I just want to know once and for all what rms is. For example if I have a sub that is rated at 400 rms should I be powering it at 400rms.
How come something is sometimes rated at 35rms but its peak wattage is 275.
What is more important to know the rms or the wattage. Any help on this would be great.
The RMS figure is what wattage that speaker (or amp) can take (or make)
continuosly
When a speaker or amp is rated 35rms but peak is say 275, the 275 is in most cases an estimate of what that item could do in a brief burst. In most cases the peak wattage is a number companies throw out there to make the item look better than what it really is.
The RMS figure is way more important number to go by than the peak number. The RMS is, as I noted above, what that speaker can take continuosly. In some cases you can go over the rated amount and not damage anything. But in nearly all cases you want to pair a speaker with an amp that RMS numbers are about the same
Cody Chanthaseny wrote:The RMS figure is what wattage that speaker (or amp) can take (or make) continuosly
When a speaker or amp is rated 35rms but peak is say 275, the 275 is in most cases an estimate of what that item could do in a brief burst. In most cases the peak wattage is a number companies throw out there to make the item look better than what it really is.
The RMS figure is way more important number to go by than the peak number. The RMS is, as I noted above, what that speaker can take continuosly. In some cases you can go over the rated amount and not damage anything. But in nearly all cases you want to pair a speaker with an amp that RMS numbers are about the same
RMS doesn't exist... well it kinda does... heres the kicker.....
It is used to calculate the true power of dB.... when you get the figure in to an RMS figure, you can't use that RMS figure to calcuate... ahah it's complicated
lol stupid Digital A/c and D.c electronics course............
all you need to know is that RMS is just a number.... the higher the number the more power........
but remember it does't exist.... lol
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thanks a lot guys I understand and I'll try to remember that it doesn't really exist.
music doesnt play at one solid wattage. it jumps around depending on bad notes, voices, ect. rms is an amount the speaker can take for a long time. the 35/275 you stated earlier means the speaker can take 35 watts continiously, but if at a cirtain part of the song, a really big bass note hits and the watts jump up to 275 for a moment, the speaker will be fine. that doesnt mean it can take 275 non-stop.
or at least thats what i've always understood.
SomeGuy wrote:music doesnt play at one solid wattage. it jumps around depending on bad notes, voices, ect. rms is an amount the speaker can take for a long time. the 35/275 you stated earlier means the speaker can take 35 watts continiously, but if at a cirtain part of the song, a really big bass note hits and the watts jump up to 275 for a moment, the speaker will be fine. that doesnt mean it can take 275 non-stop.
or at least thats what i've always understood.
kinda right... it's a certain wattage which produces constant dB gain, before it destorts at that sound wave length, but it can peak up to a given ammount.. example 1000 Watts......for a brieft mill or micro second...
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RMS = Root Mean Square (square root of the average squared values)
If you look at a graph of a sine wave, the value is changing continuously. The RMS Value is an average value of that sine wave.
It's essentially the area under the curve. The average amount of power delivered over time.
RMS = 0.707 x Peak value
Here's a decent definition
RMS
Heh I was just trying to make it sound as simple as possible without confusing him lol
Nothing I said was very complicated.
If you saw the equation for calculating RMS values for a sinewave, you'd realize that I was keeping it simple as well.
Labotomi wrote:Nothing I said was very complicated.
If you saw the equation for calculating RMS values for a sinewave, you'd realize that I was keeping it simple as well.
Did you get beaten for getting a B in high school calculus or something? Anybody who understood what you said probably wouldn't have a hard time with calc equations.
Thanks again for everyones replies I do understand the basics of what it is, I just hate it when certain brands don't give you the rms but give you the wattage.
Quote:
, I just hate it when certain brands don't give you the rms but give you the wattage.
In some cases you can cut the peak wattage in half and give or take a few watts (usually take) and come up close to the actual RMS figure.. Note this is only in some cases not all the time
Labotomi wrote:RMS = Root Mean Square (square root of the average squared values)
If you look at a graph of a sine wave, the value is changing continuously. The RMS Value is an average value of that sine wave.
It's essentially the area under the curve. The average amount of power delivered over time.
RMS = 0.707 x Peak value
Here's a decent definition RMS
lol I didn't think he would need to know all that.. but your right on...
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Roman Sotelo wrote:I just want to know once and for all what rms is.
Maybe more than he needed to know, but not more than he asked. Sorry if I tend to look and explain things like this mathmatically.
^^ Right but I was thinking he wanted to know from a consumer point of view not a world class professional's point of view
Labotomi wrote:RMS = Root Mean Square (square root of the average squared values)
If you look at a graph of a sine wave, the value is changing continuously. The RMS Value is an average value of that sine wave.
It's essentially the area under the curve. The average amount of power delivered over time.
RMS = 0.707 x Peak value
Here's a decent definition RMS
Glad those 5 semester of calc are paying off
. All starting to make sense.
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I use RMS values every day at work, and if Labotomi hadn't done it already, I would have.
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and i'd let labotimi answer it because i hate math lol
basically just figure rms is the average amount of power you can feed a speaker. when it comes to max. that number is only really valuable if you know how good the company is. a cheap companies speaker may say 1000 watts. their speaker may be able to handle that for a second or two before the speaker blows because they overrate their equipment to make it seem allot better then it really is. a quality speaker may say 1000 watt max. and it may be able to play 1000 watts all day long without any issues because they underrate their equipment.
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