Your sub is not going to work well with the Zero,s. The Arcam has plenty of drive for the Zero,s and I have NHT speakers in all my systems. I still own the super Zero,s and I personally disagree that they are bright. The have no bass but when mated with a quality sub and correctly set up sound quite good. They like current which the arcam has. Stick to copper speaker wire and the Arcam which I have also owned could sound unruly with some cables. I had good results with Vanden Hull D103 mkii cables. Another pre amp won,t change your outcome with your current speaker set up. I personally would look for a better sub that is more musical bass or just get another set of speakers that reach a little lower. If you listen to mostly rock music you really don,t need to be trying to get in the lower 20 hz. The zero,s can sound quite good but a quality sub set up and crossedover properly is a must. The Spica TC-50's or even a pair of studio 20 paradigms and quite a few other monitor,s would be cheaper and easier to set up. Cheers.