All In the tests

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As far as the converters are concerned, I made a few measurements with Right Mark Audio Analyzer, and the results were very convincing. See for yourselves:

 

Testing device	Line 6 TonePort UX8
Sampling mode	16-bit, 44 kHz
Interface	DirectSound
Testing chain	External loopback (line-out - line-in)
RMAA Version	6.0.6
20 Hz - 20 kHz filter	ON
Normalize amplitude	ON
Level change	0.0 dB / -0.8 dB
Mono mode	OFF
Calibration singal, Hz	1000
Polarity	inverted/inverted

Summary

Frequency response (from 40 Hz to 15 kHz), dB	+0.03, -0.12	Excellent
Noise level, dB (A)	-96.4	Excellent
Dynamic range, dB (A)	96.4	Excellent
THD, %	0.015	Good
THD + Noise, dB (A)	-74.2	Average
IMD + Noise, %	0.018	Very good
Stereo crosstalk, dB	-88.1	Excellent
IMD at 10 kHz, %	0.048	Good
General performance		Very good

Frequency response

From 20 Hz to 20 kHz, dB	-0.45, +0.03
From 40 Hz to 15 kHz, dB	-0.12, +0.03

Noise level

	Left	Right
RMS power, dB	-95.1	-93.4
RMS power (A-weighted), dB	-96.2	-96.6
Peak level, dB FS	-83.5	-81.6
DC offset, %	+0.0	+0.0

Dynamic range

	Left	Right
Dynamic range, dB	+95.1	+93.5
Dynamic range (A-weighted), dB	+96.2	+96.6
DC offset, %	+0.00	+0.00

THD + Noise (at -3 dB FS)

	Left	Right
THD, %	+0.0145	+0.0150
THD + Noise, %	+0.0149	+0.0157
THD + Noise (A-weighted), %	+0.0191	+0.0198

Intermodulation distortion

	Left	Right
IMD + Noise, %	+0.0173	+0.0180
IMD + Noise (A-weighted), %	+0.0137	+0.0136

Stereo crosstalk

	Left	Right
Crosstalk at 100 Hz, dB	-97	-96
Crosstalk at 1000 Hz, dB	-90	-84
Crosstalk at 10000 Hz, dB	-70	-66

IMD (swept tones)

	Left	Right
IMD + Noise at 5000 Hz,	0.0418	0.0398
IMD + Noise at 10000 Hz,	0.0442	0.0419
IMD + Noise at 15000 Hz,	0.0634	0.0595