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Synergy SA221S Powered Speaker
Thank you for choosing Yorkville's Synergy SA221S subwoofer, the companion subwoofer to the SA153. The SA se-
ries excels in sound reinforcement applications where a line array is desired but cannot be easily accommodated.
Cabinet Features
The SA221S is constructed of high strength multiply birch plywood for ultimate durability. There are 2 woofers,
each 21-inch-long-throw.
Electronic Features
A Yorkville proprietary DSP platform provides processing to prevent over-excursion (X-Max), voice coil overheat-
ing (VC thermal) and clipping. The DSP uses IIR filters for crossover and equalization and there is a small delay
added to time align with the SA153 top box. The X-Max limiter and the VC thermal limiter are both frequency
sensitive and calibrated to match the characteristics of the driver and cabinet system. The VC-thermal limiter
can be advanced to limit the power draw in cases where there is less than ample power available. The X-Max
limiter is faster, pretty much instantaneous. The VC-thermal limiter is slower reacting, typically operating near
the end of a bass beat at 120 bpm.
The amplifier is a high headroom Class-D design. There is a large capacitor bank so that bass transients are
less dependent on the quality of the power line.
The limiter indicators indicate when the X-max or VC thermal limiters are active. Typically, the X-max lim-
iter is more active but this is content dependent. The effect of the line power advance can be observed by
carefully watching these limit lights as the control is changed while operating in limit. The VC-therm indicator
will come on sooner as the Average Power limiter is advanced. With many types of music, the effect of the
VC-therm limiter will be minimal.
1. Power Switch and Indicator
The green power LED illuminates when the power switch is turned to the On position and AC voltage is sup-
plied. When the power is removed or the power switched is moved to the off position the green power indicator
will blink while the power supply is discharging. The processing circuitry will not reboot unless the power supply
is fully discharged before being turned back on. It is not necessary to reboot however. Turning the power back
on before the power supply is discharged will simply resume normal operation.
2. PowerCON TRUE AC loop thru
As a standard, the AC inlet on the SA221S accepts locking PowerCON TRUE power cords. There is also an AC
outlet that can be used to loop power through to other cabinets in your array using a male to female PowerCON
TRUE looping power cord. Check with your local Yorkville dealer for availability of these accessory cords.
Warning: Do not exceed a total load of 20 A on the looping AC chain.
3. Input Jack
This female-XLR accepts line level XLR microphone cables. For best noise reduction use balanced sources.
4. Dual Link Outputs
These XLR male connectors can be used with a standard XLR cable to daisy-chain up to 20 SA221S or SA315
cabinets without signal degradation. Simply loop from one cabinet's Link jack to the next cabinets Input jack. In
many cases this limit of 20 cabinets can be exceeded, consult Yorkville Sound for more details.
5. SA221S Level Control
This control adjusts the volume level of the SA221S relative to the input signal level. Mixers and other audio
sources connected to the SA221S tend to have different output voltages, which mean the level control on the
SA221S is used to fine tune the cabinet's volume relative to the mixer settings. It is perfectly acceptable to set
the SA221S Level above or below the center 0 dB setting.
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