ScoobyDoo said:
My car is a lease, that was already built. I would like to add a Sub, but mindful that it's not really 'my car' so wouldn't want it to be to intrusive - plug and play would be ideal... but I guess that depends on what the head unit supports.
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A tip for anyone who wishes to do something like this but not cut in to the wiring (i.e. keep car original and all warranties intact).
Companies like Autoleads make ISO adaptors - the intention is so that you can connect the car's wiring harness to a 3rd party head unit. Of course they also make adaptors so you can connect your existing head unit to an ISO system.
What you really want to do is buy both. At the moment you have your cars wiring system connected to the SEAT head unit. The goal is to extend that wiring loom and using the newly created extension for cutting in to the loom.
1: Remove the connector at the rear of the head unit.
2: Attach a connector which converts the head unit connections to std ISO
3: Attach a connector which converts the wiring loom connections to std ISO
4: connect both std ISO's together.
So in effect you've just extended the wiring loom. You can then cut the wires on the extension to your heart's content without the need to cut in to the harness - simply extend the speaker wires to the speaker inputs on your amplifier and connect the speaker outputs from your amp back in to the extension.
It's a fiddly way of installing a system and if you're not careful with the routing of the speaker wires, can create interference, but what it does do is enable you to keep the original headunit + all the original wiring. You can then have more power going to the original speakers (that in itself will improve the sound) and/or feed a sub box.
If you can't find the correct adaptors then you can make an extension up yourself - but this requires a bit of skill. I did this last on a BMW - couldn't find the correct cables so simply purchased an adaptor for a parrot phone system, ditched all the wiring and just used the plug - total cost under ÂŁ5.
Improving the sound for under ÂŁ300 is easy peasy as long as you don't have to rely on others doing it for you.