Subs are long throw speakers that have a much different frequency response than standard speakers of the same diameter. The speaker's cone edge is constructed of a very pliable, rubber material that actually rolls back and forth with bass sounds.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)