Poorly implemented amplification has around 100 ohms of impedance, while Eximus with good implemented amplification has 0,1? Lets see....
http://www.ti.com/lit/ds/symlink/tpa6120a2.pdf
FEATURES:
80mW into 600Ω
Minimum load impedance 8Ω
RECOMMENDED OPERATING CONDITIONS:
Load impedance 16Ω
Intermodulation distortion:
64Ω - 0.000095%
32Ω - 0.00014%
0,1Ω - ?
Total harmonic distortion plus noise:
10 kΩ - 0.000024%
600Ω - 0.00014%
64Ω - 0.00038%
32Ω - 0.00055%
0,1Ω - ?
Please check the datasheet by yourself (its easy and interesting) to see the impedances they (TI) use for measurements: 32Ω, 64Ω, 600Ω, 10kΩ. And which one is the best for perfomance/distortions ratio? 200-600Ω. And what about 0,1Ω? Nothing. Maybe TI have no idea what they are doing? Hmm...