HELIX H400X vs BRAX GL6 + HELIX C 1T + Image Dynamics CX crossovers 4K (INT) - YouTube
Helix H400x amplifier for Sale in Mesa, AZ - OfferUp
FS Helix h400x | DIYMobileAudio.com Car Stereo Forum
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Helix H400X 4 Channel Class D Car HiFi Subwoofer Amplifier Stop Start Compatible | eBay
FS: Process and Amplifier Helix DSP Pro Mk2, Helix H400X, Hertz HDP5, Hertz HCP1D | DIYMobileAudio.com Car Stereo Forum
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