Umm, they can probably explain better that me:
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"Mains cables and blocks that actually combat background noise resulting in a dramatic reduction in high-frequency distortion and listener-fatigue, most notably at higher sound pressure levels. The improvements across the whole audio spectrum can be exemplified by an enhancement in clarity and projection of the mid-band, giving greater agility in associated bass performance."
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http://www.merlincables.com/mainSt.htm
In terms of the TV, it cleared up a kind of fine 'noise mask' that was due to electrical interference. It also retalis at £85!! I should just note that my local shop put a 60% discount on it as we are good customers.
As for the 'phono' reference. The speakers are bi-wired. I have those banana type plugs, so I am a little confused - the picture of the speakers is only an example....not mine