Do you notice any SNR / hissing issues? My impression is that the icepower are not as clean as say purifi
Purifi is certainly lower noise than any ICEpower amp but the ICEpower amps are not bad in terms of noise. System noise floor is often governed by the DAC and that should be true of the 125ASX2 assuming you are using a relatively low noise modern DAC.
To me compared to Hypex / Purifi the 125ASX2 has the following drawbacks.
1) In stereo operation only accepts unbalanced inputs.
2) Higher output impedance which results in more load dependent frequency response.
3) Higher THD+N at higher frequencies.
The ICEedge based ICEpower amps like the 1200AS1/AS2, 300A1/A2 and 400A2 do much better in the areas mentioned above but still fall a bit short of Hypex / Purifi performance.
Michael