NHT SA-3 - Manual (Page 5)

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(A) Power Switch - Turns the unit on and off
(B) Power / Status Light - Tri-color LED: Green (On), Orange (Standby), Red (Protect)
(C) Volume Control - Adjusts the loudness of the subwoofer independently of the main speakers
(D) Subwoofer Output Terminal - 5-way binding posts for connection to the subwoofer
(E) High-Pass Filter (High Pass Fc) - 5-way selectable high-pass crossover for line out
(F) Low-Pass Filter (Low Pass Fc) - Continuously variable low-pass crossover control
(G) Subwoofer Phase Selector - 4-position selectable phase control
(H) Line In - Low level RCA input jacks
(I) Line Out - Low level RCA output jacks to receiver / main amplifier
(J) Input Voltage Selector - 115VAC or 230VAC line voltage selector switch (note: under a removable cover)
(K) AC Power Connection and Fuse Holder - For universal line input connection
Front and Back Panel Diagrams