Made in South Korea, HOOL-SPL series amplifiers provide the most advanced SPL options for audiophiles seeking maximum power with unparalleled performance and sophistication. Find the most powerful subwoofers and plug them to the SPL series. Create an elaborate build, compete, win. These amplifiers are the highest rated amplifiers today's technology can manufacture. Only recommended for serious installers, competitors, and people who want to be heard by anyone within a mile radius.