Ground Zero GZHW 20SPL is a real candy. In performance and looks. And built to play LOUD! Hydrogen SPL subwoofers are optimized with Klippel. Measurements done during 10 hours of test drive are so crucial that there are no weak spots left after optimization is done. Power used during these tests is four times bigger than drivers power rating. Result is a very well balanced subwoofer. With all parts working as they should.
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