Quan, sadly most of the product in the USA IS from China. As I have little idea of what shipping costs will be, import taxes, bribes, and so on.
You will need to make sure all equipment will operate at 220V 50Hz.
For example: QSC powered speakers and Presonus Studiolive mixers have universal power supplies
A digital mixer plus active speaker and some wire will pretty much cover your needs as much as I can guess at them. For theater work I find it very benificial to have 3 Crown PCC 160 microphones in stage plus a number of Shure ULX wireless headset mics.
Thank you so much for your advice.
In our country we use 220V 50Hz for electricity. So no problem. If diferrent, I can use transformer or voltare stabilizer. But voltare stabilizer or transfomer or insolation tranformer is better?
So I have the configuration for sound reinforcement system:
PreSonus StudioLive 16.4.2 16-Channel Digital Mixer with FireWire Interface
QSC K8 2-Way Powered Speaker (1000 Watts, 1x8")
Regarding wireless headset mic, I can buy in Vietnam
Crown PCC-160 Boundary Microphone
I have a question. Crown PCC-160 is a boundary microphone on the floor, so can it be used for vocal and instrument without overhang mic? And whether the foot step of perfomer can affect too much on it.