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I don't own the Q701/K701 (even though the K701 was the headphone that got me interested into this hobby :p ) so I might not be too helpful on that part (you should be able to find a few options if you google a bit). I do use the HE-400's, K550, and DT880-600 ohm with the H10 (with the HE-400 being my main pair).
In the H10 there are two sets of op-amps (two dual in the rear near the inputs and two singles on the opposite side of the transformers) you can change them ("roll" them, which is just swapping them to tailor the sound to your preference) to alter the sound a bit more (not to say the stock op-amps are bad, since they are great). As mentioned previously I have a set dual/single op-amps coming my way to test out how drastic the change is/may be (I am pretty curious though).
While the H10 has a balanced input, it does not have a balanced output. On the back of the H10 there are two input options XLR (which are balanced) and the RCA(which are unbalanced).
Where can I buy these op-amps? It feels like they are some sort of raw-materials and may not be obtainable from amazon etc.
Besides, new power cord has arrived and it works well.
Wow thanks! I'll definitely try some op-amps mentioned. There is so much to learn before picking op-amps... I need to recall what I learned in high school to understand those specifications haha