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More speakers doesn't mean better sound, it just means more sound. Your JBLs are still reproducing top-end and mids at the same time as low end. I couldn't judge anything at all with two speakers running at the same time.
The Celestions have no low end really, and the JBLs are just well, loud and bassy (from what I've read online, never actually heard them to be honest). I wouldn't use either for monitoring. The Celestions are great hifi speakers though.
Get yourself a good pair of monitors. Yamaha HS80 if you want something truthful, KRK Rokit RP8 if you want something which sounds impressive/loud/deep.
A room with zero resonance? I'm intrigued...
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