Eh, i go scout for amp at few accesories shop and i noticed that the amp itself don't state how much RMS it provide. So how to check for the RMS?

depends on what sort of amps your ar looking at
branded amps like alpine, steg, tru, genesis usually isplay their RMS ratings
those cap ayam ones will display peak

RMS ratings are usually 200w and below

Use an RMS multimeter. (expensive)

Or you could learn basic electronic theory and find other ways to find out.

looking at the box loh....

use a much higher programme power speaker, know the fact of this speaker .. the important one.. the sensitivity of it( say 100dB SPL @ 1w/1m) ... full blast the amp.. input a tone.. say 1000Hz( 1kHz is a standard tone for testing).. make sure ur input is 0dBv ( u should use an pre-amp to do this)..

put a SPL meter 1m away on axis of the speaker... see wat kind of level it is... let say u get 115dB...

115db - 100db = 15dB extra u get compare to 1W/1m...

the RMS power of ur amp can do is added 15dB to the speaker compare to a 1W amplifier..

every time power double.. double of 1W = 2W.. double of 2W=4W.. double of power will give u extra 3dB to speaker..

15db=3+3+3+3+3...

u need 5 times double of 1W then only u get 115db..

which is 1 X2 X2 X2 X2 X2 = 32W RMS...

*** all calculation above assuming amp n spk also @ 4ohms rating..

easiest way is to "guess" it
by the num of the fuse

80% accuracy

Thks Bufung for its detailed calculation. Really useful la..Eh sifu driftmeister, i saw the fuse put number 12? The possible rms is?

12A fuse ?

Yup, red color ones 12A fuse

(12*12V)/2=72W rms total power...

how accurate? god knows...

This post has been edited by craziechild: Dec 7 2006, 12:51 AM

look @ the fuse and guess the power.. sound senseless for me..

BuFung... theorically its correct...

practically too

use the price and brand reputation maybe? haha..
just save ur trouble....normally a cheap amp will use overrated fuse....
like a branded amp use 40A to provide 4x90 rms @ 12v, a chapalang amp can use 40A to provide only 4x40rms @ 12v.....

use fuse to calculate are determined by the amp circuit design....and other factor which i not sure wat is it...but there is some....

Icic, how can recommend any low entry amp? FYI. damaged amp can repair?

This post has been edited by nightzstar: Dec 8 2006, 08:06 PM

better state ur budget..to somebody, rm1k amp are low end amp.....
damaged amp can repair like other electronic...but depend on the damaga...
btw, a ddamaged amp can never repair to perform like ori....better or lousier...depend on luck

My budget ah 300 plus only

hehe.... RM 300 amp you use what to calculate also no use... cuz it will always be over overrated.... so jus buy the one tht can nicely power up your driver is enough lo...

cheers...

Erm any economic amp in that range of budget?

mayb can try kenwood or debezt...

how many channel do you need?