Thanks, I will have further look into it

Well, are there any other advices?

Yes, you are right it's never a easy task, I will keep looking for whether there is a second-hand Audiovalve RKV MK2 or not, but even if I found one currently I can not afford it.   Again sincerely thanks for you help, have a nice day~~ 

Thanks，but DIY is a little bit hard for me, plus I don't  think I can get all these stuff easy in Germany

Quote: Well seems something wrong for my profile functions ( I can't find any place to edit my information except for my photo）, but never mind.   Yes, I do tried other headphones such as DT 880 , HD650, ATH-ESW9, and in a fun club I have the honor to try the lengend AKG K1000 and...

Well, actually I do not need the amp to have a DAC function, and I'd like to choose a DAC with a optical input. Thus compare with WA7's 999 dollar, I'd like to find some decent AMP with RCA input and around the price 600 euro (or 700 dollar).

Quote:   Well, I think this is the reason why there is not a conclusion on which amp is better for K701, and by the way how to set the Current using:, and Had:?  I am just new here

Dear all,   Sorry for posting the same question which appeared hundred times, currently I have a integrated DAC AUNE X1, it do have a Amp itself. But for K701 it's obviously insufficient, I use a Macbook pro + Amarra to output optical digital signal to the AUNE X1, it do performance good at...

Thanks for your advice, I have searched for it, about 650 euro on ebay.de, but I heard from different viewers that K701 performance better on Class A tube amp. And AMB M3 is a DIY product, I wonder where I can find a chance to try it here......

Dear all,   Sorry for posting the same question which appeared hundred times, currently I have a integrated DAC AUNE X1, it do have a Amp itself. But for K701 it's obviously insufficient, I use a Macbook pro + Amarra to output optical digital signal to the AUNE X1, it do performance good at...

Dear all,   Sorry for posting the same question which appeared hundred times, currently I have a integrated DAC AUNE X1, it do have a Amp itself. But for K701 it's obviously insufficient, I use a Macbook pro + Amarra to output optical digital signal to the AUNE X1, it do performance good at...