Complete sound systems can be purchased on this website. The next step up is to buy individual components. Here is a very generous rule of thumb regarding wattage: Under 500 sq. ft: 20-100 watts; 500-100 sq. ft: 100-500 watts; 1000-2000 sq. ft: 500-2000 watts; Over 2000 sq. ft: 2000-4000 watts
Most folks purchase more than they will ever need. If you can test a sound system of a particular wattage, you’ll have a much better idea of your requirements.
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