SoundQubed 18" HDX4 Series Subwoofers 18" Subwoofer Frequency Response: 3 kHz -

Frequency Response: 3 kHz - 20 kHz

(1) PRESET warning label

Nominal Size

Performance Specs

Eight 1-3/8" Screws

SoundQubed 18" HDX4 Series Subwoofers 18" Subwoofer Frequency Response: 3 kHz -HDX subwoofers build upon the design of the HDC line in response to recent shifts in source material and the mainstream frequency tuning of our customers vehicles. Our team scrutinized all aspects of the HDC subs to improve performance at lower frequencies. The resulting HDX dual voice coil competition subwoofer line is more efficient, plays lower, and sounds better setting a new bar for performance and value. INCREASED EXCURSION The new cast basket