6) Input Section:
The S-20 offers three stereo input options: two types of balanced inputs (TRS and XLR) and unbalanced RCA. The two balanced inputs are wired in parallel. Note: Standard 1/4” connectors may be used in place of the TRS type if the source equipment employs unbalanced outputs, but this method may induce unwanted noise.
PLEASE NOTE: These different connector options have been provided for your convenience. Use only one connection for the left channel and only one con- nection for the right channel or damage may result to your subwoofer.
7) Output Section:
The output connectors to the satellite monitors are bal- anced, TRS type. Two 12' cables are included to connect the S-20 left and right outputs to the satellite monitors.
PLEASE NOTE: If you are using your S-20 subwoofer with a pair of NHT M-00’s, set the sensitivity switch on the M-00’s to +4.
8) Subwoofer Bypass:
This feature, helpful when monitoring, allows you to turn the S-20 “ON” or ”OFF” on the fly. Any standard “latching” or two-position foot switch that has a 1/4”plug will control this function. A press of the foot switch will place the S- 20 and its High Pass filter into BYPASS mode and remove them from the signal chain. A second press of the foot switch, causes the S-20 to resume operation.
9) Power Section:
The main power ON and OFF switch is located above the power cord receptacle.
Located above to the power switch is an LED Inticator:
GREEN: the S-20 is operating normally.
AMBER: the S-20 is in Standy Mode. When the S-20 doesn’t hear an incoming signal after a period of time it will go into standy mode and will ‘wake up’ and come out of standby mode when it hears a signal.
RED: the S-20 is in FAULT, consult the Troubleshooting section of this manual (pg. 5)
The Port Plug:
The S-20 subwoofer is designed to be used as either a bass reflex or acoustic suspension subwoofer. With the port plug removed, the subwoofer is a bass reflex sys- tem. With the plug in, the system is acoustic suspension. In bass reflex mode, the subwoofer will have lower bass extension and more output capability, but somewhat less- ened transient response. In acoustic suspension mode, the subwoofer will have less bass extension and output, but better transient response. In a room with a lot of low frequency standing waves or where the subwoofer must be placed in a corner, acoustic suspension mode will
probably sound best. In a larger room or where the sub- woofer is farther from the walls or corners, bass reflex mode will work best.
When installing the port plug, put it in the port until it stops, and then push it in another 1/4". It is not necessary to use a lot of force. As long as there is no audible air noise coming from the port, the plug is in far enough.
CONNECTING THE S-20 SUBWOOFER:
Using the S-20 as a .1 or LFE stand-alone device: Connect either an RCA, XLR or TRS from your designat- ed LFE channel or buss output assignment to either the left or right input on the S-20 “INPUT SECTION”. If more subwoofer sensitivity is required, use a “Y” adaptor and connect to both left and right inputs. Turn the low pass control to it’s maximum position. Be sure to utilize sur- round test tone signals to properly balance the woofer level with the other monitor channels. Please read through the Subwoofer Placement and User Controls sections before you begin.
Using the S-20 to augment the frequency response of powered mini-monitors:
Connect the left and right outputs from your mixer or source unit to either the XLR, TRS or RCA jacks on the “INPUT” section of the S-20. Now connect the supplied left and right TRS cables from the “OUTPUT” jacks on the S-20 to your satellite monitors' input jacks. You may also want to connect a foot switch (or any standard 1/4”, 2-position switch) into the BYPASS input on the rear of the S-20. Using this feature is not necessary to the basic operation of the S-20.
