I just used 2 of these SMPS +-45V on recent diyaudio VSSA amp. The output + and - is different around 0.05V only. This is the 1st time I am using SMPS, slightly worried on the noise. The result is contrast. Background noise is vey clean. Hardly to hear any noise on speaker. The bass is deep and clean. Thanks for Connexelectronic with such good products!