Also very curious about simple yet effective audio improvements to the 215 watt system. I have a Sport trim. I wonder how much simply upgrading the door speakers would improve sound quality? I think soundstaging really comes from the additional center speakers in the touring/elite (plus adequate power for the sub), but some better 6'' drivers in even just the the front doors could be a cheap and worthwhile upgrade. Speaker quality can make a noticeable difference. I have to also mention that the 540 watt power amp has way more headroom than the 215 watt and is probably capable of producing better/fuller sound at lower volume, but I'm not positive about this.I looked up the part numbers for the touring and the EX-L speakers, amps, subwoofers and headunits. The touring has Panasonic components, that includes a 540w amp. The EX-L has pioneer components and a 240W amp. Without looking at the wiring harnesses it is impossible to know if this can be donde by swapping out parts only. The cost of the head unit is 1700, the amp is 500, the subwoofer is 130, the door speakers and tweeters are cheap. The more I think about this the harder it looks. I searched the Pilot forums and some have gone aftermarket, but then they create another problem by messing up the active noise cancelling (ANC) so that opens another can of worms. It has to be disabled. I may have to settle with what I have.
Overall the audio quality is really not terrible, and it is an upgrade from my 2007 Trailblazer (although while much more articulate, is it a bit more harsh/fatiguing to listen to). There's something just a little off about it, like they tried to create the illusion of better sound by emphasizing treble/punchiness maybe some compression(?), but the sound is not necessarily full, wide, and pleasing to listen to. Loudness is not an issue for me, its plenty loud when turned up, however, soundstage is pretty weak, and I find at low volumes it loses all fullness and becomes very trebly and thin with sibilance from the tweeters becoming annoying. I wish I could leave it a lower volume when having conversations in the car without such a hit to sound quality. Its like you turn it down to talk, but then the treble all remains and cuts through your conversation
The 5'' display offers bass and treble controls only, and a subwoofer control that doesn't really do anything. I feel the sub must be quite underpowered, it becomes slightly noticeable at higher volumes but doesn't really thump. I think with a better EQ i would be happier. The bass control on the display really turns up low-mids, not true bass, which sounds laughably terrible if pushed anywhere past center.
If you do any upgrade please post back here - it is something I plan to do eventually, but its a little ways down my list on vehicle mods for now. I will also do more research and post back here I find anything worthwhile.