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<blockquote data-quote="DarkScorpion" data-source="post: 6674998" data-attributes="member: 618537">Well, when doing an active set up, you&#039;ve REALLY got to take your time reading and researching. In a nut shell, an active set up is this: a set up which allows you to actively control the crossover frequencies and slope of all your speakers so you can fine tune your system. Many Active setups also allow you to control time delay, so you can basically tune your set up to account for all the structural deficiencies of installing hi-fi speakers in a car. The reason you need a 4-channel amplifier or 2 2-channel amplifiers is becuase each speaker will get it&#039;s own channel on the amplifier.Say you have a four channel amp - in an active set up, each channel on the amp will power a single speaker - 2 woofers and 2 tweeters. You will NOT be using the passive crossovers that are provided with your component speakers. Your head unit/processor will control all the settings and tuning. On your headunit/processor, it&#039;s common to see these RCA outputs: Left front, right front, left rear, right rear. In the case of an active set up, these will actually serve as: left woofer, right roofer, left tweeter, right tweeter. These outputs will go to the amp which will go to all 4 speakers. If you haven&#039;t figured it out, that means you can control all 4 individual speakers in an active 2-way set up!There are is quite a good selection of active-capable headunits on the market right now. I&#039;ll give you a few to look into in a bit, I need to look up model numbers and such, but it&#039;s only the tip of the iceberg.</blockquote>

[QUOTE="DarkScorpion, post: 6674998, member: 618537"] Well, when doing an active set up, you've REALLY got to take your time reading and researching. In a nut shell, an active set up is this: a set up which allows you to actively control the crossover frequencies and slope of all your speakers so you can fine tune your system. Many Active setups also allow you to control time delay, so you can basically tune your set up to account for all the structural deficiencies of installing hi-fi speakers in a car. The reason you need a 4-channel amplifier or 2 2-channel amplifiers is becuase each speaker will get it's own channel on the amplifier. Say you have a four channel amp - in an active set up, each channel on the amp will power a single speaker - 2 woofers and 2 tweeters. You will NOT be using the passive crossovers that are provided with your component speakers. Your head unit/processor will control all the settings and tuning. On your headunit/processor, it's common to see these RCA outputs: Left front, right front, left rear, right rear. In the case of an active set up, these will actually serve as: left woofer, right roofer, left tweeter, right tweeter. These outputs will go to the amp which will go to all 4 speakers. If you haven't figured it out, that means you can control all 4 individual speakers in an active 2-way set up! There are is quite a good selection of active-capable headunits on the market right now. I'll give you a few to look into in a bit, I need to look up model numbers and such, but it's only the tip of the iceberg. [/QUOTE]

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