Does anyone here use a Marantz pm7200 amp in class A mode and can honestly hear a difference?A certain mag claimed that switching to class A the amp suddenly takes on a liquid qaulity to compare with some £1000 units! I dont bloody think so!Of course its a nice amp for the money but please come on. Is it true the source direct needs to be switched out for the class A to work? Surely this defeats the object of a pure signal?