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Message: <blockquote data-quote="kyheng" data-source="post: 1254469" data-attributes="member: 13624">Should tell our friend from begining(HU till sub) and keep his mouth shut, haha.HUmost of the HU now speaker output power is around 18-25w rms, with minimum 1 RCA pre-out with power of 2.2V(Pioneer) to 8V(Eclispe)For a higher output RCA pre-out power voltage, sure the price will be higher, the price range for a HU is from 300 till 2-3kSpeakersIs used for producing voice and music.4"-5.5" is more for vocal only, lack of midbass.6.5" is best for midbass, but lack of vocal, so some it is best to match with a pair of tweeter. That's why it comes out the so-called component set. Like Oldskolboyz said about the 2 way or 3 way. Whatever it is , it will have a pair of tweeter. This is only applied to middle or lower range brand only, that one higher end one I don't how they perform.Sub / wooferIs used for bass or drum sound, best for techno, trance, rock and other modern songs.It have either single voil coil(SVC) or dual voive coil(DVC).SVC is it only have 1 voice coil for the sub and normally will be at 4ohm or 8ohm.DVC is it have 2 voice coil for the sub and normally will be at 2ohm, 4ohm or 8ohm. The ohm will be changed depend on how we wire it.Basically a DVC sub perform better than a SVC sub, but sure the cost for a DVC will be higher. Pre-amps / equalizersUsed for fine tuning yours songs from front, normall installed below HU. Some people said that pre-amp is useless, but when the HU only have 1 pre-out, then it is usefull in some sence. It can be used to adjust your treble, mid, bass for you speakers, and sub's volume also.Crossovers : passive or eletronicEletronic crossover : Similar to pre-amp, only it have more knob to tune your songs. Only the down part is it only can adjust on below car seat, can adjust for band-pass, run your system active and so on.Passive crossover : a static crossover that consist of coil(low pass filter), capacitor(high pass filter) and resistor. Normally you will see it on a component set. Can build a simple passive crossover also, for tweeter use a capacitor to reduce the bass that goes into the tweeter and coil to reduce treble goes into the midbass speaker. For this, alot of research to be done in order to get a good match, else will end up like tweeter pitch too high or midbass no bass.Storage capacitorTo be use when ICE total system RMS is more than 500watts. But some people never use it even the total power is more than 500.AmpsGot few class : class A, B, AB, Dclass A, B or AB the effiency is low, normally around 40-50%, not like class D, around 80-90%Class A, B or AB is the normal 2 or 4 channel amps that is in the market now with price range from 100-10k and used for power the speakers. Can be bridged to power a sub. Can call it a stereo amp. Normally is 4ohm and can goto 2ohm.Class D is used mainly for sub only and normally people call it monoblock amp. It can used in 4ohm,2ohm or even 1ohm. If that amp can go down to 1 ohm, the price will be very high. Price range is from 1k and above.1ch amp : monoblock amp for sub2ch, 4ch amp : amp for speakers, bridged for sub5ch amp : 4 ch for speakers, 1ch for sub</blockquote>

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