the line out is used to feed the DAC to a different amp than the D3 if you want to do that.
The D3 has a great DAC and you could use it with your home amp for example.
So the line out skips the amp and doesn't need batteries.
Actually, from all that appears from the specs, and from what iBasso has said, the DAC is identical on the D2 Boa and D3 Python. The amps differ, but not the DACs -- unless you have additional information...
The D2 does not sound bad, in fact with an appropriate choice of opamps, it sounds superb, however the D3 has a more 3-dimensional soundstage which I have been unable to duplicate in my Viper.
It is an intangible, probably unmeasurable difference that one can hear only by A-B comparisons. I do think the D3 DAC is improved over that of the Viper, and does not require any battery power when using only the DAC, if that is a consideration of use.
The D2 Boa's opamps are soldered on and generally unrollable for the lazy and unwilling (such as me
). The old D2 Viper is roughly the same size as the D3 and has opamp sockets for easy rolling but was only on a limited run.
If you only plan to use the DAC/Amp combo with your laptop, I would suggest for you to get the D2 Boa which can run entirely off of USB power (meaning the DAC and Amp at same time) since the internal batteries recharge through the USB cable. The D3 has no recharge ability and if you were to use the Amp with the DAC at same time, it would run off battery power. It also helps that the D2 Boa is smaller.
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