By the way, I expect that the Caylx M's warmer signature would tame the slight brightness in the hd700's signature and make great use of the hd700's masterful texturing for an awesome pairing.
Edited by Barra - Today at 9:25 am
I believe M sounds better with an external PSU. I was using 1A iphone power adapter (apple product) and it sounded quite... well very good. Compared to the battery sound, it gave a deeper sound stage and better definition. But a linear power should be better I thought. Recently from local used market, I've got a 5V linear power made by audio-gd, a variation of the class-A power supply for their usb interface. It sounds even better. Compared to the battery driven or switching power driven sound, F-range was extended, it gives yet deeper sound stage and treble became far more refined, silky and sweet. It sounds sweet, seductive, sexy, but it is by no way a sweet only monotone sound. You can tell Hilary Hahn's cold and reserved tone from Johanna Martzy's sweet and warm tone very easily. Yet the overall presentation became sweeter, pleasanter and sexier. I spent whole of the last night listening to almost only female vocals. IMO it will be worth to try a good linear external PSU for M.
Unfortunately, South Korean governmental regulation prohibits making/selling a linear PSU for consumer use. Ridiculous. Dr. Yi, D&A CEO, said they made a linear PSU for their 24/192 dac (also USB fed, so the PSU will work for M also) but they can't mass produce nor sell it! -_-; But searching for a better PSU might be considerable.
Is it possible the current flows out from the battery and flows into the battery at the same time? I think the battery has only a pair of terminals.
I was always curious about this. Somebody may have a definite answer to this, but I suspect that the source of power to charge the battery and output the power to the M's circuit would be the charger. For example, if you using navigation function on your big screen smartphone while your car is charging, it will not charge as fast, and I'm guessing that some of the power that power provided by the charger is also being used by the navigation function and the display so it will either charge slower than if you weren't using the device or not really charge at all if the the power that is used for navigation is more than what the power supply is supplying. If you use a 1A usb charger and use gps and navigation with screen on for a Galaxy S4, the battery will ether not charge or drain more. If it's draining, the circuit is using the PS's power and the battery's. If it's not charging that means, what the smartphone is using is what is being supplied by the PS. Thus I use 2A charger for my S while using GPS in my car.
So, I would think if what the M is using is lower than PS's supply power, it's using PS's power and charging the battery.
It's like this, a current is running through the line to a load(a battery to charge it), then all of a sudden another wire taps into it, making another load(circuit of the M), this means the PS's current is split, supplying both, the M and the battery.
I am doing well with a 1.6 A charger. I am also thinking that 2 A (e.g. iPad) charger might make sense.
I am not convinced that you can hear a sound difference though. It is still 5 volts and battery power is as clean as it gets. (A component like the Meier Stepdance / Quickstep amp that accepts higher voltages externally than the internal battery is a better candidate for sound quality improvements.)
I expected the battery would sound best so I was surprised when I realized actually the wall power sounds better. IMO with switching power, the sonic merits of wall power over battery are mainly rigidness of images and deeper sound stage, yet I don't feel degrading in background quietness or texture in trebles by a switching wall power. I feel the sonic merits are mainly related to the energy, so I think the merits mainly come from the ability to draw currents of wall power plus the internal filtering of power lines is quite well implemented in M. We now know that M is a quite battery eater. And improvement in sound color and texture by a linear power is quite reasonable I think. Of course the improvement by the wall power will depend on the quality of power lines. In my workplace where dozens of crap PCs an office running, I don't think the wall power sounds better.