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The other question is "why would you want to?" Unless you're adding a sub, you'll find the sound will be shallow with that arrangement. There are plenty of other options.
Just remember, more speakers are NOT always better.
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The next step after this would be to go with an aftermarket amplifier for your speakers. This does deliver the best sound quality depending on equipment used and other potential prep work like sound deadening which really makes a difference in sound quality and helps your speakers perform better.
The best thing you can do is figure out a what you want out of your sound system then figure out what you can spend to try and achieve this.






