Originally Posted by eyaln24
By portable I mean something that runs on its own batteries.
I think I'll be connecting it to my Macbook Pro, PC, my Android phone and my iPad (Pretty much everything...).
I do not know anything about the Oppo & Leckerton.
The version of the ODAC/O2 that is combined into one unit, has the internal battery removed to make room for the ODAC, so it's amp runs off AC power only.
If you buy these ODAC and O2 as two separate parts, then the ODAC would run off whatever source that it is connected to (USB) and the O2 could run off it's internal battery.
The ODAC (non-combo unit) would work with any computer (PC, Mac, desktop, laptop), but not the Android, and not really sure about the iPad(?)
So I'm guessing the FiiO 18 is what I would think would be the best option.
It can function as an "amplifier only" with any of your devices, it's USB DAC feature with work with PC or Mac, it's USB DAC feature might work with the Android & iPad