Are you saying your guitar goes down to the F# nearly one octave below the typical low E? If your guitar has significant output in that range, the only real way to do it justice is with a dedicated sub. But those are sure heavy and a pain to haul around.
Regarding the QSC K10 vs K12, the increase in bass response is only slightly more with the K12. Overall I'd go for the lighter weight of the K10. Also like its wider 90 degree dispersion for most situations.
Keep in mind when comparing speaker dispersion patterns, this mostly applies to the upper frequencies ABOVE the crossover point. Below that point, speakers become more and more omnidirectional. Low mids and bass are completely omnidirectional, regardless of what the claimed dispersion may be.
Keep playing,
Steve Schuch
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