1
Synergy SA115S Powered Speaker
Thank you for choosing Yorkville’s Synergy SA115S 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 SA115S is constructed of high strength multiply birch plywood for ultimate durability. The SA115S uses s a
single 15-inch long-throw woofer.
Electronic Features
A Yorkville proprietary DSP platform provides processing to prevent over-excursion (X-Max), voice coil over-
heating (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 fre-
quency 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
limiter 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.
SUB
LEVEL
LINE
CURRENT
LIMIT
dB
33
AMPS
44
55
22
Off
Off
8
-12
-24
4
6
-6
2
-2
1
00
Activity
Pwr
Limit
X-MAX
VC
Therm
Input Clip
AL
L
CONNECTED IN P
ARALLE
L
5A = MAX Output
4A = 90% Output
3A = 80% Output
2A = 60% Output
