Zapco ST-6X SQ III 6-Ch. Class AB Sound Quality AmplifierThe ST X Series. Class A B and D Amplifiers. The Studio X line of amplifiers from Zapco was designed specifically for todays car audio market. The Studio X compact chassis makes it an easy fit in any car and even in motorcycle fairings. The square, low profile chassis also means it will be easy to trim out for a great looking installation so your system will look as awesome as it sounds. And speaking of sound This is a Zapco amplifier and sound is