Finished the installation of sub woofer in Morton, my Roadster. Whilst hooking up to radio for testing was a doddle and proved its worth, installing it in the top of passenger footwell was some journey, but now thankfully fully installed as below. Still it kept me off the mince pies and my back now has time to recover. Note picture taken looking up from floor and is completely hidden from above.

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Although it fitted near perfectly in the upper footwell space the non level undersurface, being the passenger side of the bulkhead, was littered with protruding bolt threads. Several could be shortened by fitting shorter bolts but nuts still protruded a little. The heater box mounting bolts are captive so the ends were cut as short as possible with a Dremel tool. A 10mm thick piece of self adhesive neoprene was stuck to the underside of the sub woofer, actually the top as it was installed inverted from its under seat design. This took account of the remaining bulkhead protrusions. A support bracket was fabricated from a length of 50 x 25mm aluminium angle with a cutout to accomodate the curvature of main bass speaker and bolted through the bulkhead that forms the end of footwell. Cabling was hidden by routing it behind lightly glued top edges of carpet such that it appeared close to upper door hinges. A further two brackets were fabricated from 30 x 3mm strip to support front edges of sub woofer, bolted to back of bulkhead which is also not vertical hence need for bend. Great care was taken when drilling holes to avoid existing cables.

The unit fits snugly resting on front bracket with the thick neoprene ensuring it can't move vertically and the two brackets at the front hold unit firmly in place attached to same with self tapping screws into 10mm thick wooden casing.

Panicked when first testing in-situ as virtually no bass from unit. Great relief though when a slide switch was operated that brings into play a low pass filter. Must have been damp in the contacts whilst left in my cold garage. Now all working perfectly hooked up to my Sony Bluetooth DAB/FM radio with full control via Sony app on my phone.