Multi Channel
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What is the difference between monoblock, 2 channel, 4 channel, and multi channel amps?
im about to buy a complete sounds package for my car, with 6.9s and everything. am i right in thinking 6x9s are a substitute for mids and tweets? in my head i was going to connect the head unit to my amp and then all the speakers, 6x9s and subs to the amp..am i doing it right? i haven't got a clue about the different kinds of amps, do they all have inbuilt crossovers? i know crossovers are almost essential if you really wanna send the low frequencies to ur subs..and could you also help about the 2ohm and 4ohm and bridge thing, i havent got a clue what they mean or which is better in the long run or short term lol
many thanks in advance for your help!! 
mono amp (1 channel) - it refers to an amplifier with only one output.
2 ch amp - now the amp have 2 outputs : left and right
4 ch amp - it has 4 channels: front left, front right, rear left and rear right.
Usually you connect 1 speaker to 1 channel for better sound quality, but the number of speakers connected to a single channel will depend on the power and the impedance.
impedance - is a number to measure the Resistance to current of the coil.The numbers fluctuates between 1, 2, 4 or 8 ohms. Amplifiers always has a minimum impedance allowed most are 2 ohms, but a few ones are capable of running @ 1 ohm. You can change the resulting impedance at the output of the amplifier. To lower the impedance use parallel connection and to raise the impedance use series. while lower the impedance higher the power, less the sound quality. Is recommended to use 4 ohms connection to front speakers and 2 ohms to subs.
Many actual amplifiers have built-in in crossover so there's no need into buying one. The crossover is used to tune the desired frequency to the speakers. For example low frequencies are used to subs, and high freq. to front speakers.
Bridging is simply a way to connect the positive of one channel with the negative of the second channel, this doubles the power supplied, but are capable of running at very low impedance's.
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