QSC Audio Products
QSC Audio Products, LLC is a leading manufacturer of power amplifiers, loudspeakers, signal processing, digital signal transport, and computer control systems for professional audio markets worldwide.
http://www.qscaudio.com

Cadence
Manufactures car audio amplifiers, speakers, signal processors, and subwoofers.
http://www.cadencesound.com/

Precision Power
Manufacturer of amplifiers, speakers, subwoofers and signal processors. USA.
http://www.precisionpower.com/

Centasound
Tube multimedia and integrated amplifiers and digital signal processor (DSP).
http://www.centasound.com

Eclipse
Specialist mobile audio, video and navigation products manufacturer
http://www.eclipse-web.com/

Phoenix Gold
Manufacturer of car audio amplifiers, speakers, signal processors, and accessories.
http://www.phoenixgold.com/

Earthquake Sound
Manufacturer of car audio speaker systems, amplifiers, and signal processors.
http://www.earthquakesound.com

Power Acoustik
Manufactures mobile audio speakers, signal processors, head units, subwoofers, and amplifiers.
http://www.poweracoustik.com/

GPS Networking, Inc.
Supplying GPS antenna splitters, amplifiers, re-radiating kits, filters, combiners and GPS signal distribution systems.
http://www.gpsnetworking.com/

Rockford Fosgate
Manufactures source units, signal processors, amplifiers, speakers, installation accessories, punch support.
http://www.rockfordfosgate.com/