Synergy Series - SA221S

Active Subwoofer

The Synergy Array Series expands in a BIG way.

sa221sfront sa221stop sa221sside sa221srear sa221sstack1 sa221sstack2 sa221sstack3
play video SA221S


  • Bass Reflex powered subwoofer: 6000 Watts (program), 17,000 Watts (peak)
  • 2 x 21-inch Neodymium woofers with 4.5-inch voice coil
  • Exceptionally high output and deep bass
  • Measured MAX SPL (C-Weighted, Max Hold): 130.6dB continuous, 142.6dB peak
  • Frequency response (Hz +/- 3db): 28Hz-100Hz
  • Crossover frequency (Hz): 50 and 100 Hz low-pass
  • Made in Canada


This powerful dual 21-inch subwoofer is the perfect low-end companion to the Synergy Array series, Yorkville Sound's largest and most powerful point-source system to date. The SA221S can be combined directly with an SA153 as an independent system or in combination with the SA153 and SA315S setup as a 5-way system.


Active or Passive Active
Power Rating (Watts) 6000 Watts Program, 17000 Watts Peak
Measured Max SPL (C-Weighted, Max Hold) 130.6 dB Cont. 142.6 dB Peak
Frequency Response (Hz +/- 3dB) 28 - 100Hz
Crossover Frequency (Hz) 50 or 100 Hz lo
Cabinet Configuration Bass Reflex
Driver Configuration 2x21-inch LF woofer
LF Driver(s) 21-inch Neo with 4.5-inch Tetra Coil
LF Power Rating(Watts) 6000 Watts Program, 17000 Watts Peak
LF Impedance (Ohms) 2 amplifiers, 4 ohms per amplifier
LF Protection Excursion, Voice Coil Thermal (RMS)
LF Power Amplifier (Watts) 6000 Watts Program, 17000 Watts Peak
LF Amplifier Type Class D
Cooling Scheme Convection
Power Cable Removable Locking Powercon True Input and Loop Thru Output
Power Switch Yes
Power Consumption (typ/max) 1440 VA / 1920 VA
Inputs 1 XLR with 2x XLR Parallel out, Impedance 35k ohms
Input Sensitivity (Vrms Sine) Line in 1.4 at center, 0.56 at max
Level Controls Volume, -?,0dB,8dB (Min, Top, Max)
EQ Controls Thermal Limiter Advance for power consumption management
Limiter Excursion, Thermal (RMS), Clipping
LED Indicators Power, Excursion Limit, Thermal (RMS) Limit, Input Clip, Activity
Enclosure Materials Multi-ply 15mm Birch Plywood
Stacking Feature Rubber Feet and Cups (Side and Bottom)
Covering / Finish Paint
Other Details 4 x Locking Swivel Casters On Rear Of Cabinet,
2 Stand Adapters (1 Top, 1 Side),
2 UHMW Skid Glides On Rear
Dimensions (DWH xbackW, inches) 32.750 (37.750 including casters) x 29.750 x 47.5
Dimensions (DWH xbackW, cm) 83.2 (95.8 including casters) x 75.5 x 120.6
Weight (lbs/kg) 370/168

Specifications subject to change without notice