUIN PK2 - a review

post #1 of 80
Thread Starter 
Received the PK2 last week, burned them in and have been listening to them in a variety of environments – amped and unamped, from a DAP and CD player, for extended sessions on their own and in A/B sessions with an AT CM 7 and an AT CM5.

I entered the head-direct contest for this pair partially because I was interested in purchasing a pair of these but hadn't seen enough reviews to make a selection. I think some more sentiments have bubbled out since then but these are very interesting ear buds and I had promised to write a review if I received them - so here we go.

First, and let's be frank, I won these – thanks to the generosity and smart marketing from head-direct and that means I'm probably biased towards them (doesn't the piece of candy you swipe from your neighbor at work always taste better than they piece you buy yourself?). But I am trying to be objective when I say that these are one very fine pair of headphones, especially un-amped from a DAP.

First, why would anyone drop serious money on ear buds? Isn't that the domain for gilded IEMs where isolation allows connoisseurs to appreciate the subtle nuances of hi-fidelity? At least with IEMs, a section of the public appears ready to plop down full-size cash on little listening devices. So why not with buds? If you follow the threads here carefully, particularly the portable audio forums, your ears are probably still ringing from a resounding chorus of people clamoring for a descent ear bud. About every other day someone asks: “Hey, is there a descent sounding bud out there?” Typical responses include: a) try an IEM; b) the senn is a good cheap bud; c) AT makes a pretty bud, supposed to be good too; d) why do you want a bud anyway?

Let me tackle that last one. I use buds a lot. In an office I have to be able to hear a colleague. At night it's helpful (sometimes) to hear a spouse when she's trying to talk to you. During the day it's helpful to here approaching cars as you're about to step off a corner onto the street. Basically it's nice to be able to rapidly insert and remove a bud. I also find them much more comfortable than any IEM I've ever tried.

So why spend so “much” money on an ear bud? Well that's relative. Let's say most of your listening time is spend with a bud (about 80 of my listening time is in the office). Maybe allocating some funds for a pair of buds you'll use every day isn't such a bad idea, especially if you just dropped some real money on a new DAP. Maybe a good set of buds could compete (not win but compete) dollar-for-dollar with full size cans. Maybe you want more head stage than most IEMs. Again, both the PK 1 and 2 are less cash than most good IEMs

Okay – there's a market segment. But can the PK2 fill it? How does it sound? In a word, “musical.” Okay another word: “fun.”

Tone and timbre is where this little bud excels. Let me give an example. Sitting at a desk listening to the conclusion of a Bach piece, the audience claps. I sat up and looked around assuming someone had done a presentation in the office somewhere and I was hearing the clapping echo. Same sort of thing occasionally happens with my Beyer 880 – but this is a little bud!

It does, however, have some weaknesses – nothing is perfect. Treble is smooth but not as detailed as it could. Bass doesn't have a terrible amount of impact either. Lower treble and upper bass is thick and luscious but also slightly overemphasized, making some singers sound “real” and “present” but slightly “fat” and “buttery.”

Let's do some compare and contrast with the AT buds. The AT CM7. People of comment on the build quality of the ATs very positively. I prefer the PK2. Yes, it looks like inexpensive, but it doesn't draw attention. And those metal pieces on the CM7 are connected with thin little wires, which concern me more. The PK2 is a j-cord, which is a huge mistake for the American market – do a poll on head-fi and see how those results turn out. The PK2 has a nice presentation - comparable to the CM7 – a solid gray box, and little film canister –container, both are certainly more usable than the CM7 “wallet." The PK2 also has a reasonable cable length whereas the CM7 has a cord that's too short for anything but an arm band and an extension cord that is a little too cumbersome (remember, buds are supposed to be easy and portable).

Straight from a PCDP or DAP the PK2 clearly has the better midrange, is smoother and is far more musical. The CM7 has more bass and better resolution. For example, with string pieces you can hear secondary harmonics with the CM7 hardly present with the PK2. The CM7, however, is fatiguing whereas the PK2 is anything but. That's crucial for long listening sessions (like at the office).

At this point I'd say it's a matter of preference. The only thing is the PK2 is half the price of the CM7. The PK2 scales just as nicely as the CM7 when amped (at least with a Pimeta). Makes me wonder what the PK1 could do. Or maybe an Ety 75 ohm adapter cable with the PK2 could give you the best of both worlds.

When comparing the PK2 to an ear bud in its price range like the AT CM5 (no longer made), the PK2 simply destroys it in every phase, making the CM5 sound like a tin can.

Okay – what about compared to a perennial favorite around here: the Koss KSC? My take – the PK2 wins. Less bass but more refined. Smother midrange and more balance – but overall still a fun phone. More portable too.

The best way to think of the PK2 is as a Fostex speaker (Cain and Cain, Omega, etc.). It's fun and musical and sounds realistic. No, it won't do crazy bass, and no it won't hit the highest treble or give the most detail in complex passages, particularly orchestral. But it sounds “right” and makes music sound like music and you can listen to it all day long. And you won't get odd looks or get run over by a car when wearing them.
post #2 of 80
Nice review!
Don't you want to try the PK1 now
post #3 of 80
Thread Starter 
thanks - yah it is seriously making me consider the PK1. I do wonder what a 75 Ohm adapter with the PK2 would sound like. I do have one coming so maybe I'll have to report back.
post #4 of 80
Quote:
Originally Posted by jrosenth View Post
thanks - yah it is seriously making me consider the PK1. I do wonder what a 75 Ohm adapter with the PK2 would sound like. I do have one coming so maybe I'll have to report back.
Any news on your adapter and whether it worked? I'm interested in the PK2.
post #5 of 80
You know I was going to do a review on the PK2 too, but this about covers it. Right now, PK2 plus portable source minus external amp equals the best non-IEM alternative out there. The KSC75 and K81DJ bring other factors to the table (clips, closed cans) and have different signatures, but the PK2 is right in the mix, and according to your preference, will be the choice over those. Plus, you can tuck em under a hat and no worries - pop them in and out in no time. The ONLY reason my wife doesn't steal them for her work commute is because her AT-CM3s are prettier - but I've listened to them, total tin cans. PK2 - not long on looks, but fits a niche very well.
post #6 of 80
Nice review! I agree with your findings. There are things the PK2 can do that the KSC75 can not, that IMHO puts them reasonably close to each other. Although the PK2 beats the KSC75 in terms of detail resolution and refinement.
post #7 of 80
now that review made my discision even tougher. vibes or pk2?
post #8 of 80
Quote:
Originally Posted by _M2 View Post
now that review made my discision even tougher. vibes or pk2?
that's an easy one for me. Vibes stick into your ear - can't stand that! gotta go buds or clips or cans here.
post #9 of 80
haha ok i should say in terms of SQ?
post #10 of 80
I listen to my PK2's mainly at work, amped by a Go-Vibe V5 (the limited edition with AD8397/AD825 - soon to be released as the V6 with some additions) and, with this amp and a modest source (Creative MP3+ USB Soundcard), but a non-modest IC (Grover S), the PK2's give me MUCH of the listening pleasure of my SR225's PLUS MUCH of the listening pleasure of my EtyER4S. They give more bass (and more crunch/chunk for Rock) than the ER4S, AND they give more of that gorgeous upper range detail beauty of the ER4S than the SR225 do. Since I got the PK2's, my ER4S (except for some A/B comparisons) have been sitting in my desk drawer. I can recommend the PK2's with this amp as a main can for all genres of music with really enjoyable coverage of them all - a really nice quality all-arounder. And that's amazing at $69 shipped for the PK2 + $90-ish shipped for the upcoming Go-Vibe V6. If the PK2 and the GV V6 had only been available when I started getting serious about headphone audio about three and a half years ago, I could have saved myself a LOT of $$$ and been a lot further ahead faster. These are GREAT days to be delving into headphone audio!!!
post #11 of 80
So I have a Go-Vibe on the way, and then Head-Direct put the PK2 ON SALE for $49.00 Shipped! I had e-mailed fang and then he posted this:

http://www.head-fi.org/forums/showthread.php?t=224711

So now I have PK2's on the way too. I'm very excited.
post #12 of 80
Amazing price.

PK2 to PK1 isn't a day and night difference is it?
post #13 of 80
Quote:
Originally Posted by kite7 View Post
Amazing price.

PK2 to PK1 isn't a day and night difference is it?
the answer to that is yes, they are totally different beasts. for instance, put a PK2 in an ipod, bingo no prob. put a PK1 in there? wtf. on the other hand, hook a Hornet up to both, and the PK2 is like "a bit rich for my blood, no?" while the PK1 is like "uh, put me on high gain please. ah, thanks. ok...HERE WE GO!" and the PK1 dances rings around the PK2. better high and low extension and definition, just sounds more real to me. less like a commerical/portable solution and more like a Home Can believe it or not. But then, the price diff is very significant and they both look like OEM buds, oh well.
post #14 of 80
Quote:
Originally Posted by 1badmf View Post
... Head-Direct put the PK2 ON SALE for $49.00 Shipped!...
When I saw this sale price, my fingers RAN (not walked) to PayPal to order a 2nd set of these AMAZING phones. I'll likely end up ordering a 3rd set before I'm done. (One of my kids has a real treat in store the next time they come to me to borrow a "set of buds".)
post #15 of 80
Quote:
Originally Posted by Jahn View Post
the answer to that is yes, they are totally different beasts. for instance, put a PK2 in an ipod, bingo no prob. put a PK1 in there? wtf. on the other hand, hook a Hornet up to both, and the PK2 is like "a bit rich for my blood, no?" while the PK1 is like "uh, put me on high gain please. ah, thanks. ok...HERE WE GO!" and the PK1 dances rings around the PK2. better high and low extension and definition, just sounds more real to me. less like a commerical/portable solution and more like a Home Can believe it or not. But then, the price diff is very significant and they both look like OEM buds, oh well.
Can't...resist....pk1....why did I have to peek into the headphone forum?

Great review though, jrosenth! I could hear them myself from your description!
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