Hi - I just got this MKS after 3 happy yrs with a 2012 SHO. I love the car, it's great - a lot like the SHO in every respect, but with definitely nicer interior materials, and the other differences we all know about. I have to admit I was hoping for more out of the THX II audio though. It's good, but other than greater detail, and lower bass extension, I think the Sony in the SHO sounded better. More dynamic - ballsier if you like. Drums hit harder, guitars rang out a bit more. That said, I'm wondering if there are any gain adjustments on the THX system amp. Did I read somewhere it's a Pioneer unit? I suspect there will be nothing to twist, but I thought I'd check. I had a 2004 Pontiac GTO that had a so-so Blaupunkt stereo with a 6x9" "sub" in the parcel shelf. It had it's own small mono amp, which actually had a single unmarked knob on it - turned out it was a gain adjustment, which helped me get that system to tolerable level.
It's not that I hate the THX system - just looking to liven it up a bit.
Failing that, has anyone had success simply switching out speakers? I think it's classic Ford 6x8 in front and rear doors, 2.5" and 0.75" in the dash, 1" in the a-pillars, more 2.5" and the sub in the parcel shelf? I'm thinking maybe just switch out the door speakers if I can find something that's proven to provide a bit more punch. If not, I'm ok as is.