I bought a cheap mains conditioner today, a Tacima CS929 from Maplin, it was only £24 in the sale. What hi-fi gave it 5 stars. Anyway the difference is mind blowing, for £24 I have more transparency and a smoother sound............................. Do mains filters really make that much difference. If so should I invest in a more expensive one ?? My hi fi is Musical Fiidelity / Accoustic Energy cheers