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Yes, it is under there for me. The LR rep was wrong.it's under the passenger front seat.
Hey Guys, I'm a little late to the party, but I've been doing a lot of research on this subject. FYI, I too have a 2010 LR4.
I never realized the amp was different in the 12-13' models, but it makes sense. In theory, the infotainment system shouldn't realize there's any real difference in power output as all it's doing is sending low level optical data to the amp....which then just pushes the speakers. The big question is whether the 2010 speakers can handle the extra power?
I also found this link which might be of some help for those looking to upgrade the sub or other speakers in their LR4's:
https://www.landroverworld.org/threads/lr4-logic7-sound-upgrade.29931/
Basically, it looks like Mobridge may sell a fiber optic receiver that can intercept and decode the LR signal for an aftermarket amp. The JL sub looks cool too, but it sounds like they discontinued it pretty quickly. Other than that, dynamat and an aftermarket sub and it should help a little! Also, I do know that several companies make speaker level converters is the Mobridge route doesn't play out. That way, you can just intercept the signal post-amp and send it to another amp and speakers. It's just a thought.
Rather than going through the full Logic 7 upgrade (for those who didn't get one to begin with), if there is a way to utilize the stock head unit via something like a Mobridge decoder or a speaker level converter, I feel like it'll be cheaper, and possibly cost less in the long run.
Just my $.02.
Fyi, I'm totally going to try the 825W upgrade with my 2010 LR4....I'll let you know how it goes!