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This close up shot of the rear panel on a powered array speaker shows 1/4 inch jack; mic in, tone & volume controls, RCA line in, fixed and variable line out. Some features are redundant to provide ease of access regardless of how the speaker is hung.
Click to learn about the line-in feature on the PI30-PS array speaker www.califone.com/blog/2009/05/21/21st-century-av-support/