[Guest]

Anyone fitted one of these at all? It looks pretty decent as every review has said!

In Phase USW10 Ultra Compact Active Subwoofer - USW10 from In Phase

 

[Guest]

Fitted the Blaupunkt version to the Brera.
It was a good updgrade for teh money/effort required.

Not sure the 159 needs it as the standard rear woofers
are adequate for my ear.

There is a cut-out in the parcel shelf for the bose install...

 

[AwB]

I recommend also looking at the Focal BUS series. I have a BUS 25 fitted in the boot, on back of the drivers-side rear seat, in the Brera. Very compact. Sound is tight and gets down lower than the fronts could ever, without being too boomy.

If you're headunit or set up allows, installing one of these (In Phase, Blaupunkt, Focal, etc) lets you high-pass the rest of the system, cleaning the overall sound.