So, when buying a 100v PA Amplifier you have to do a very simple calculation. EG. If you have a 120W Amplifier you should not load it with more than 108W of speaker power. The general rule is to run the amplifier only at 90% of its full capacity. Lets say you speakers have tappings of 30/20/10 or 5 watts. At 30W you could attach a maximum of 3 Speakers. At 20W 5 Speakers. At 10W 10 Speakers and at 5W 21 Speakers.
Almost all of these amplifiers also have the option of Low Impedance outputs i.e. 4 to 8 Ohms so you can attach small amounts of these speakers on short cable runs also.
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