# does an amp really put out what it says in rms????

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• 09-10-2004
hardrockfan
does an amp really put out what it says in rms????
Does an amp actually put out the rms it says it does? example: 500 rms X 1 at 4 ohms
• 09-10-2004
ANeonRider
Re: does an amp really put out what it says in rms????
does your mom work the corner?
• 09-10-2004
davesexplorer
Re: does an amp really put out what it says in rms????
:readytog: :wow:
• 09-10-2004
Trixter
Re: does an amp really put out what it says in rms????
Actually an amp that says it puts out 500w rms will actually do more.

Use this formula:

Ap: Actual Power
rms: rms value
La: length of amp
P: purchase price

Ap = {(10^7 x P) / [(5.42 x rms) / (721.98 / La)] / (rms x 100)} x 4

so let's say:

rms: 500w
La: 12
P: \$299

{(10^7 x 299) / [(5.42 x 500) / (721.98 / 12)] / (500 x 100)} /x 4
[(2990000000 / 39.225) / 50000] x 4
(7622689.611 / 50000) x 4
152.45 x 4
609.8w rms
• 09-10-2004
maylar
Re: does an amp really put out what it says in rms????
That formula only works for black and copper colored amps. For chrome amps you gotta divide by 4.
• 09-10-2004
monte_carlo97
Re: does an amp really put out what it says in rms????
Quote:

Originally Posted by maylar
That formula only works for black and copper colored amps. For chrome amps you gotta divide by 4.

I thought it was 3.5. [email protected] so all this time i was telling people the wrong numbers. I can't beleive i let myself overrate them.
• 09-10-2004
LBX2G
Re: does an amp really put out what it says in rms????
you guys have got to be kiddin me.......
• 09-10-2004
3.5Max6spd
Re: does an amp really put out what it says in rms????
assuming you are getting a steady 14.4v (or whatever) rated voltage is, it should - if you are running another amp and your total current draw surpases the ability of the alternator then no- lenght and size of wire play a big part also- in other words in a 'perfect world' yes it should, but very few live in that world-
• 09-10-2004
Alpine CDA-9815
Re: does an amp really put out what it says in rms????
Quote:

Originally Posted by maylar
That formula only works for black and copper colored amps. For chrome amps you gotta divide by 4.

It also sometimes works for dark gray and gold colored amps... but that's only if they have no logos on them.
• 09-10-2004
JimJ
Re: does an amp really put out what it says in rms????
and subtract 5 for every time the amp's power is printed in BIG HUGE BOLD NUMBERS on the amp case...
• 09-11-2004
Norcalracer283
Re: does an amp really put out what it says in rms????
**** the ****ing **** *** ****ing amps.....go **** yourself in the ****ing *** you little *****...who cares about rms, you like your ****ing system or not, thats what ****ing matters....punk *****
• 09-11-2004
supa_c
Re: does an amp really put out what it says in rms????
What about Brand name ?
IIRC you divide the price by the value of the letters
Ex. A=1 B=2 C=3 ect.
P.S
*******<-- not cool
• 09-11-2004
squeak9798
Re: does an amp really put out what it says in rms????
Quote:

Originally Posted by Norcalracer283
**** the ****ing **** *** ****ing amps.....go **** yourself in the ****ing *** you little *****...who cares about rms, you like your ****ing system or not, thats what ****ing matters....punk *****

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