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Rainbow Car Speakers, Sub-woofers High power Amplifiers. Dream Line - Beat - Sound Line - Germanium Line acoustical and perfection. Rainbow products purchased and installed by us have a nationwide FourMasters guarantee. Rainbow Car Amplifier line up consists of: Germanium, Beat & Dream - Rainbow Car Speaker line is made up of: Germanium Line (GL), Sound Line (SL), Dream Line (DL), Experience Line (EL), Profi Line (PL) and Intelligence Line (IL). The new DSP with Wi-Fi is also now available from CarAudioStuff.