What Does RMS Stand for

What Does RMS Stand for

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RMS (root mean square) is a comparative number, measured with a profilometer with respect to the surface. A finer finish is in the 20 to 40 RMS range, a machined finish is generally in the 80 to 120 RMS range, and sandblasted surfaces will be in the 400 to 500 RMS range. I liken this to measuring the up and down motion of a diamond stylus as it slides through the grooves of an old 45rpm record.

Skateboard type surface roughness testers are common tools in stores. A diamond needle rests on the entire sample and a piezoelectric pickup record all vertical movement. The peaks and valleys are recorded and converted to the known value of the given parameter.

Parameters vary in the way you view peaks and valleys. The most popular parameter is “Ra”. Ra is commonly defined as the arithmetic mean roughness. While the Ra parameter is easy and efficient, there are other parameters that may be more specific and useful depending on the application requirements. This is the parameter that allows us to define the surface roughness.

Today, for the purpose of testing Ra values, the use of portable surface roughness testers is not only inexpensive but also digital and easy to use. These surface roughness testers are a requirement for any shop operating to Ra requirements. These values ​​are then reported as Ra values ​​or RMS values. RMS is defined as the root mean square of the Ra values: the calculated value of the mean values. 

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What Does RMS Stand for , Some other RMS Abbreviation

  • RMS (Root Mean Square) Technology, Engineering, Computing
  • RMS (Rhabdomyosarcoma) Medical, Nuclear Medicine, Oncology
  • RMS (Royal Mail Ship) Military Rank, Canada,Yachting
  • RMS (Ratcheting Mule Shoe) Oilfield, Engineering, Gas
  • RMS (Radiation Monitoring System) Nuclear, Technology, Radiation
  • RMS (Richard Matthew Stallman) Computing, Technology, Information Technology
  • RMS (Remote Manipulator System) Exploration, Cosmos, Technology
  • RMS (Record Management Services) Computing, Programming, Technology
  • RMS (Radiation Meteoroid Satellite) Satellite, Technology, Space
  • RMS (Radionuclide Monitoring System) Nuclear

Why is RMS Used?

Unlike DC voltages that are constant over time, AC (alternating current) voltages vary with time and are sinusoidal in shape. The RMS value of an AC signal is equal to the DC voltage that would be required to produce the same heating effect (power). The RMS of the electrical network in the USA is 110VRMS and in Europe it is 220VRMS.

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RMS Power in Speakers

Manufacturers cannot quote a simple number for speaker power output as it differs in a piece of music. You can have quieter segments that require less power and more power. So you can’t take the power output at any point, you have to average the output at multiple points.

The RMS rating is the most accurate way to do this. But different companies calculate it in different ways, so it can still be difficult to compare company results reliably. However, if the product is CEA certified, it would have been tested using standardized methods, allowing you to directly compare the ratings.

RMS, Average, and Peak Energy

Engineers and speaker manufacturers measure audio power in terms of average, peak, and RMS watts:

Peak energy:

Peak power is the maximum reading achieved when measuring the playback of a normal song. This is the highest / maximum power a speaker can start to distort or clip at any time.

Average energy:

Average power tells you how much power a speaker can deliver over a long period of time.

Technically, this is the AC voltage at the terminal of a speaker, many times that of the speaker, the power factor (this number is related to the efficiency of the system).

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RMS is the effective power. RMS power can be obtained by dividing the speaker current by 1.414 (square root of 2). It can also be obtained by multiplying the peak value by 0.707. This gives you a number close to the average value and provides a more accurate estimate of how to handle the continuous power of the speaker.

Speaker comparison

As we have already established, most speaker manufacturers usually indicate the maximum power so that the product looks better than the buyer, although this may not happen.

However, by using RMS (lower number) values, you can get a better idea of the speaker’s capabilities to handle power for longer periods of time.

When choosing the type of speaker you want to buy, you want to compare the RMS rating of one model to another. If you make the mistake of equating RMS with maximum values, you will make the most inaccurate decision.

The truth is that, when comparing speakers, only RMS is used, others are useless. This is because RMS refers to clean power/wattage. Think of RMS as a correct hearing rating.

Other Purchase Ideas for Speakers

Of course, RMS and maximum power output should not be concerned about the average buyer. Many of us would not be in a position to play our music throughout RMS and certainly not with full force. So what ideas are important?

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Speaker type

There are many types of speakers and they all provide different experiences. They are:

Stereo speakers

Available in pairs with a subwoofer or as 2.1 Sound quality according to price and available in all shapes and sizes.


Traditional speaker type with a flexible cone held by magnets The cone vibrates with the sound.

Surround sound

Home theater or computer speakers are sold as 5.1 or 7.1 with five or seven satellites and a subwoofer.

Electrostatic speakers

The audiophile’s choice uses conductivity to move air over a thin film. Maximum sound reproduction, but you really pay for it. It will have various sizes, libraries, positions, subwoofers, car speakers, computer speakers, and the four main types. What you buy will depend on where and how you want to use them.

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Select RMS-Based Amplifier

If you carefully review the specifications of the individual speakers, you will see that the amplifier indicated by the manufacturer has a range of power ratings.

Shows how much power the speaker can comfortably take. This range is typically 50 to 200 watts per channel; you should buy a powerful amplifier before you can cause major damage to the system.

The suggested amp range is an easy way to describe the capabilities of speakers and makes it clear that they will handle them comfortably without ruining your vocal cords.

It makes it easy for you to understand what is required for your sound system without the need to understand many technical issues. It also indicates that you have several options for the amplifier to match the power of your speakers. Ideally, you should try to find a close match between the RMS values ​​of your speaker’s amplifier.

This indicates that a 150-watt amplifier is not required to match a 150-watt speaker. Anything that matches correctly will be great as long as you don’t push your system to the extreme to avoid problems. However, we recommend running it to protect the speaker from a slightly lower amperage rating.

However, you may have an amplifier that is less powerful than the speaker’s RMS ratings. This is because you can regulate the amount of volume entering your speaker, and when it starts to exceed your threshold before it causes significant damage, you can immediately notice it. On the other hand, a low-power amplifier will need to re-read the volume control to achieve the appropriate sound level.

When you do this for a long time, the amplifier will start sending clipping waves and damaging the speakers. Keep in mind that you want a comfortable listening volume that can easily handle odd musical peaks.

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Both RMS and Choti Watts play an important role in your sound system and are important when comparing your speakers to amplifiers or subwoofers. When matching speakers or subwoofers with amplifiers, you must compare two RMS values or two maximum values.

So, don’t get confused when comparing peak and RMS ratings. This will ensure that you get the best out of each component. If the power outputs do not match correctly, the components can cause more heat and other problems. However, it is important that you always use RMS ratings, not Peak WattsAge, when matching and comparing gears.

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About Author
An engineer and MBA, who is a technology and a gadget freak. I write about smart home solutions and gadgets like all wireless devices, technology brands like Apple. Love to follow the latest trends in the technology space and write about latest developments.