Well, over the past few days a few tweaks have been in progress. These can be broken into two categories. First is the speaker stands. Second is the CD player. The speaker stands have been fitted with their replacement base spikes, new top-plate spikes, and filled with sand to about 80% capacity. They also now reside on stone slabs. I suspect that they are overfilled with sand, as the bass became a little bit thin. However, the upshot of this was that I could move the speakers back a little and get the bass back, but tighter than it was before. The CD player has been reclocked, and gained much in terms of separation and clarity and detail. The clock will take some time to settle down, but it's turning out nicely. The point is that tweaking is worth doing. Spending £200 on a tweak might seem anathema (and it did to me in the past), but as I've seen it make more difference than replacing a component with one worth £200 more, I'm a convert. Mains and isolation are coming soon...