I did something about the poor sound in my Grenadier.
I have the two-seater which only has two speakers in the driver and passenger doors. I replace those with Hertz CK165 woofer and separate tweeter which I mounted on the A Pillar.
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Well, for a small investment I achieved a massive improvement in sound quality. Bass is improved and the high end is much, much better than the OEM speakers.
I also added 5" speakers in the rear doors, and these are easy to wire up as the Ineos wiring harness has the wires up to the B Pillar and all I needed to do was run some wires into the rear doors. I'm in the process of sourcing proper terminals to complete the installation. When next at a dealer, I'll ask them to enable the fader for the rear speakers, but they work without this. They don't make as much of a difference as the fronts but will improve the sound marginally for little cost.
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Some trimming to enlarge the front and rear apertures is required but with a Dremel, a relatively easy task.
Happy days.