Sonosub build (16") 15.5" ID tube, SS12-22, 15 Hz, replacing an SB-1000

[Hdale85]

I've been running an SVS SB-1000 for a while and I've finally hit the end of what it can do. It's a good little sub and I have no complaints about it for what it is — sealed 12" in about a cubic foot, 300 W, published at 24-260 Hz ±3 dB. But I keep noticing the bottom octave isn't there, and...