I'm amazed this is on page 3 with no major fighting involved (Unless its been modded?)
Anyhoo:
With the equipment you have I really recommend NOT using the tacima with your maps. Theyre far too good to be strangled with it. Use the tacima for all low current equipment (cd player etc)
I have quite power hungry equipment and by far the best improvement I have had is by using the balanced mains transformer which splits the voltage from +230 to +115 and -115 which reduces noise on the mains line. Rather than changing mains leads etc, that would be my first port of call (So long as the transformers big enough for what you have)
I believe mains can make a considerable difference to sound quality but depends on quite a few factors. If your equipment has large transformers in them for example then they will reduce the noise to some degree. Obviously the users quality of hearing makes a major difference as to whether or not they would be capable of haring differences. If there is zero mains noise on the line then there is nothing to clean anyways (Although I suspect just about everyones hifi has 'some' noise going through it)
Also make sure the speakers are as solid as you can get them. If theyre moving around at all in use then that will probably negate any positive effect cleaning the mains would do.
I have tried my A5 power amp through the mains direct, through the balanced mains, through my Isotek mains conditioner and through both of them. The sound is definitely 'cleaner' and more detailed through both in my system (Though you must realise the balanced mains cant possibly strangle the amp, and the conditioner is designed with amps in mind and is far more expensive than the tacima)
As a side note, I have also tested the Nordost mains conditioner with a very powerful 2 channel amp, and it strangled that! So dont assume throwing money at something will help.