To me it sounds as if your problem is simply that the phono pre amp/cartridge has insufficient gain to drive the amp. This doesn't sound like an impedence problem - usually impedence problems are evidenced by a loss of high and low frequency info, not volume. If by referring to your Hafler you mean with that in the loop as opposed to the EVS then the answer is there is inadequate gain from the phono pre and you will need an active pre amp.
Impedance problem with Rowland model 5?
I have a Rowland model 5 that I have been using with EVS attenuators(the kind that fit on the amp's input jacks) and my cd system with great results. Recently, I have experimented with analog, but I have to turn my attenuators to max level just to get a little sound. I am using Hales System II Signatures. The phono preamp is the Camelot lancelot Pro and the cartridge is the Virtuoso wood. I ahve adjusted the preamp according to the specs for the cartridge. Could this be an impedance problem? If so how do you adjust the impedance on a Rowland? I heard it was adjustable, and I do not have a manual. I have a cheap hafler preamp that works fine with the Camelot phono preamp. Any help is greatly appreciated.