In the consumer electronics world, you will often hear about watts, power handling, and power output. The terms are used interchangeably to refer to two values, that is, root mean square (RMS) and peak power rating. Power rating is among the essential factors that contribute to an ideal sound system. It is, therefore, important to know what these two values refer to whether youre searching for speakers, amplifiers, or subwoofers.
When looking to build a high-performance entertainment system, most people tend to shop for audio and sound equipment based on the one that has the highest power rating. However, this may prove difficult for starters who don't understand the difference between RMS and peak watts. Also, some may choose to ignore the ratings and go for brands, but this will affect the final outcome in one way or another.
So, if youre going to spend your hard cash on a surround-sound speaker, subwoofer, or even an amplifier, you'll need to have basic information on power ratings. This comprehensive guide will help you understand these two values to assist in you assembling a decent sound system.
RMS Watts Explained
Root mean square or simply RMS watts refers to continuous power handling of a speaker or a subwoofer or how much continuous power an amplifier can output. RMS values are usually lower than peak watts ratings, but they represent what a unit is truly capable of handling. Think of RMS power as the average power that a speaker can handle on a daily basis without compromising sound quality or experiencing any distortion.
Peak Watts Explained
The peak power handling is the highest power level that a speaker or a subwoofer can handle in a short burst without blowing. The same holds for amplifiers as the absolute highest amount of power they can put out before failing or without resulting in distortion.
We can think of peak watts as the number atop of your car's speedometer. For example, you can drive for maybe 180km/h, but you can't sustain that speed for long without causing mechanical or thermal damage to the car. In the same way, the peak power level can only be maintained for a fraction of a second, although theres no clear definition of how long.
If the unit is subjected to constant peak power, the wires may overheat, which could quickly damage the voice coils.
RMS Power vs. Peak Power
When shopping around, you'll notice that some manufacturers rate their products' power-handling capabilities using either the peak watts rating or RMS rating, while most use both values. For example, a unit can be rated at 150 W while another brand may be advertised at 75 W.
At first glance, one might be tempted to think that the former is better because its rated at a higher power level than the latter. However, upon a closer look, you may notice that the first product is rated for peak watts while the second one is advertising RMS watts. Typically, a units peak power handling is double the RMS power handling, which basically means that the above products are actually rated the same: 150 W peak/75 W RMS.
Most audio equipment manufacturers, though, prefer to stress more on the peak power rating to make the products look like they deliver more power than theyre capable of. While this may sound convincing, utilizing peak power not only disturbs your neighbors, but also makes your sound equipment depreciate in value, requiring you to replace some parts or buy a new unit altogether. As such, if you want to your speaker to last for years, the figure to look out for is the RMS wattage, the power input at which you should be enjoying your music.
However, when it comes to these technical details, don't get confused by speaker power ratings and amplifier specifications. Amplifiers generate power in an audio system, which is not the case with speakers and subwoofers. Therefore, speaker power ratings refer to the amount of power your speakers can handle from an amplifier. The specifications on the amp, on the other hand, refer to how much power it can produce for maximum audio performance.
Conclusion
Both RMS and peak watts play an important role in your sound system, and theyre vital when comparing your speakers with amplifiers or subwoofers. When matching speakers or subwoofers to amplifiers, you should compare either two RMS values or two peak ratings.
Therefore, one should not get confused when comparing peak and RMS ratings. This will ensure that you'll get the best out of each component. If the power outputs arent correctly matched, the components can overheat and create a couple of other issues. However, its important to stress that you should always use RMS ratingsnot peak wattagewhen matching and comparing gear.
David M. Foster is Head of Content at SpeakerChampion.
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