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If you're going to replace the head unit I would 100% forget about trying to make use of the OEM amplifier. Really, do yourself a favor and just stick a fork in it.
Regarding the OEM subs, your observation is the same as mine and others. Either the amp section for the sub is blown or thats just how it sounds.
The OEM front drivers are a funky mix (4ohm tweets and mids, 2 ohm mid-bass) that your HU amp may not like. Give it a shot though, I was able to run them from the onboard amps in the JBL signal processor I installed and they sounded pretty good. The OEM mid-bass hits very hard!. That said, the minute I swapped the front drivers and added an external amplifier everything really came to life. The difference in how the front mid-bass' sounded (got much more punchy and tight) was astounding.
The 10" sub that may be all you need in the coupe. I wouldn't do the 6.5's if you like what the 10" gives you.
Report back on your progress!
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