A power amp-amp is short for amplifier-comes a set of ratings. The series of numbers explains how the machine operates and what to expect. Read the rating to determine the fit of the amp with its use. For instance, a rock band often chooses the maximum outputs, while a church group goes for something less powerful. Read on to learn more.
Instructions
1. Look at RMS power. RMS stands for root mean squared. Unless you want to do the sine curve calculations, understand RMS power simply means power output. Most audiophiles say this is actually a meaningless number.
2. Read the peak power numbers. This is what happens when all channels are engaged. No amp can sustain peak power for long, but numbers in the 12,000 range are impressive. Again, audiophiles say this interesting but not all that telling.
3. Look at the Federal Trade Commission (FTC) rating. Here you get average power output and industry standards. An FTC rating is a general guideline that the amp power is acceptable. It's based on 2 channels in operation.
4. Read the Electronic Industry Association (EIA) rating. This tells you the power output for one channel.
5. Compare watts. There's a difference between 200-watt and 400-watt output. Logically, there's much less of a difference between 200 watts and 220 watts.
6. Evaluate the ohms. Generally amplifiers are wired for 8-ohm output. Be suspicious of a 4-ohm output; manufacturers have to wire the power supply in a different way to support this level. Check carefully.
7. Talk to a sound engineer, audiophile or similar expert. Understanding the terms of RMS, peak power, watt outputs and ohms in a general sense is a good idea, but the technical specs on amps vary and can be misleading at times. Let the experts guide you.
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