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I would start by adding a tweeter to the center channel, amplifying/bandpassing the L7 underseats, and adding the 15" IB sub. That will dramatically improve imaging, mid bass and bass response. Replacing the speakers and keeping the L7 system is complicated and expensive, and does not give you the cleanest signal to do the new speakers justice.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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