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<blockquote data-quote="keep_hope_alive" data-source="post: 8169850" data-attributes="member: 576029">you need to first verify what the shop did for wiring.simply adjusting the fader and balance on your head unit will tell you what they combined on each input/output.&nbsp; what head unit do you have?did they use factory wiring for the speakers?&nbsp; where did they intercept them?what car make/model/year/trim?rear speakers are just for &quot;fill&quot; and should be MUCH quieter than front.&nbsp; in fact, you shouldn&#039;t even tell they are on from the front seat.&nbsp; for that reason, they can sometimes be ran from the head unit as long as they are the only &quot;rear&quot; channels used.&nbsp; this means the JL amp has to get it&#039;s signal from the front output of the HU (and possibly dedicated sub output if the HU is capable).you can wire front and rear in parallel but that is silly because you want the fronts louder.coaxial are typically 4 ohm.channels 1 and 2 of the amp will be stable to 2 ohms stereo so they can technically power front and rear, left and right.channels 3 and 4 of the amp will be stable to 4 ohm bridged so they can power a single sub easily.</blockquote>

[QUOTE="keep_hope_alive, post: 8169850, member: 576029"] you need to first verify what the shop did for wiring. simply adjusting the fader and balance on your head unit will tell you what they combined on each input/output. what head unit do you have? did they use factory wiring for the speakers? where did they intercept them? what car make/model/year/trim? rear speakers are just for "fill" and should be MUCH quieter than front. in fact, you shouldn't even tell they are on from the front seat. for that reason, they can sometimes be ran from the head unit as long as they are the only "rear" channels used. this means the JL amp has to get it's signal from the front output of the HU (and possibly dedicated sub output if the HU is capable). you can wire front and rear in parallel but that is silly because you want the fronts louder. coaxial are typically 4 ohm. channels 1 and 2 of the amp will be stable to 2 ohms stereo so they can technically power front and rear, left and right. channels 3 and 4 of the amp will be stable to 4 ohm bridged so they can power a single sub easily. [/QUOTE]

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