O2's case is held together by screws and is intended for infrequent battery access.
So, a single set of batteries should last for years. No need to order four sets.
Hey dude, thanks for the reply! I intend to use only the stand alone ODAC and use the new ifi ican as my new amp.
I regretted buying ODAC + o2 as a single unit but it's too late for it now!
its easy to do, but your going to have to put in into a case or use is bare bones, it has a micro usb input but no audio out jack.
you will have to hard wire or add a output jack for that....again not hard but a minor pain.
you should call JDS labs and they can sell you the jack and external case and endplates..
I believe these are the parts you will need, and a soldering iron to attach the 3.5mm socket to the board.
With a little bit of creativity you could also fit one into an O2 enclosure so they are both the same size.
Getting another O2! I sold mine 4 months ago for something that was more expensive but much worse. Big mistake.
I still think it's the 2nd best amp i've heard. The other one costs almost 3x as much new.
I like how when I connect many different sources to the O2 I can totally expect to HEAR what's connected (unless it's transparent) without much change coming from the O2.
Despite how some say the HD-650 sounds "lifeless and boring" with the O2, I actually love it. I don't want to add a single thing to the HD-650's sound.
O2 was one hyped up amp that is actually as good as they say to my ears.
Well, if it sounds similar to the O2 I'd like to check it out sometime. I've always been looking for amps similar to an O2.
Right now the closest match i've found to the O2's sound is the Headroom Micro Amp, but only with the Astrodyne power supply (I won't go there..it's cheap).
It costs way more and is discontinued, but maybe i'd fail a blind A/B test between the two.
Some brighter headphones might be like 2% better on the Micro, but that's nit-picking.
I've owned many a couple dozen headphones since owning it and they all sound good with it and without any extra coloration. I bet i'd get similar results with the O2.
This makes sense considering the Micro is made by a company that sells headphones
Like the O2, the amps sound can change depending on what's connected as a source (unless it's transparent).
BTW often when I used the O2 I'd keep forgetting it's battery powered and transportable!