I don't understand how Hsu measures the extension specs on their subs. Bass extension = 15 dB? What does that mean? It plays down to 15 dB... but how much volume is it giving up at that level? Where's the +/- rating?

If you look at their sub comparison page, you see that on one of their subs (the MBM-12), they do list the entire frequency response with a +/- rating... the rest list only the mysterious "extension" number. I know Hsu is a relatively well-regarded sub manufacturer, so this lack of information seems odd to me.

Jason

Epic 80-800: HG Cherry