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<blockquote data-quote="Lasherž" data-source="post: 8711655" data-attributes="member: 679555">You&#039;ll want a Line out converter to interface between the car and the 3150c, even if your system is so low power that it can be within 8v (it will be very close if those speakers are 4ohms) even if it&#039;s only producing 15W per channel. √(15Wx4ohms)=7.75VThe main reason you&#039;ll want an LOC is because your car very likely doesn&#039;t send the same EQ to your speakers at high volumes. Newer cars like that focus will adjust the bass range downward so that the head unit and the speakers won&#039;t be damaged. The way around this is to get an active LOC (never buy a passive one, they&#039;re trash) like the AudioControl LC2i, which can amplify the bass signal back up to what it should be before the car&#039;s head unit toned it down. Also that LOC can produce up to 9.5V preouts which is enormous, you&#039;ll have no signal integrity loss at all with it.Importantly before you do this you need to do a tone test on your system. Play a 50hz test tone over the speakers in your car and use the fader to adjust between the front and the back. Don&#039;t tap any speakers that can&#039;t play that note audibly. On my car the rears don&#039;t play it at all so tapping them would be a mistake but the front ones play it loud and clear so they&#039;d make a great candidate for tapping an LOC into.</blockquote>

[QUOTE="Lasherž, post: 8711655, member: 679555"] You'll want a Line out converter to interface between the car and the 3150c, even if your system is so low power that it can be within 8v (it will be very close if those speakers are 4ohms) even if it's only producing 15W per channel. √(15Wx4ohms)=7.75V The main reason you'll want an LOC is because your car very likely doesn't send the same EQ to your speakers at high volumes. Newer cars like that focus will adjust the bass range downward so that the head unit and the speakers won't be damaged. The way around this is to get an active LOC (never buy a passive one, they're trash) like the AudioControl LC2i, which can amplify the bass signal back up to what it should be before the car's head unit toned it down. Also that LOC can produce up to 9.5V preouts which is enormous, you'll have no signal integrity loss at all with it. Importantly before you do this you need to do a tone test on your system. Play a 50hz test tone over the speakers in your car and use the fader to adjust between the front and the back. Don't tap any speakers that can't play that note audibly. On my car the rears don't play it at all so tapping them would be a mistake but the front ones play it loud and clear so they'd make a great candidate for tapping an LOC into. [/QUOTE]

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