NHT SA-2 - 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 Level Output Barrier Strips - Speaker level connection to satellite speakers
(F) High Level Input Barrier Strips - Speaker level connection from amplifier or A/V receiver
(G) Line In - Low level RCA input jacks
(H) Low-Pass Filter (Subwoofer Fc) - Continuously variable low-pass crossover control
(I) High-Pass Filter (Satellite Fc) - 3-way selectable high-pass crossover for satellite line out
(J) Line Out - Low level RCA output jacks to receiver / main amplifier
(K) Subwoofer Phase Selector - 2-position selectable phase control
(L) Standby Mode Switch - Selects standby mode on or off. Status LED shows orange in standby mode
(M) Input Voltage Selector - 115VAC or 230VAC line voltage selector switch (note: under a removable cover)
(N) AC Power Connection and Fuse Holder - For universal line input connection
Front and Back Panel Diagram