This thread has been primarily concerned with whether or not the enclosure functioned as a horn. A woofer with the right electro-mechanical specs can achive 25Hz as a direct radiator, so that's not an issue. What is an issue, and what we're discussing here, is whether the cabinet provides any useful horn loading at subwoofer frequencies. From all indications, it's a cool looking subwoofer but it isn't a basshorn.