First, the voltage. Your easiest solution would be to go to Radio Shack and buy a voltage converter. This will allow you to run 220 V appliances from your 110 - 120 V power supply. Make sure the unit you buy has a 2-blade plug on it like any other cord in your house.
The reason i say, make sure it looks like other cords in your house is because you can also buy a Travel Converter. The travel converter allows you to use your 120 V equipment in other countries (converts from 220 -> 110 instead of what you want 110 -> 220). These ususally have several odd-looking plugs with them that can be changed.
Also be sure you get an adapter that is for appliances and actually says it converts from 110 -> 220. Best bet is to talk with the Radio Shack, Frys or other electrical equipment store personnel. They have seen this question before.
For your second question, the speakers. High-end recievers are ususally sold without speakers. To find compatable speakers, look on the back of your receiver. It should say what power output (per speaker) your receiver will deliver. Usually between 35 and 100 W/channel. If you have a really powerful unit, then it may be upto 200W. This number will ususally be close to the speaker output jacks. Get speakers that can handle the power (speaker watts should be the same or Bigger than receiver watts). If you can't find speakers (or don't have speakers) that can handle that power, it is ok to use lower power rating speakers but don't turn the power up all the way. For example - if your speakers can handle 50 W and receiver can put out 100 watts/channel, then only turn volume up 25% of max. If speakers can handle 25 W and receiver is 100 W, only turn volume to 12% of max. This is only a short term solution - you will eventually not be able to resist turning it up more and you will "blow" your smaller speakers. This may also cause some damage to the output transistors on your receiver.
One other thing to look for on speakers - the "impedence rating". This is usually listed ont he speaker as 4, 8 or 16. On high power units, the 4 or 8 "ohm" is the common rating. The greek letter OMEGA may be used in place of the word OHM to show impedence ( the letter looks like a rounded version of _/\_ ). On high power receivers, you should make sure to match the impedence of the speakers with what the back of the receiver says to use (receiver will also say 4, 8 or 16 ohm - usually near the speaker output jacks - if not there, look all over the back panel or the owners manual).
Good luck.
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The most likely answer is no. Unless the power transformer is of the multi tap type and has a voltage selector window on the back panel... Most speakers today have an impedance of 8 ohms. The impedance is all you need to worry about when matching speakers. You can fit 8 ohm speakers to a 4 ohm system, but you cannot fit 4 ohm speakers to an 8 ohm system. It would overload your oputput stages and cause them to fail. It's best to match 4 ohm with 4 ohm, 8 ohm with 8 ohms.etc.
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