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5. SA218S Level Control
This control adjusts the volume level of the SA218S relative to the input signal level. Mixers and other audio
sources connected to the SA218S tend to have different output voltages, which mean the level control on the
SA218S is used to fine tune the cabinet's volume relative to the mixer settings. It is perfectly acceptable to set
the SA218S Level above or below the center 0 dB setting.
6. Clip, X-Max, VC-Therm, Activity Indicators
The Clip and Limit LED indicators illuminate to guide the user to proper operating levels.
Illumination either of the yellow Limit LEDs indicates that a level has been reached where the SA218S limit-
ers are reducing the signal internally to prevent damage or distortion. It also indicates that further increases in
input level or increasing the SA218S Level control position will not appreciably increase acoustic output.
The red Clip LED indicates that the input level is excessive and further increases in level will cause severe
distortion The input signal should be reduced at the source until Clip activity ceases. The clip indicator comes
on at 12 Vrms,16 volts peak. The input clips at 17 Vrms, 24 volts peak.
The activity Indicator comes on at 5 mVrms or -45 dBV.
7. Line Current Limit Control
The Line Current Limit control allows the power to be reduced to allow operation on limited power availability.
Full power transients will be allowed through but if the average power is excessive then the power will be lim-
ited. This control works by advancing the limiter that limits the voice coil temperature and by monitoring the cur-
rent draw. In the 10 amp (5 amp CE) position the average power is limited only by the voice coil temperature.
In the 8 amp (4 amp CE) position with most music, the limiter will be only active occasionally depending on the
music content. In the 7 amp (3.5 amp CE) position certain types of music will not be limited, primarily music
without deep bass or where the bass is unprocessed. The 5 amp (2.5 amp CE) position will significantly reduce
the output when the music content has continuous bass content below 45 Hz. The green power on indicator will
dim to indicate when the line current limiter is active. A small amount of dimming indicates that the advanced
thermal limiter is active while significant dimming indicates that the line current monitoring system has detected
excessive line current. Low line voltage typically due to long power supply cables may cause excessive line
current, the line current monitoring system will prevent this from tripping the power source circuit breakers.
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