[Talonz]

Tested on my Creative Zen Xtra using RMAA.
Recorded using an Audigy 2 Standard, Radioshack shielded 3.5mm to 3.5mm cable.
Unaltered test files 44kHz test files, recorded in 48kHz mode to avoid resampling. "Record without monitoring" option enabled in the Audigy control panel.

Comparison:
Creative Zen Xtra on batteries
Creative Zen Xtra w/wallwart
Creative Zen Xtra w/wallwart + ferrite choke on the wallwart

Feel free to draw your own conclusions

Edit: Stupid me, link is here: http://andrew.cmu.edu/user/jwu1/hfi/zenxtra.htm

 

[Thisp]

88 dB SNR?

The results can't be too perfect as it's an Audigy, not the best for recording.. but that's still low for a full sized DAP. I guess you get what you pay for.

Thanks for the test.

 

[Talonz]

Sure thing.

I think the 88 SNR can be attributed to the fact that the volume was set to 21/25 for testing purposes. I didn't want to attenuate through the software and possibly stress the amp in the Xtra.

 

[MDDrew]

88 is is pretty good consider the iaduio 4 is supposed to have a real world performance of 80 db