How to install an amp and sub in your car Crutchfield video

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“I m junior. We re here in our install bay and we are going to to install an amp and a sub in this mazda. Now the process is pretty the same in most cars. We re going to go over the basic steps.

What it takes to install an amp in a sub in this particular car. We ve got the factory stereo. So let me go over what we re going to do here first. We re going to use the power wire and the ground wire and stuff in here to run power from the battery.

The battery is under the hood in this car. We re going to run power wire from the battery through the firewall down the passenger side of the car. All the way into the back into the hatch area where we re going to install this we re going to run an equally sized wire to the ground. We re just ground that in the back of the car probably to like a seat bolt or something and then we ll run a little blue wire to this to turn the amp on and off with the radio.

We ll also need to get music into this amplifier and that comes in right here to these rca inputs in this particular car. We have a factory stereo. So we re going to need to convert the speaker wire coming out of the back of the factory stereo. Which will plug in right here on our line output converter this will change it over to our cas which come out the other side.

If we had an aftermarket stereo that stereo would have rca preamp outputs already on it that we could use you know connect rca cables directly from there run them to the back and plug them into the inputs on the amp since we don t that s why we need the line output converter to convert speaker wire into our cas. These are the rca cables that we re going to run from the line output converter to the amplifier and of course. We don t want to run our rca s right next to the power wire. That s a great way to get noise introduced into your system.

Which you do not want to get music from the stereo into this line output converter. We re going to use this speaker wire here and then to get music from the amplifier into our subwoofer. We re going to use this thicker heavier gauge. Speaker wire here because we got a lot more power.

We need thicker wire. And then lastly. We re going to run this little remote base knob. So that the driver can crank the bass or turn.


The bass down as the song dictates and we should have a pretty sweet little subsystem added to the factory stereo. It s going to sound pretty darn good alright. So the first thing we re going to do is disconnect the negative terminal from the battery. So that we don t shock anything or blow anything up it s ten millimeter socket.

Here. It s probably enough all right. I m going to tuck that away so it can t touch anything bad and the next things we re going to do is we re going to run this power wire. You can see it s got a nice power ring on it this is the positive terminal battery.

We re going to connect it right there between that nut and that stopper right there. So that s going to hold our power wire secure to the positive terminal of the battery. We re going to run this power wire up through here we re going to put it in some flex loom to keep it protected from the heat of the engine. We re going to install a fuse somewhere in this neighborhood right here that will keep our entire vehicle safe in case.

There s any kind of short in the power wire. All the way from the front of the car to the back of the car. We re going to run it over there to a this nice big huge grommet in the firewall where a lot of the factory wires go from the engine compartment through the firewall and into the passenger compartment. We re going to use this knife to poke a small hole in the rubber next to the wires making sure not to cut any of the wires of course.

And then we re going to poke this coat hanger through so that we can fish our wire through the grommet. So let s see here alright that should do i m going to take this coat hanger. And i ve already put a little hook on it the idea here is that once we get the coat hanger through and we find it on the other side behind the glove compartment. We re going to take this power ring just hook.

It on and pull it right back through that s the idea hopefully. It works out just that easily all right got the coat hanger through the hole. And i m pushing it through pretty much almost all the way so just there s still enough for me to grab on this side and pull it back once i ve got it connected to the power ring on the other side. So now we re going to go around to behind the glove compartment.

See if we can find our coat hanger. And that hook to hook. The wire on all right let s pull our wire through. Oh yeah.


Just like it s supposed to work all right so we ve pulled enough wire through to get over to the battery. And we also need to install a fuse holder. The amplifier wiring kit comes with a pretty nice fuse holder with the views installed. So we re going to have to cut this wire somewhere you want to do this pretty close to the battery.

The closer the battery. The better. We don t need it very long. See if these wire strippers will do the job sometimes they demo work on super thick wire.

Like this but they work pretty nicely on that one today all right so now install we re going to need an allen wrench tighten it on down example coming out all right power wire securely attached to the fuse holder. No extra strands of copper hanging out on either side. So a nice clean. Thing then we ll put the cap on it for now.

But we can just attach we re going to screw that right down into there and now we can go ahead and connect this to the battery. All right power wire is now securely attached to the battery. Got let me put our fuse holder right there just a little bit of slack. There and now we can install the flex loom and get this wire attached up here probably with some zip ties all right so we ve got the power wire through the firewall.

We ve taken care of it all under the hood. There now we just need to get it routed from behind the glove compartment down the door sills through the car. All the way to the back where we re going to actually install the amplifier. I m just going to lay the cable out along the route here we might have to pry these panels up and stuff or we might be able to just kind of tuck.

It under there. I am using a little tool to sort of help it get tucked under there. But so far. I haven t had to actually pry any panels out all right so we ve got our power wire run back here to where we re going to put the amp and the sub as you can see it s routed right back to here we re going to connect that right to the power connection on the amp.

That s the power side now we ve got to figure out where are we going to ground this amplifier. So we ve got a short little wire. We want to ground this to a good bolt that goes right into the chassis of the vehicle back here in the back now looks like the bolts and this surface are painted. We cannot have paint between the middle of our power ring and the the chassis ground so we re going to want to sand that off we re gonna use some sandpaper to sand the paint away so we ve got bare metal.


You really need a good ground any time you re installing anything into a car to complete the circuit and make sure you re not getting noise. So we ve sanded the painted surface down to bare metal. We ve sanded this bolt head down to bare metal. We should be able to go ahead and put our power ring on it and screw this back into the car and we will have our ground connection.

All right good and tight. We ve got our ground wire got right next to our power wire. We can go ahead and put the hunk of this hatchback back together all right so we ve finished the power and ground. Which is kind of on the other side of the car.

And that s kind of the first half or the big part of an amplifier installation is getting that power wire run from the front to the back and finding a good grounding point. We ve got all that done now we re going to work on getting the music from our factory stereo in this car into the amplifier. Which means we re going to take the dash apart for that i ll use the crutchfield mastersheet switch will show me how to get the dash apart. We ll get into the back of the radio where all the speaker wires are and we will tap into those wires so we can connect our line output converter and grab a copy of the music and send it out into the back to the amplifier all right so we ve got the factory stereo out we will set that to the side and we have revealed our wiring harness and we ve identified our speaker wires we re going to tap into those using these uh potty taps.

Which make connecting to factory wires like this much easier than actually like cutting and splicing into them all right so there s our four taps for the factory speaker wire. We ll get some aftermarket speaker wire. We ll get those attached to the other sides here the next thing i m going to do is to connect our power wire. We re going to use about a foot or so of this blue wire that came in the amplifier wiring kit its power and last some ground all right we ve got rear speaker wire positive and negative.

We ve got disconnected to the ground wire. We ve got disconnected to the power wire. We re going to run those wires just long enough to get to this line output converter. We ve found the space in the dash that should fit perfectly we ve even checked it to see so i m going to go ahead and start connecting them to these terminals on this lineup would convert all right now.

I ve got all those connections made we are ready to run the rca cables up through the dash here and you may notice. We ve got four rca connectors on this lineup of converter. There are actually four rca outputs. Now.

It is just a two channel lineup of converter. So and all we need for what we re installing today is this set of outputs right here the bass output. Because we re installing a subwoofer amplifier. This conveniently has an extra set of rca outputs which we re going to go ahead and run the cables for those in case.


The owner would like to install an amplifier later so we ve got our line output converter wedge nice and tight in the dash here and we ve got our rca s and our remote turn on wire. We started running them down through the dash right down here to buy feet and now i m going to get down and get underneath and start to run them on the side of the caller. All the way to the back alright. So we re going to run the rca s.

And the remote turn on wire down this side of the vehicle. We re also going to run the remote bass knob control wire right along with them some of us have it some don t sometimes. It s an option so this may or may not be a step you ll have to perform when you install your sub. An amp and so just like we did on the other side of the vehicle now we are tucking these wires up underneath.

These panels alright so we ve run our rca cables up the driver s side of the vehicle along with our remote turn on wire. And we re going to go ahead and connect everything up at the amplifier now because we ve got all these wires all back. Where we need them so we ll start with the rca wires. And these will just go right into the rca connections on the side of the amplifier on the other side is where our power and ground and speaker wires all connect so we ll start with the power wire that first wire that we ran go ahead and strip.

It up with an allen wrench. So that we can use that to tighten down these wires and our power wire. Let s do our ground wire next alright and last. But not least our blue remote turn on wire all right so all those are connected good and clean and solid.

So all that s left now is to connect our speaker wire from the amp to the sub and i ve got some speaker wire right here i m gonna go ahead and strip the wire speaker wire securely connected to the amplifier all right we are hooked up we are ready to reconnect the negative cable on our battery and just to recap we ran power wire from the battery over on the passenger side of the vehicle. All the way back to this amplifier back here we grounded to a seat bolt right here back by the amplifier and then we grabbed speaker wire signal from the factory radio in the dash connected that to a line output converter right behind the radio and we ran rca cables and our blue remote turn on wire from behind the radio down. The driver side of the vehicle right back here to our amplifier. Where we ve got all of that connected with some big thick speaker wire going from the amplifier to the subwoofer to make bass and now this car is actually going to sound decent factory radio with it so there s a great enhancement so if you need any help picking out an amp and a sub or any combination thereof check out crutchfield give us a call.

We can certainly help you get the right stuff. And of course. We can help you get it ” ..


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