I just picked up a set of the PM-1 headphones a couple of days ago.
These are my opinions thus far. Feel free to agree or disagree! This is more of a first impression than anything. I am really pleased with the purchase and grow more so as I spend time with them.
Sources: various sites and media across my PC utilizing an HRT microStreamer
as well as some time with my OPPO BD-105
I was a bit dissapointed with the BD-105 headphone amp. A bit dull and lifeless versus the HRT.
In that I haven't spent much time with recent high end cans, I will have to compare these to my Wilson Watt Puppies. Sorry for that!
Micro-details are clear and precise
Versus the W/P - they lack the base punch - this may be the fault of the lack of a real amplifier.
Very easy to listen to for hours on end with no fatigue whatsoever. I keep wanting to hear just one more cut.
I preferred the sound and comfort of the velour pads over that of the lambskin set. Not by very much though. Both are viable options and I will probably spend more time investigating this in the near future.
Once the holiday mess has settled I expect I will purchase an HA-1 and a balanced cable. I expect that this will really be a boon to such a pleasurable headset. More to come as I get more time on them and decent amplification.
I do want to stress that the HRT really does shine with these if you are in the market for an affordable/portable USB DAC amp device.