SP-1812AP SP-158AP SP-K615AP SP-K618AP SP-1563AP SP-156AP
SP-155AP SP-115APM SP-112APM SPM-155AP SPM-152AP SPM-122AP

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The SP-158AP is a compact, higher dual powered, one 15” woofer, bass-reflex rectangular enclosure, designed for portable systems.
A dual channel STK class AB output power amplifier with active X-over(24dB/Oct) incorporated into the system. The one power outputs dedicated to powering internal 15” SK15500F woofer, the other one power outputs may be used in of two ways(see to the bellow drawign)


  • Dedicated subwoofer system and full range active systems.
  • The enclosure construction: “STK Standard”
  • Ultra tough, the scratch proof warnex texture coated
  • Two side handles one on each side for easy repositioning.
  • Impact-resistant perforated metal grill(1.5mm)with weather proof powder coated.
  • 35mm pole mount receptable on the top.
  • “SCP” STK caster, “SPM” STK pole option.
Model SP-158AP
System configuration Powered Subwoofer
Components & Loading One SK15500F 15”, Bass-reflex
Operating Mode Active
Frequency Response  
±3 dB 53Hz ~ 350Hz
-10 dB 45Hz ~ 350Hz
Axial Sensitivity(dB SPL, 1 watt @ 1m) 99
Nominal Input Impedance(ohms) 4
Power Handling(Watts, Continuius) 400
Power Handling(Watts, Peak) 1600
Calculated SPL Limit
(Referenced to 1 m)
Peak 132dB
Long Term 126dB
Optional Accessries 1 STK Caster "SCP80" or "SCP 100"
Optional Accessries 2 STK Pole "SPM35130"
( ±0.13 inch / ±3 mm)
Height 540
Front width 476
Depth 595
Trapezoid angle(degrees)  
Shipping/CBM 0.26
Net weight 41.9 kg
Shipping weight 45.94 kg
Output Power  
4 ohm 400W x 2 (Internal In, External In)
8 ohm 250W x 2 (Internal In, External In)
Frequency Response 20Hz ~ 40kHz
THD 20Hz ~ 30 kHz 0.08%
S/N Ratio
(Filter : A-waiting, RMS)
Input Sensitivity +4dBm(1.23V)
Damping Factor >350
Crossover Frequency 1. 90Hz 24dB/Oct
2. 120Hz 24dB/Oct
Low cut Filter 30Hz 12dB/Oct
Input impedance 10k ohm (Balanced XLR)
Connectors Input 2 x Female XLR
Connector output 1. 2 x Male XLR(Mixer out)
2. 1 x Neutrik Type Speakon
Power Requirements 1100 Watts
Special Features 1. Sig LED, Cilp LED, PRT LED
2. Lowest in-rush trodial X-Former
3. Variable speed fan
4.Largest power supply capacitance
5. STK 7 Way Full Circuit Protection
6.AC Out Let for Satellite Active Speaker
*Specifications subject to change without notice.
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Tel. 82-32-525-1788~1789 Fax. 82-32-525-1784   E-mail : stkcom@stkpro.com