Which stereo ports do I have? (Subwoofer install)

[Frosty]

Hi

I am looking to install a subwoofer in my caddy -23. Haven't built car audio before so it's a learning experience. Was wondering if there is a way of knowing what ports I have in the factory stereo to connect a subwoofer without taking it out and having a look. It'll be one of those slim under-seat types. It doesn't need to win any competitions, just give some oomph.

Thanks.

[Doc]

Welcome to the forum.

You won't have a conventional "Sub-Out" on your factory head unit so you will need to use a speaker level input into whatever amplifier you use.
There are lots of amplifiers with speaker level input available so you should have a choice across many brands.

[Frosty]

As I understand it, the sub has a built in amp. So I run speaker cables from a speaker channel out, into the amp in the sub? Does it matter which channel out?

Thanks.

[Doc]

If the amplifier is capable of running a speaker level input, then yes.
Depending on the unit in your caddy, you may have the option to use a rear speaker output (if unused) which will give you some control over the subwoofer as you can fade front to rear to balance the level.

[Frosty]

Ok thanks. It's a 2-seater so no rear speakers, should be perfect. Also, will the remote control work when connecting in this way, or does it only work with low-level?

https://www.biltema.se/bil---mc/bilster ... 2000043331

[Doc]

I should think the remote will work with either input to the amplifier, I don't understand the language of the manual to say for sure so you might want to check with the supplier or manufacturer.

[Nicklouse]

Biltema my favorite shop when I lived in Sweden. Looks like it has both both high and low inputs. Your head unit will have a sticker on it showing the outlets. I would get some pins and add them to the quad lock connector if original and run wires from them.

Which head unit is it?

[Frosty]

Ok thanks to both of you. Yeah they have a lot of useful stuff. Easy to over-spend in there I can't find info on the model number of the head unit anywhere, but I can take a picture later. It's the one with touchscreen without buttons.

[Frosty]

https://www.dropbox.com/scl/fi/cxcfueic ... dwdrp&dl=0