Can someone please compare the sines to the B&O h6 2nd gen?
I do not own the H6, but can point out a few things:
H6 comes with ipod only cable, so you need another cable .
H6 has been said to have flat lean sound need amping to sound best, and not efficient, which is strange.
H6 uses a 40mm dynamic driver.
Dynamic drivers are usually very efficient, so dominant in portable use,
But will always produce a non liner dispersion/wave pattern to ear due to shape of driver...
So most portables are just not going to get past those limitations.
In contrast Sine The Sine’s 80 x 70mm flat planar drivers claim to be three times the surface area of any other on-ear in its class..
This is most probably a comparison to a dynamic driver though.
A Planar headphone creates a huge even/accurate sonic "wave front" pattern to your ear.
This equals a more realistic wave pattern than any dynamic driver,
and is why most planers will sound superior to a dynamic driver.
The HD800 solves this by creating a ring radiator , which is a dynamic driver without the center dome..
So if you really want to compare the Sine sound quality to a similar quality headphones,
You have to look at the top of line portables.
IMO, the Sine is in same top class as the Ultrasone ED5, the OPPO PM1&2, and the HifiMan Edition S,
All of which I have owned.
The sine is currently my favorite portable,
But ONLY with the pad change to over ear..