T470s and Surface 3 audio quality REALLY measured

Further reviewing / playing with the Lenovo T470s I found bass lacking quite a bit while listening to some hires FLAC files. So with some soldering iron and digital scope at hand I went ahead and took a look at the actual signal coming out of it, and the Surface Pro 3, and a TEAC HA-P50. Command line sox notes on my blog at: https://rene.rebe.de/2016-12-06/synthesizing-audio-with-sox-on-linux/

Lenovo T470s: http://services.exactcode.de/amzn.cgi?index=electronics&keywords=Lenovo%20T470
Microsoft Surface: http://services.exactcode.de/amzn.cgi?index=electronics&keywords=Microsoft%20Surface%20Pro
Teac HA-P50 http://services.exactcode.de/amzn.cgi?index=electronics&keywords=Teac%20HA%20P50

I also have a blog post about 32-bit DACs: https://rene.rebe.de/2016-12-31/the-32-bit-dac-scam/

Update: I just realized the Surface 3 Pro can have power-line hum on the headphone output! :-/