H-PAS Bass System: H-PAS (Hybrid Pressure Acceleration System) is a unique, patented bass system that combines the best of four bass technologies: acoustic suspension, inverse horn, bass reflex, and transmission line. By cascading the four technologies onto one another in a precise, matematically-determined formula, H-PAS achieves extremely deep bass response from small woofers in a compact enclosure, with no requrements for a high powered amplif...