Had the great fortune of trying out the AK T1Ps a few hours ago. Tried them against the AK T5ps, normal T5ps, Audez'e LCD-XCs and Oppo PM-3s. Sources were a colorfly C4, AK 120 II and AK380.
Impressions for individual equipment:
AK 380: AK 380 is superb. Produces a jet black background and drives all the headphones with control and authority, yet ekes out amazing detail from every one of them. The price is insane for a portable media player but you do hear the difference between this and the colorfly c4 and ak 120 II. Really found that this player brought out the best in every headphone and didn't really pair badly with any of them.Would say soundwise, I'd rank the headphones in this order LCD-XC, T1P, AKT5p, T5p, PM-3
AK 120 II: They didn't have the more popular 240 in stock but the 120 II is supposed to sound exactly the same for non DSD music. Found this to be an extremely good sounding player too. Similar style to the AK 380 but just a touch less detail, smaller soundstage and a little less bass thump. Build quality still great. For some reason though, found this player didn't gel with the T1p though. Just sounded slightly thin and the bass was quite a bit worse than with the AK 380.
Colorfly C4: Such an old player but still IMO the most physically beautiful. UI is utter rubbish compared to the AK players but using that analogue volume attenuator almost makes up for it. Sound wise, surprisingly good. Would say it's a tiny bit worse than the 120 II overall but actually better for certain headphones. With the LCD-XC, the bass doesn't hit as deep compared to the AK 120 II. However, it definitely pairs better with the T1p and regular T5p than the 120 II. Much more musical and makes those two headphones an absolute blast to listen to. I'd say overall, the 120 II is slightly better technically (blacker background, slightly more 3D soundstage) but the C4 is a bit more musical and has the potential to still extract tons of detail.
LCD-XC: Best sound overall IMO. Not by a huge margin, but overall what I thought was best. Was good with all 3 players, had the most detail, great bass and just enjoyably smooth, liquid balance across the entire frequency range. No songs sounded bad from these headphones. however, I decided not to buy due to the insane weight which I found uncomfortable after 30 or so minutes of use.
AK T1p: Interesting headphones. I found them slightly less detailed than the regular T1 (2nd gen) from memory. However, still a superb headphone. Treble isn't hot but can be a little uneven on certain songs. Bass is solid if not great. Midrange and soundstage, very good and very musical with both the AK 380 and Colorfly C4. Something just didn't sound right with the 120 II though, bass was reduced and sounded sterile. Honestly loved this combo with the Colorfly C4 but still thinking about whether I'll regret buying a semi open headphone, they do allow quite a bit of sound to flow in and out
AK T5p: Super comfortable. More comfortable than the T1 imo due to the leather cups. (personal preference) Very good overall. Black background, detailed, fast, great soundstage for a closed headphone. Midrange fabulous though not as detailed as LCD-XC. Treble smoother than the regular T5p or T1p but still can sound hot on occasion with certain songs. Those songs stand our more I guess compared to the regular T5p. Female vocals on certain songs also sound a tad less energetic and realistic compared to T1P or T5P. Bass quantity slightly more than regular T5p and has nice thump. Best bass behind the LCD-XC.
Regular T5p: Great soundstage. (slightly airier and better than the AK T5P IMO) Black background, detailed, fast. Superb midrange and treble IMO, especially with the AK 380. Sounds hot on maybe 1 out of 10 songs but otherwise, outperforms the AK T5p or T1p IMO. For some reason, I just found these to sound slightly clearer but more importantly, more lively, airy and realistic than either of the AK models. I found the biggest gap with the AK 380 but even with the 120 II or Colorfly C4, I thought that these did better on vocals and most instruments. Arguably best midrange IMO, maybe even better than the LCD-XC.
Bass a notch or two too light. Fast, detailed and punchy but quantity lacking. Quite noticeable for certain songs, much less so for others.
Oppo PM-3: Read all about it and it doesn't disappoint. I'd say it was the worst headphone but it was really really close and has a super easy to like sound signature. More or less neutral with a touch of deep bass and high treble roll off. Slightly warm midrange. Frankly, for anyone looking for a closed back portable headphone for about 4-500, this is it. Superb for the price. Lacks that last bit of detail to challenge the rest but superb.
In conclusion, I'm now deciding between the Colorfly C4 or AK 120 II and planning to get a AK T1P(first choice) or regular T5P. Deciding on whether I'll need a closed back or can live with the semi-open. The surprise of the whole audition was the regular T5p. Really loved it's midrange presentation. Was also impressed by all 3 players and have to make a touch choice between the 120 II and C4 now