ProMedia GMX A-2.1 Computer Speaker System

ProMedia GMX A-2.1

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  • Two-way satellite speakers: 3-inch woofers and Klipsch's exclusive MicroTractrix horns with ball joint pedestal mounts
  • Subwoofer with 75-watt amplifier
  • Two stereo inputs: one dual RCA one 1/8" minijack
  • Headphone output
  • Superlative dynamic output of 108 dB for music, games and movies



  • Why does the GMX decoder switch back to Pro Logic II Movie mode when I skip tracks on my DVD player?

    The GMX decoder uses a mode hierarchy to select the most appropriate post processing mode. For example, Dolby Digital 5.1 soundtracks will be autodetected and decoded as 5.1.

    For Dolby Digital 2.0 signals, the most appropriate mode is assumed to be Pro Logic II Cinema mode. Pressing the surround button in this situation allows to adjust the mode selected by the hierarchy. The need to do so after skipping tracks or pausing your DVD player depends on the operation of the DVD player. In many cases the Dolby Digital signal is lost, and must be reacquired. Once the signal is reacquired, the system runs through the mode hierarchy again, applying Pro Logic II Movie mode.

  • Why can't I select change the DSP mode while in Dolby Digital?

    Dolby Digital 5.1 soundtracks cannot have DSP modes applied to them. If a 5.1 soundtrack is being received, pressing the Surround button will have no effect.

  • Why can't I select 5 channel stereo while listening to a Dolby Digital 2.0 signal?

    5 channel stereo can not be applied to Dolby Digital 2.0 signals.

  • My Front channels are too loud. Why can't I adjust their levels?

    Due to the nature of the design, unless your speakers are at extremely different distances from the listening position, only minor adjustment should be required. For the system to be set up properly, the center, surrounds, and subwoofer should be adjusted to match the level of the front left and right channels.

  • How do I reset the GMX decoder?

    In the unlikely event the GMX decoder needs to be reset (such as a system lockup), you can do so by shutting down the power switch at the rear panel of the subwoofer; wait 30 seconds and turn the power switch back on.

  • Regarding Soundcard connectivity:

    To connect a soundcard's digital output to the GMX system, you may use the included dual RCA to mini plug y adapter.     

    For Soundblaster cards, plug the mini plug end into the S/PDIF output of the card, and the white RCA plug into the Coax In of the GMX decoder.     

    For Turtle Beach Santa Cruz, plug the mini plug end into the S/PDIF output of the card, and the red RCA plug into the Coax In of the GMX decoder.

    Note: When playing an analog signal (mp3s, music CD, PC sounds, etc) through the S/PDIF output, you will hear the front two speakers and subwoofer when the decoder is in stereo mode. Changing the Surround mode to 5CH Stereo or PLII will allow you to listen through all 5 speakers.