How to check the RMS of the amp? And wat do we define the RMS? i remember i read those thing but it too complicated read until ..>Any sifus Ice here got easier guide for noob like me to understand?

RMS = Root Mean Square.. Mathematics..

But basically it mean the Average Wattage ur amplifier can do in long term/long time...

not the peak wattage or what rubbish PMPO wattage.. an amp can have a peak of 2000W but it will only have RMS 500W or below.. peak wattage mean the peak the amp can do in very short time.. say maybe 1ms...

normally u see those amp say have 2000W.. 3000w max.. all is rubbish rating...


But.. RMS wattage also different when the impedance is different.. say.. an amp have 200W RMS in 4 Ohms.. it may only have 100W in 8 ohms.. but car ICE equipment are normally 4 ohms...

Icic..thanks BuFung for clearing my doubt.How do we check the RMS of an amp or does it stated on the amp body itself or the manual. The standard RMS of amp for ICE is usually 200W at 4 ohm?

see the fuse rating

Icic..Thanks driftmeister.Oh yeah..I want to ask wat the use double voice coil featured on the woofer? And oso in wat situation does i nid crossover? If i got one set 6"1/2 2 way speaker and a pair of tweeter, i nid crossover? Sorry if i ask too much Hope all sifus Ice here can help

Hello any sifus can answer this question pls?

DVC is just to squeeze more to power in powering the subs..no difference in sounding compare to SVC
wat situation.. if u r going for full active setting ..then u will need an active crossover.otherwise hu or amp crossover is adequate
2 way means coaxial ? it shud hav built in passive x-over

Since this topic is talking about RMS....l got some issue here as well.

As l know, Myvi original player output is 25w x4 RMS.

If l change the front and rear speaker to
Front - 2 way 4inch with 30 watts rated power and 90 watts peak power.
Rear- 2 way 6.5inch with 40 watts rated power and 120 watts peak power.

Do l need a amp to power these speaker? Is the original player enough to pump it?

Sorry...l,m noob in RMS calculation.

This post has been edited by daniel31: Apr 22 2006, 05:43 PM

how u know ur hu is giving 25w rms ?
stated ker?

Yeah..reading from the car manual.

Oh....coz l got 1 spare 4 channel amp. if the original Hu can power those speakers, l might save up my amp.

This post has been edited by daniel31: Apr 22 2006, 06:25 PM

but HU's THD is usually more than amp's THD

normally now a day HU have 20-25W RMS.. although they state in front of the panel said 45W.. that is the programme W...

of course.. THD for HU.. so many things built into one.. the THD is greater...

@deniel.. as what u state.. ur HU are able to drive the spk.. but it won't drive the full potential of the speaker...

prefer the amp power greater than the spk can take.. u can always control the amp not to over blast the spk.. but when u have not enough power of ur amp.. u will tend to open the amp to higher that it can do.. going up to the higher limit of the amp, this is when THD come into play... u heard rubbish sound ( I hate it.. so I call it subbish sound) from ur amp...


in a better amp design.. say an amp can do 100w @ 10% of THD.. they will limit the amp to do up to say 80w.. to have lower THD.. say it will only have 0.1% THD...

Imagine u have 10% of distortion of a CD u playing.. those are.. unacceptable...

in consumer.. like those Hi-Fi Combo u can buy, always have very high THD.. say like 10%... when u open > 1/2 of it volume.. u don't want to listen to it...

Erm...what is THD actually? l think l,m a little bit lost.

THD = Total Harmonic Distortion..

for short.. it is Distortion..

U don't need to know what exactly is THD.. u just need to know.. it is distortion...

Coaxial is for door rite. Mine is a pair 6 1/2" mid bass for rear and pair of tweeter for front. Tat mean i got built in crossover?

as far as i know coaxial speaker means a speaker which produces the high freq sound (sharp sound) and low freq sound (bass) together on one speaker,

and a coaxial setup means having the mid-bass speaker and the tweeter set together.

Crossover
A device intended to separate the different frequency bands and redirect them to different components.

THD Total Harmonic Distortion
A component specification which describes its ability to accurately reproduce a signal. Although lower numbers are considered to be better, the human ear typically cannot detect THD ratings below 2% or 3%.



This post has been edited by Cola: Apr 24 2006, 02:54 AM

Icic....the example for coaxial juz like the 6x9 speaker?

this is an example of 2-way 6" components.



component speakers consists of a pair of mid-range/mid-bass, tweeters and passive crossover. 2-way meaning the tweeters and the mids. 2 diff sound levels senang cerita. the crossovers function is to seperatre the audio frequencies and distribute it to the correct speaker.

n this is 3-way 6x9



notice the oval shape? thats the 6x9. as for the 3-way, its explained in the pic.

n this is coaxial speakers


take note that coaxials are almost always round. not oval. they could range from 2-way up to 4-way (max ive seen). coaxials usually consist of the midbass and the tweeter built into one cone. tweeters are built into the speaker....sumthin like the 6x9, only its round...it DOES NOT come with a crossover. what u see in the pic is what u get when u buy coaxials.

Oic mine is separated ones. One pair of tweeter and one pair of mid bass 6 1/2".....Tat mean i nid crossover yeah. And thanks to madman for his detailed explanantion .. Now i get the clear meaning

This post has been edited by nightzstar: Apr 25 2006, 03:35 PM

mADmAN , excellent explanation.

nightzster, usually a crossover is provided when u buy in one complete set tweeter and mid bass.

Unless you buy seperately tweeter and mid-bass, there's no crossover

i think u can't buy a seperate stand alone crossover, but there's one device called electronic crossover might be useful.