YORKVILLE Synergy SA221S, Owner'S Manual

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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.
Illumination either of the yellow Limit LEDs indicates that a level has been reached where the SA221S limit-
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.
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 SA221S can operate on 15 amp 120 VAC power sources or 20 amp 120 VAC power sources. The
SA221SCE operates on a 16 amp 230 VAC power source. Safety regulations limit the power draw on these
circuits to 80% of 20, 16 or 15 amps. The SA221S operates within these limitations. The stock product limits
the current to 12 amps and when modified by a qualified technician using the SA221SKIT will increase the
limit current to 16 amps. Operation when set to 16 amps requires the appropriate power cord and 20 amp
power source.
The average power limit control allows the power to be reduced to allow operation on limited power avail-
ability. 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 and by monitor-
ing the current draw. In the 16 amp position (8 amp CE) the average power is limited only by the voice coil
temperature. In the 12 amp position (6 amp CE) with most music, the limiter will be only active occasionally
depending on the music content. In the 8 amp position (4 amp CE) certain types of music will not be limited,
primarily music without deep bass or where the bass is unprocessed. The 6 amp position (3 amp CE) 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.
8. 50 Hz High-Pass Output
The SA221S provides a line level 50 Hz high-pass XLR output intended to provide the correct equalization,
crossover and time alignment to use SA315S subwoofers along with SA221S subwoofers. This output is not
suitable for any other usage. This output should not be routed to the full range cabinets. Normally this would be
used with the 50 Hz lowpass switch depressed.
9. 100 Hz / 50 Hz Lowpass Switch
This switch allows the SA221S subwoofers to be used with SA315S subwoofers. Combined with the 50 Hz
Highpass output this will ensure correct crossover and time alignment.