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Disconnecting AC Power to the SP® 118P Sub
We recommend that the Power switch (1) be used to turn the unit off first, and then the AC power cord can be
removed, this minimizes stress to the power amplifiers and the transducers from turn-off transients. The pow-
er switch has an arc suppression capacitor to help during turn-off, and tends to make a clean disconnect from
the AC power, while the power cord IEC connector can make intermittent contact before finally becoming fully
disconnected, e.g., as when wiggling the cord.
DSP User Control Menu Operation
SP® 118P Sub DSP User Control Menu Operation
A two-line, 16-character per line LCD and a rotary push-to-select encoder make up the interface for this prod-
uct.
The DSP processing control accessible by the user, consists of a 9-band graphic equalizer (GEQ), choice of output
Polarity, selection of Bass Enhancement, and signal Delay. This is applied to the powered speaker system, and in
some cases, to the processed output. The user can also select from a menu of preset Program EQ settings that are
applied to the graphic equalizer and Bass Enhancer.
User interface:
Rotating the encoder takes the user thru the top level menu screens. These screens will display current infor-
mation such as a Input Level meter, configuration and current user settings. Pressing the encoder on a top level
screen will take the user to related selection screen(s) when relevant. The configuration screens play an im-
portant role in preparing the speakers for the intended application. The configuration screen comes up after the
initialization screen when the speaker is powered on. If the configuration screen is not selected within 5 minutes
the Input Level screen is displayed . The user can still select this screen at any time by rotating the edit knob.
The configuration screens help the user set up the SP® 118P Sub system for optimal operation. By answering a
couple of questions, the processor is configured and proper connections displayed. When complete, the user is
returned to the main menu.
The LCD backlight will dim after 5-minutes without interface activity but returns to full brightness when the
encoder is moved. When the backlight auto-dims, the display returns to the Input Level screen. This prevents
inadvertent changes from occurring while reactivating the LCD backlight.
The main menu screens are:
Configure?
Input Level
Program EQ (Presets)
Delay
Graphic EQ
Polarity
Power amp Temperature
Front LED On/Off
Auto power Off
Security Lock
Main Screens:
Input Level meter:
Displays current input signal level.
Will prominently display status if DDT is engaged, by displaying the letters "DDT" on the
right hand side of the display.
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