I use the 5k for my ath msr7 headphones, and in my car via the auxiliary port. Both are sensational. I very seldom use the bluetooth, but it seems to work just as well. I sometimes have a hard time turning it on via the buttons on the 5K, clearly my only issue. Really gives me the blues sometimes!

Nothing wrong with the buttons. Inside there are options to configure the buttons, as you wish.

For example I need to press both lower buttons at the same time to turn it on and off. Now it’s very easy and intuitive.

Sound quality is extremely clear though, which is the best thing about this device. Beats my desktop sound DACS for the same price.

Best little audio device ever. But…

I’m with what that other guy said: I hate the buttons. Every time I use it, I have to look up the PDF manual just to remember how to turn it on. (You have to hold down the blue button for 3 seconds. Actually, that also turns it off…um…it beeps when it turns on. Oh and, um, the button doesn’t actually light up blue until you turn it on, so…it’s the “not red” button. Oh, also, there’s actually a difference between "lower blue button’ and “upper blue button”: it’s sort of like a dual button. So make sure you press “lower” side. Erm, I guess it’s really unclear what “lower” means given that it depends how you orient this device, isn’t it? So, you….well…actuallly, I can’t explain it. Just look up the PDF manual and look at the diagram.)

I love this product. I hate the buttons. I really hate them. The product is so good, I will buy the next version if there is a slight redesign of the buttons. I am really enjoying it otherwise

I also want to know if volume balance is an option – there is independent left right eq but it’s not clear if the volume can be adjusted there.