Home/neutrik/Product/SpeakON NL4MP - speakON NL4MP (wired 1+/1-, 1-/1+ polarity inverter, 2+/2- not connected)
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speakON NL4MP - speakON NL4MP (wired 1+/1-, 1-/1+ polarity inverter, 2+/2- not connected)

Reference : NA4MP-M-X