Excellent IEMs

Overall a very solid headphone.  Can be used unamped, which may be a deciding factor for some.  HeadRoom got it right when it described a little "grain" in the presentation, but this headphone doesn't have many other faults.  At the same time, it doesn't have much to distinguish it from the increasingly good competitors.  If you are short on amps and want the Senn sound, then this is a solid choice.  Otherwise, go for the 600 or 650.

Headphones simply do not get better than this.  The first time I heard the O2 mk1 was at the First National Meet.  I was blown away.  I had no idea that headphones could sound like...that.  They simply melted away.  It some ways, they ruined that meet for me because they were among the first phones I heard.   Fast forward a few years and a few meets later and I decided that I had committed to enough money to mediocrity, and I finally pulled the trigger on a pair on the used market.  Amped with a KGSS DX, they are a splendid mixture of power and...

The JH13 is not just the best IEM around, it's one of the best headphones around--period.  The impact, detail, speed, agility, and body of these phones are simply amazing.  The full-sized can I find myself comparing them to is my O2 mk1.  That's about the highest praise I can offer a headphone.  Jerry Harvey does not screw around.  The only cons are that it may take a couple of refits to get them dialed in (but this is worth it) and I sometime wish they had just a touch (and I mean a tiny bit) more bass.  But even that criticism seems to be waning as...

A pair of headphones I wish I kept.  Great bass, excellent highs with the right equipment.  Scales with the best of equipment.  Everyone should own a pair at least once.  

LISTENED AT MANY MEETS   I never did get it about these phones.  I think they sound tinny and boring.  The only time I have ever heard them sound somewhat decent has been out of the big HeadRoom amps.  There's something to that combo.  Otherwise a real snore.

BORROWED FROM A FELLOW MEMBER   Wow, did I want to love these headphones.  And I just don't.  They're fine.  They don't do anything horribly wrong.  But the also don't do anything extraordinary, and for the price being charged, they should.  I think the HD800 is better.  However, it is a very comfortable phone and the build quality is superb.  Just a bit blah to me.

An expensive, technically proficient headphone that has no soul.  Does mate well with the Luxman P-1 or P1-u, but at that point, why not go electrostatic, which is what these are trying to be in the first place.  Kudos to Senn for innovation, but these are just too steely for my tastes.

A bass lover's phone for sure.  Can be fun with the right music.  But the bass is of the one-note "whump" variety and that gets boring.  Still, can be good with rock.  I've noticed some pretty sucked out mids, though, so vocals suffer.  And for a bass-head phone, the highs can get pretty brittle.  Not at all a balanced presentation, but that doesn't mean it can't be fun.  Everyone should give these a try.  And they're built like a tank.

DISCLOSURE: I received a loaner D100 as part of the Neko Audio D100 loaner program.  Wes Miaw, the man behind Neko Audio put together the loaner program.  All outgoing shipping was at my expense.  The loan was not contingent upon a positive review.  However, Mr. Miaw did ask if I would post my impressions (good or bad).   The D100 is an unassuming DAC.  A black box with a silver knob input selector in the middle and the ubiquitous blue lights for power and signal lock.  The unit is small and unobtrusive, and while it isn't high fashion, it is...