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6. Clip, X-Max, VC-Therm, Activity Indicators
The Clip and Limit LED indicators illuminate to guide the user to proper operating levels.
ers are reducing the signal internally to prevent damage or distortion. It also indicates that further increases in
input level or increasing the SA221S Level control position will not appreciably increase acoustic output.
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.
7. Average Power Limit Control
The average power limit control allows the power to be reduced to allow operation on limited power availabil-
ity. Full power transients will be allowed through but if the average power is excessive then the power will be
limited. This control works by advancing the limiter that limits the voice coil temperature. In the 100% posi-
tion the power is limited only by the voice coil temperature. In the 75% position music with deep continuous
bass will be limited but many types of music will not. In the 50% position only certain types of music will not
be limited, primarily music without deep bass or where the bass is unprocessed. Voice applications typically
will not be limited in the 50% position.
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Illumination either of the yellow Limit LEDs indicates that a level has been reached where the SA221S limit-
The red Clip LED indicates that the input level is excessive and further increases in level will cause severe
The activity Indicator comes on at 5 mVrms or -45 dBV.
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