YORKVILLE SYNERGY Manuel De L'utilisateur page 4

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. Line Current Limit Control
The SA221S can operate on 15 amp 120VAC power sources or 20 amp 120 VAC power sources. Safety
regulations limit the power draw on these circuits to 80% of 15 or 20 amps. The SA221 operates within these
limitations. The stock product limits the current to 12 amps and when modified by a qualified technician us-
ing the SA221KIT will increase the limit current to 16 amps. Operation when set to 16 amps requires the
appropriate power cord and 20 amp power source.
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 the average power is limited only by the voice coil temperature.
In the 12 amp position with most music, the limiter will be only active occasionally depending on the music
content. In the 8 amp position certain types of music will not be limited, primarily music without deep bass or
where the bass is unprocessed. The 6 amp position will significantly reduce the output when the music con-
tent 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 cur-
rent. 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.
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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.
The average power limit control allows the power to be reduced to allow operation on limited power avail-