Click/ Snap from the speakers

Hi All,

This is the first time I have posted anything on the forum and I hope this is the right place to be asking this question.

I have a McIntosh MC 402 amp and XLS 360 speakers and I play all my music through my mac, no pre amp or any other equipment.

I can say I am reasonably satisfied with the sound but I have been hounded by a click/snap sound when I switch the lights on and off or when the dish washer or washing machine comes on.

I asked around town here and the experts told me that

1-I need to buy a Monster Surge protector or if the budget allows a conditioner. I would like to know if that is the and case.

2-What happens with the power plugs if i move countries in the event I buy a surge protector, which imho is just like a big multi plug/ extension thing ? Do I use an adapter ?

3- Have been looking at pre amps, the C 46, C48,C50 in particular, would like to keep it in the same family,

I have learnt that the pre amps are a huge improvement but I dont have a CD player and use my MAC as the pre amp and I will still use the Mac as my source even after, so I was wondering if its a good idea to invest in one or just save up for something else.

Thank you in advance for all the help and advice,

Regards
V