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EF 45The EF 45 ELEMENTS base accommodates the pole, the power amp module, and the mid/ high unit. The NL4 ports on both sides serve to patch the audio signal in and route it through to further speakers. If you place an amp on its feet, you can connect another passive subwoofer to its Speaker Out port. The NL4 ports on the side panels also let you use a speaker cord to connect mid/ high units mounted on further poles.