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<blockquote data-quote="starkfu" data-source="post: 3237514" data-attributes="member: 579412">seriously,If you still hook up the 4&quot; in the door you run the risk of unbalancing the stage in your car.Here are the inherint problems:1.&nbsp; you would have to parallel the rear channel, so two sets of wires would come off of the amp&#039;s rear outputs, one would go to the 4&quot; in the door, the other to the crossovers for the rear deck.&nbsp; The problem here is that your 6.5&#039;s will handle more power then the 4&quot;, but you won&#039;t be able to give it to them as the 4&quot; speakers become the delimiter, as some might see this as a good thing, and rightfully so, it isn&#039;t.&nbsp; All adjustments should be made from equal amp gains - especially on the alpine theater amp.&nbsp; to set a proper sound stage, everything should be receiving equal power and allowed adjustability at the head unit.2.&nbsp; Having a paralleled rear output is going to make the amp work harder and increase wattage loss in heat, it will also degradate the quality of amplifier output.3.&nbsp; The sound from the 4&quot; could affect the sound waves coming from the rear deck, now I know this is being nitpicky, but the 4&quot; have no chance of being correctly aimed to properly compliment the 6.5&#039;s in the rear deck and will most likely cause a negating effect such as echoing or wave cancellation at 90 degrees phase imbalance.&nbsp; Not to mention that the sound will be absorbed by the front seats.4.&nbsp; Even if you decided to parallel them off of the front speakers, now you just lost all of your front / rear stage capability as front sound will be coming from behind you.It must be said that I am all about sound quality and don&#039;t see any advantage to having them, unless you had them up front to balance the stage with hardware, but then you are looking at running a third amplifier just to power the 4&quot; speakers.Final thought - don&#039;t do it, save your money and buy the quality stuff that is going to give you the best sound.</blockquote>

[QUOTE="starkfu, post: 3237514, member: 579412"] seriously, If you still hook up the 4" in the door you run the risk of unbalancing the stage in your car. Here are the inherint problems: 1. you would have to parallel the rear channel, so two sets of wires would come off of the amp's rear outputs, one would go to the 4" in the door, the other to the crossovers for the rear deck. The problem here is that your 6.5's will handle more power then the 4", but you won't be able to give it to them as the 4" speakers become the delimiter, as some might see this as a good thing, and rightfully so, it isn't. All adjustments should be made from equal amp gains - especially on the alpine theater amp. to set a proper sound stage, everything should be receiving equal power and allowed adjustability at the head unit. 2. Having a paralleled rear output is going to make the amp work harder and increase wattage loss in heat, it will also degradate the quality of amplifier output. 3. The sound from the 4" could affect the sound waves coming from the rear deck, now I know this is being nitpicky, but the 4" have no chance of being correctly aimed to properly compliment the 6.5's in the rear deck and will most likely cause a negating effect such as echoing or wave cancellation at 90 degrees phase imbalance. Not to mention that the sound will be absorbed by the front seats. 4. Even if you decided to parallel them off of the front speakers, now you just lost all of your front / rear stage capability as front sound will be coming from behind you. It must be said that I am all about sound quality and don't see any advantage to having them, unless you had them up front to balance the stage with hardware, but then you are looking at running a third amplifier just to power the 4" speakers. Final thought - don't do it, save your money and buy the quality stuff that is going to give you the best sound. [/QUOTE]

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