Believe or not, I have tried tens of headphones in the last 13 years, burn-in does come with changes of sounding. How comes some changed dramatically, some didn't change so much? EQ also is tricky to change the factory balancing, just like it has worked in audiophile since 1960s.

I owned a pair of P7 as well, agreed that it is quite bassy when out from the box. However, as the process of burn-in going on, it sounds much balancing.

I totally agreed that DSD is just a container in a specific format, it isn't magic, it wouldn't improve the sound if just convert a format to DSD. The difference may be caused by some other factors like distortion, D/A characteristics etc.. Technology is basically the science. Sound differences...

Current oriented amplifiers are much suitable for matching with the low impedance headphones which draw lot of current.

Audiophile requires synergy in mind when choosing components. I have experience that a headphone sounds lifeless in one system, but turns out one of the best options in another system. We need to have sufficient knowledge on products, and how that synergy mechanism between different devices...

Totally agreed. In fact, there are other Japanese headphones sound better.

I use my SA-31 to drive both the HD650 and T1 very well. No worry about it.

Sorry I forgot to share the link http://www.ebay.com/sch/n7rk/m.html?item=261423699143&pt=Vintage_Electronics_R2&hash=item3cde1114c7&rt=nc&_trksid=p2047675.l2562

This man has a lot of NOS tubes. I bought several Rectifier Tubes from him from '40 Ken-Rad, '50 TungSol and RCA. .

Nope, I think. The E88CC improves the clarity and dynamic if using in Input (the single behind the volume pot). 6N1P sounds slightly musical but with less noise, which are selected by Steve Decware. Since its low noise, the 6N1P is recommended to be used in output (L&R) which these positions are...

Try to search the latest release Sony PHA-2, it is exactly what you require.

Looks clear that related to your PC, may be something wrong inside. If so, nobody can help until you fix the fault, or get a replacement. Sorry about this, pal.

Very easy to do some trouble shooting yourself. Swap another USB cable to see if the problem still exists - cable related issue Swap another USB port of your computer to see if related to a fault port Swap another computer (or laptop) to see if the motherboard issue

Would it related to the cable or your motherboard? You can contact Kingwa for assistance.

I really want to try it, as I'm also a big fan of SRH840.

One another option, M2Tech HiFace EVO

Make sure you don't connect the USB through a AC Powered USB Hub, use self-powered USB is fine enough. Having hum noise in USB is not common.

Looks like the grounding in computer not working well. I also agreed to check with Kingwa how to sort it out. Have you tried the USB with another computer? If it is laptop, better check if the problem still exist under AC power or battery power. You need to isolate the cause.

check the website, there is a link to inform all the customers the updated order status

This is also my concern. It may have difference and improvement (if not, nobody would mentioned it to M7), but if these changes worth another $1K. I doubt.

Agreed, even with the so-called "warm setting", the sound is only not that agressive but isn't warm at all. At least not the common concept what we think 'warm' in audiophile.

I don't think this is marketing BS... but I agreed that it related to personal preference. Why those audiophile big players use this PCM1704 in their products because it comes with very natural and dynamic sound. This type of sound is mostly favored by audiophile enthusiasts.   I remember...

I saw some in TaoBao of China. It is very easy to find but all the pages in Chinese.

  Master series is far superior than the NFB series, which even the Reference series cannot match.

  Basically the pre-amp section is identical with the design in Corda Symphony.2.