Unboxing Amplificador Helix H-400X Audiófilo Made in Germany. - YouTube
FS Helix h400x | DIYMobileAudio.com Car Stereo Forum
HELIX H400X - Gilbert & Co.
Helix H400X 4 Channel Class D Car HiFi Subwoofer Amplifier Stop Start Compatible | eBay
Musico Mobile Audio - Another favourite of mine from Audiotex Fischer Germany........the Helix H400X amplifier. Taken from their webpage - "...extremely fast MOSFET driver circuits in Class A operation combined with enormously