I just wanted to add this tidbit about volume control on outside of cabinets:
At a public location you will blow speakers and raise volume to an annoying level. It causes issues. I have seen it at other places.
I am not sure people see the timing of this Spike 2 headphone thing as coincidence but with Guardians of the Galaxy coming out I just assumed it is aperfect accessory for that based on Starlord using a wired headset. Just my opinion but that is why I am getting one for location.