Im looking to instal a small sub into my golf and plug it into the factory head unit, I only want something very small to provide extra bass. I have recently been in a mates Audi A3 with Bose sound system which has a small 40watt sub which provides a decent amount of bass. I want to install something similar into my car, im looking for any information that may help me and recomendations. I have seen options that fit under a seat or can be hidden away such as the Pioneer TS-WX210A although it seems quite expensive, prehaps a similar option? I would also concider building an enclosure to fit into the side of the boot if this is a more cost effect method.
Any info/help would be great
Cheers