The Morels sound fantastic with the JL600/6. No need to worry about them being under-driven.
In fact, because they are direct line-of-sight to your ears (rather than down by your ankles), they are plenty loud and I can't imagine wanting to go with more amplifier.
The same JL600/6 will drive the underseats quite well, and will still have enough power if you upgrade to Jehnert/SWS8.
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