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Installing An Active Sub

Fitting an active sub is very easy, a handful o connections and you are done

Modification Details




Wiring An Active Sub

Active subs have the amplifier built in so you have less connections to worry about.
Here is a very typical layout. You will have ground, switched live, permanent live and an audio input.

The audio inputs may be either or both high or low level. High level inputs connect to your speaker outputs, low level inputs connect to similar low level outputs on the rear of most aftermarket stereos. The standard smart stereos do not have low level outputs.

You may also have a wired remote connection.



OK, One At A Time

Ground, also called earth. Symbolised by GND.



Connect this terminal to a ground point in the car. There are several around the car.
They will be a stud with other wires connected to them. Remove the nut, fit the ground cable
to it and replace and tighten the nut. Attach the other end to the GND connection on the sub.

It is a good idea to cut this cable down so you don't have excessive cable.
Having too much cable can increase the amount of interference that the sub picks up.



The next connection is REM, also called remote. It is a switched live cable (usually blue) that turns the amp on. Do NOT connect this straight to the battery or it will flatten it when the car is off.



The switched live connection can be picked up from the cigarette lighter socket or the switched live
auxiliary connections on the side of the SAM unit. Ideally you should use a SAM fuse holder but as
it only uses a very low amperage I usually crimp a spade connector on the cable and push it in.



Permanent Live, also shown as +12V.



Your active sub should come with the correct wiring kit. The permanent live cable will probably
be yellow but could also be red. Chances are it will have a ring terminal on the end of it.
If for some reason it doesn't you will have to crimp a ring terminal in place.

Attach the sub end of the wire first.



Expose the battery and locate the positive terminal.



Remove the nut, put your live cable over the stud and refit the nut tightly.



High Level In, also known as high power input.



The standard smart stereos will require you to use the high level inputs as they do not
come as standard with low lovel outputs. In this instance you have CH1- & CH1+ on the left
and CH2- & CH2+ on the right. Some active subs will be labelled L- & L+ and R- & R+.

Remove the stereo and find the speaker wires, determine the left + & - and the right + and - wires.
Splice into the existing wires with the wires going to the sub.

You are now good to go, start the car and have a listen.

Other Connections

If you have an aftermarket stereo with low level outputs and have low level inputs
on your active sub, you just have to join them with a suitable length RCA cable.

If your active sub has a wired remote control it usually just plugs straight into the sub.

Types Of Active Sub

Here is a list of under-seat (compact) subs.

Best Place To Put Them?

Under or behind the seat is the most popular as they don't take up much room.
However, some are too big and can either be placed in the passenger footwell or, in the instance
below, in the boot (trunk). Velcro (hook) tape is usually strong enough to hold them in place.



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