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  ST-1000XM II
  (Single channel, Class D,  Bass Amplifier, Strappable to use a pair of amps on a single voice coil, Power @ 1Ω: 1 x 1000 watts)
  

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  ST-1350XM II
  (Class D,  Bass Amplifier, Variable center frequency for bass boost,Strappable to use a pair of amps on a single voice coil)
  

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  ST-4X P
  (4-Channel, High Power Full Range, Class A/B Amplifier. Power @ 4Ω: 4 x 80 watts, Power Bridged @ 4Ω: 2 x 240W RMS)
  

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  ST-4X SQ
  (4-Channel, Full Range, Class A/B.SQ Upgrades: Op-amps, Caps,RCA and Speaker Level Inputs. Power @ 4Ω: 4 x 65 watts)
  

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  ST-500XM II
  (Mono Class D, Bass Amplifier, Variable electronic crossover, Power @ 4Ω: 1 x 200 watts, Power @ 2Ω: 1 x 300 watts, )
  

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  ST-5X II
  (5-Channel, Full Range, Class A/B, Power @ 4Ω: 4 x 100 watts Plus 1 x 200 watts, Power Bridged @ 4Ω: 2 x 300 watts RMS + 1x 300)
  

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  ST-850XM
  (Class D,  Bass Amplifier, Strappable to use a pair of amps on a single voice coil, Power @ 4Ω: 1 x 400 watts, Power @ 1Ω: 1 x 850 watts)