Assuming that any obvious set-up issues have been dealt with and you are still not happy with the performance of your equipment, your options are to live with it or to change it.
So how do you decide whether to upgrade the equipment you have or put a James Audio power conditioner to the test? As a common-sense rule, you will always reap the greatest benefit from addressing the most limiting factor.
As a generalisation, the impact of mains noise becomes more apparent as the quality (i.e. sensitivity) of the equipment improves. If you are using budget equipment, then in all but the most extreme circumstances, we would recommend that you check out equipment upgrades first. If you have made a significant investment in quality equipment, the use of a power conditioner becomes a more sensible option.