You just have to remember that most horn sub's are HUGE and don't go that low. I use a horn sub, or bass bin I should say. I have it firing into a corner to extend the lower frequencies, but even then, It's down 3 dB at 35 hz. No big deal to me since I pretty much exclusively listen to music on my system. The advantage to them, however, is extreme efficiency and very low distortion for the frequencies it can play. Mine averages around 104 dB with one watt at one meter. 100 watts is extremely loud, and that's all the 12" driver can handle. Search online for "Bill Fitzmaurice", i think that's how you spell it. He's designed many successful horn subwoofers and plans are available online.