Any comments are much appreciated, here to learn, just not been impressed by the occasional squeal from my switch mode PSU (given the drives and motors are near silent.... Drives do have fans on them, but no unusual noises, been brilliant drives since recommended on here), did consider the use of a TDK lambda 48v 1000w (FPS1000) PSU as they could be got on fleebay for not a lot and there is also no minimum load requirement, but kind of thought a smooth ac rectified power supply is probably better than a switched mode PSU.