what does RMS stand for?
- Thread starter emilio
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emilio
New member
Re: what does RMS stand for?
oh. :22: when watt power rating is shown, is it always represented as RMS?
because i looked up the cab i have, (will soon buy) and it says 100 watts RMS, but the it also says that it can handle 120. i'm confused:
http://www.guitarcenter.com/Crate-G412-100W-4x12-Cab-102680469-i1146079.gc
oh. :22: when watt power rating is shown, is it always represented as RMS?
because i looked up the cab i have, (will soon buy) and it says 100 watts RMS, but the it also says that it can handle 120. i'm confused:
http://www.guitarcenter.com/Crate-G412-100W-4x12-Cab-102680469-i1146079.gc
PFDarkside
of the Forum
Re: what does RMS stand for?
Basically the average power over time.
http://www.myhometheater.homestead.com/RMS.html
Basically the average power over time.
http://www.myhometheater.homestead.com/RMS.html
emilio
New member
Re: what does RMS stand for?
so do you think i can push the cab to 130 that the head will drive?
so do you think i can push the cab to 130 that the head will drive?
Uk Ant
New member
Re: what does RMS stand for?
Ok, RMS (root mean square) is standard measure of of average power, I won't go too far into the mathematics or science as it's a bit dull.
So if you're amp pushes out 100w rms you'll need a cab that can take 100w rms.
Having said that you may be able to get away with a 100w cab and a 130w head but you'll find that the speakers will tend to flap a bit.
Another thing to consider is that if the minimum impedance shown on the back of your head is 4 ohms and the cab you're using is 8 then you won't be drawing all the power from the amp any way so it should be fine.
Ok, RMS (root mean square) is standard measure of of average power, I won't go too far into the mathematics or science as it's a bit dull.
So if you're amp pushes out 100w rms you'll need a cab that can take 100w rms.
Having said that you may be able to get away with a 100w cab and a 130w head but you'll find that the speakers will tend to flap a bit.
Another thing to consider is that if the minimum impedance shown on the back of your head is 4 ohms and the cab you're using is 8 then you won't be drawing all the power from the amp any way so it should be fine.
emilio
New member
Re: what does RMS stand for?
hmmm. about how much power would it lose. someone else here said that he went from about 330 (or something) to 210 (or something) when he changed the impendence from 2 ohms to 4 ohms. how much would i lose?
i got a switcht that allows me to go from 4 to 16 ohms.
hmmm. about how much power would it lose. someone else here said that he went from about 330 (or something) to 210 (or something) when he changed the impendence from 2 ohms to 4 ohms. how much would i lose?
i got a switcht that allows me to go from 4 to 16 ohms.
i love everyone
New member
Re: what does RMS stand for?
if the impedance switch is on the cab, and there's no impedance switch on the amp, then switching the cab to 16 ohms mono would almost certainly drop you below the 100 watts your cab can handle. theoretically it seems like the wattage would be cut in half if you doubled the impedance, but i guess that's not always the case.
if the impedance switch is on the cab, and there's no impedance switch on the amp, then switching the cab to 16 ohms mono would almost certainly drop you below the 100 watts your cab can handle. theoretically it seems like the wattage would be cut in half if you doubled the impedance, but i guess that's not always the case.
GoldenVulture
Braindeadologist
Re: what does RMS stand for?
*.*IMPORTANT*.* : If you are using an amp with VALVE outputs;It will use a transformer[output transformer] between the valves and the speaker. It,s impedance[Ohmage] should be matched exactly;any variation from its output impedance will only introduce distortion;and potentially screw up your output transformer.[and maybe blow up your amp]IT WILL NOT change the output Wattage.:firing:
That Equation of Impedance vs Wattage is only true for TRANSISTOR outputs.
It also affects your bandwidth. EG if the amp is rated 100 Watts @8 ohms;@ 4 ohms will increase your wattage and decrease your bandwidth;@16 ohms it will decrease your wattage and increase your band width.In other words ;@4 ohms ,it will be louder and dirtier;@16 ohms ,softer and cleaner.:kabong:
Also ;going under 4ohms stands a good chance of blowing up your output transistors.Only specialised amps designed to run that way should be used under 4 ohms.And there,s very few made that way.I doubt any guitar amps are!
*.*IMPORTANT*.* : If you are using an amp with VALVE outputs;It will use a transformer[output transformer] between the valves and the speaker. It,s impedance[Ohmage] should be matched exactly;any variation from its output impedance will only introduce distortion;and potentially screw up your output transformer.[and maybe blow up your amp]IT WILL NOT change the output Wattage.:firing:
That Equation of Impedance vs Wattage is only true for TRANSISTOR outputs.
It also affects your bandwidth. EG if the amp is rated 100 Watts @8 ohms;@ 4 ohms will increase your wattage and decrease your bandwidth;@16 ohms it will decrease your wattage and increase your band width.In other words ;@4 ohms ,it will be louder and dirtier;@16 ohms ,softer and cleaner.:kabong:
Also ;going under 4ohms stands a good chance of blowing up your output transistors.Only specialised amps designed to run that way should be used under 4 ohms.And there,s very few made that way.I doubt any guitar amps are!
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ModestCargo
New member
Re: what does RMS stand for?
I'd set the cab to four to match the head and just don't ride the amp so loud?
I'd set the cab to four to match the head and just don't ride the amp so loud?
emilio
New member
GoldenVulture
Braindeadologist
Re: what does RMS stand for?
I found one Amp that runs a 2 Ohm output;the Marshal VBA400;A bass amp.
They do exist.:kabong:
I found one Amp that runs a 2 Ohm output;the Marshal VBA400;A bass amp.
They do exist.:kabong:
