Even with the go100 I get a small amount of hiss with my 13's it doesn't get louder the higher the volume goes and you can't tell it is there while the music is playing unless it is completely silent. It is there howeve none the less. But the sound is as you said exceptional.
I must say I am thoroughly enjoying the GO100 with the new firmware and driver. Pure audio bliss with my JH13's fed directly from the GO. Pink Floyd never sounded so good! I HAVE BECOME COMFORTABLY NUMB!!!!!
Hats off to LH Labs
Portaphile 627 micro in mint condition and used for less than 1 charge. Decided to purchase the 627X. PayPal only, free shipping in the US. Willing to ship abroad at the purchasers expense. Buyer to pay PayPal fees. Photos available upon request.