Pic of some JBL Concert Series
Since you mentioned the JBL 48 series (4828), i've looked at some of these 48.. Concert Series systems. Well, another place where JBL 2226 boxes (4870A family) are tuned to 40hz. The two VLF systems shown (4842A/4845A) use the 2241 (not 2226) for 30hz bass. I think for capability and reliability related reasons.
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