Boston Acoustics

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High Performance Mobile Audio Amplifier


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Boston Acoustics SPG555.

    Read the Performance Auto & Sound review of the GTA-400M


  • High efficiency Class AB design
  • Boston’s Q-Tune™ circuitry for Simple Bass Output Optimization
  • SST™ (Symmetrical Signal Topology) system uses balanced asymmetrical inputs for noise cancellation
  • Fully adjustable and selectable Lowpass/Highpass crossovers
  • Wrap-around heatsink design for ample cooling in multiple mounting positions

  • Compact chassis allows for placement flexibility
  • Dedicated High- (speaker level) and Low- (RCA) level inputs
  • Optimal angled speaker and power blocks for easy wire connections
  • All input/output connections are located on one side of the amplifier to ease installation and wire management
  • IMS™ (Integral Mounting System) reduces the amplifier footprint
  • Recessed control panel for clean installation and concealed wire management
  • Optional GTA-RSL remote gain for controlling the subwoofer volume from the drivers seat


Mono Power @ 4-ohm(CEA-2006-A):
250 Watts x 2
Frequency Response (-3dB):
Signal to Noise Ratio (A Weighted):
Lowpass Crossover:
12dB Adj. (50Hz to 200Hz)
Highpass Crossover:
12dB Adj. (50Hz to 200Hz)
2 3/8"(61mm)
14 3/4" (375mm)
4 Ch. Power @ 4-ohm (CEA-2006-A):
70 Watts x 4
4 Ch. Power @ 2-ohm (CEA-2006-A):
125 Watts x 4
8 3/8" (211mm)
4 Channels

Customer Reviews

Reviewer: Aaron

this amp is ok clear and clean sound but lacks power so i gave it to my son for his car. Im going with the gt5750 5 channel, i have not hook it up yet i hope it has more power than the 704 front and rear speakers than the 704 4 channel did.

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