Does anyone have any feedback on NVA...??? I've been thinking of buying an NVA P50sa passive preamp to use with my Samson Servo 600 but I seem to be getting on with the amplifiers inbuilt gain controls just nicely. Is there really any point of spending two hundred and sixty quid on a glorified switching box...? The advantage of the NVA is that it has three sets of outputs and I was thinking of bi-amping a new set of speakers with a Servo 300 for tweeter duties. Back to where I started from... any feedback anyone...???