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Message: <blockquote data-quote="cacin" data-source="post: 2468407" data-attributes="member: 10222">If you still want the direct sub control (from HU), connect the HU RCA sub out to your sub amp. The amp to power rear comp should be connected to the HU rear RCA out. Depends on the power ratings of the sub and comp you're buying. Look at RMS ratings when buying speakers, subs and amps.I wouldn't say it's a hard time. It gives you more option to change the cutoff frequency. If you run passive, sound not nice , then cannot tune or minimal tuning of crossover side only. Like I said, the term pre-amp has been used wrongly. Pre-amp = anything between HU and AMP. E-xover is also considerd pre-amp. What you're referring to is graphic equalizer. An equalizer let's you do further adjustment to your sound. A good one should be around RM5xx plus? You can install step by step. Depends what your budget allows. If you want to wait also can. Once got the funds, can do one shot install and tuning. I do not have the knowledge to answer the rest of the question.The HU manual or the manufacturer website will write down the spec. You can tell from there. I think the Pioneer P80 and those high end Alpine units have built in e-crossover. Even the Kenwood KDC-X5729 have a basic crossover (front & rear HP, Sub LP). One of the reason for a 3 pair RCA out HU is, you'll have front, rear and sub pre-out. Depends on your setup and plans, you can really go beserk by having front 3-way, rear 3-way and a sub rca to sub processor. The other reason for a sub RCA out HU is so that you can still use the fader and the sub does not 'dissappear' when you turn the fader all the way to the front.Example system: 3 rca pre out (front, rear, sub) or 2 rca out (front, sub) Front RCA to Front amp and comps. Rear speaker out to rear speakers (as rear fill only). Sub RCA to sub amp. When I set the fader to Front 12, the sound from rear can be heard in front, but really soft. The sub still pounds as hard.If your HU only have 2 rca out which is only front and rear,Front to amp and comps, rear to sub amp and sub. Once you play with the fader setting to play more to front, the sub can't hardly be heard.if you only have 1 rca out connect to e-xover, you'll lose fader control. Once you change the fader to all the way to the rear, no sound would probably come out.There's a lot of possible setup. It depends on what you want and what hardware you already have.</blockquote>

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