Active Subwoofer using aux cable. Does it exist?

[SultanOfSwing]

I'm after a bit of a fuller sound in my car. I have a standard head unit that I dont want to change, and I use a Huawei tablet as my actual head unit. Sound is transferred from tablet via bluetooth, to a bluetooth module that runs off the aux in to my standard head unit.

Is it possible, to stick an 'active sub' somewhere, and use the aux cable to throw the sound through it? With some sort of low frequency filter thingymajig?

I'm out of touch with car audio, so understand this might not be possible.

[essayer]

Will it actually output sound from the headphone jack when it’s playing via Bluetooth?
If it does, I suspect there’ll be a small but slightly irritating delay between the two paths

Line level inputs from the car’s rear speaker cables into a dedicated 2+1 amp might be a better option

[51mes]

You can get underseat active subs - that work of aux outputs on your bluetooth unit (line outputs not headphone jack from the tablet)- and have a settable crossover. They also can take a high level output from the speaker wires...

this one for example on amazon: https://www.amazon.co.uk/Kenwood-KSC-PSW8-Compact-...

Had something like this many moons ago on my old Alfa 156...

There are plenty of other options.

S.

[Garemberg]

I picked up a second hand Pioneer TS-WX130EA and fiitted to my C1 , fits under the seat it's really rather good.