I'll give it a shot.  It's odd that a third party player would work while their partner's doesn't.

Documentation for new firmware mentions fixes for Android devices not detecting the DAC - however even with v1.20 my HTC M8 running Marshmallow is not detecting P90SD in Onkyo HF Player.

  DAC is very different as well, and while 5102A in HA-P50 is also a BurrBrown (with quite similar signature), it is an audible step down from newer 1795 in P90.

I tried mine through Wyrd and iFi iUSB, with either device DACportHD shows an improvement.  However, it is more pronounced with Wyrd, which seems to indicate that either my USB source quality is not up to par (which is likely, as I am using a rather dated laptop), or this DAC's USB chipset is...

I'm using a big Slappa case ​(SL-HP-07), seems to fit well.

Album and Artist names need to be perfect - the alternative is to create playlists for every album and navigate that way.

No, the UI has not changed at all, and I doubt that it will - the capabilities of built-in processor are quite limited.  After all, this is a DAC/amp first, and a player second.

​ Are you looking for microUSB OTG cable to connect it to a smartphone? then this could work for you, assuming your phone provides enough power over USB

1 - no, controls do not work when the device is connected as a "slave" to an Android. 2 - no, there is no L-R balance control on P90SD.   Between P90SD and X5mkII, technical differences are not very significant, DAC and output stages are quite comparable, and even the sound signature will...

Since both Slim and HD are Class A amplifiers, power consumption will be constant, regardless of the actual load of the headphones.  So expect 450mW + DAC (about 170-190mW) for Slim, and 775mW + DAC (almost 1W total) for the HD version.   Requirements for AK4490 DAC might be lower or a bit...

I have a DACport HD, and even when used with a laptop (Surface Pro) extra load on the battery is quite noticeable.

In general, Class A amps and portable use are not a good match. DACport gets very warm, regardless of the amount of power actually required by the headphones - so you will be using your phone's battery to heat the space around you.

The chip in DACport HD is Asahi Kasei AK4490.  The same DAC chip is utilized on the new Schiit Bitfrost, recently released TEAC UD-503 and Astell & Kern AK380 - among many others.   I was able to play back DSD 5.6 files with no conversion (except DoP encapsulation) from PC - but that appears...

 Yes, this device supports direct decoding of DSD stream up to DSD128.  The DAC chip itself does support even higher rate, and has a direct bypass capability for DSD stream - however, the current limit of DSD128 may be due to maximum bitrate of 384k / 32 bit in PCM mode, which is used to deliver...

I am quite certain that Snorry would gladly work with you on mods to LCD's. He has quite a following in Moscow, and the only drawback is his high expectations for quality of workmanship and precision machining of components and parts.

I own a DACport HD, perhaps Slim is different

I have not seen any significant change yet.  The brightness is definitely there, but overall response becomes a bit more balanced when it is connected through a powered USB source (Wyrd in my case).

Sounds like someone else was trying to mod the LCD.   The damaged set described in the other thread is still with the guy in Moscow.  Maybe you could help him out - he's been looking for a driver or a pair. :)

It's definitely on the "kind of cheap" side.  But it's hard to expect something different in such a small, low cost device.

  This would certainly be true for an inexperienced modder.  However, in this case, the individual happens to have an extensive experience with various planar headphones - Denon, Fostex.  He also completed a mod on another LCD-3, which showed improvements after the mod.

I'm not debating whether a particular test head may produce different measurements at EEP.  However, a significantly less advanced tests appear to capture differences in frequency response of LCD headphones​' right and left channels, which get subsequently resolved by matching physical...

This is valid in the context of psychoacoustics, however, it does not explain the reason why such variance in frequency response exists between left and right channels of these headphones, particularly since most of it can be attributed to the shape and density of the pads.

Absolutely, that is where all other elements of the assembly, including the earpads and their fill density, get factored in.  So in the example above, where the earpads are either uneven in their thickness or fill density (both of which are quite frequent in LCD series), there is a...

And with these final measurements, are the Left / Right channel results averaged as well?

At the time when the drivers are matched using IEC Baffle, is the fazor element already installed, or does that get glued on later?   Are the final measurements made using a fully-assembled unit, with pads?