Some reviews of the T+A PA 3100 HV with it's separate PSU :
http://www.ta-hifi.de/wp-content/uploads/HiFi-News_PS_3000_HV_PA_3100_HV_Review_05_17.pdf
http://www.ta-hifi.de/wp-content/uploads/stereo-magazine-issue-10_mp_3100_ps_3000.pdf
http://www.ta-hifi.de/wp-content/uploads/HiFi-News_PS_3000_HV_PA_3100_HV_Review_05_17.pdf
http://www.ta-hifi.de/wp-content/uploads/stereo-magazine-issue-10_mp_3100_ps_3000.pdf