I think the system that's in the overland is fine for the average joe who likes crank it from time to time but if you really want to feel the music ( I love mostly rock music and soft rock and some old dance music ) the HK in the summit satisfies my LUST for loudness just fine . And I really like it loud sometimes . The other day I was listening to Judas Priest screaming for vengence album from beginning to end . I was just in music paradise . It's just AWSOME ! And should be considering how much I paid for this truck . I shouldn't have to invest more money in a $52,000 dollar truck .