Did you not look at the dimensions of that box? How would you even think it was tuned in the 20's haha. If it was tuned in the 20's the sub wouldn't come close to unloading playing Rack City haha. This box is somewhere around 35hz I believe. I'm not entirely sure though. It was designed by Pro-Rabbit here on the forums and he said it was tuned to 35 I believe. But considering the design was 0.75" MDF and it ended up being made of 1" HDF with the same dimensions and it doesn't have the second baffle that means the tuning is probably even higher than 35hz. I tried running test tones from 30hz-40hz to find the spot where excursion was the least but it had no real noticeable difference in excursion between 30-40hz.
How much would it cost for your guy to ship to Victoria BC, Canada? That's the main reason why I'm looking for a Canadian builder so that I don't have to pay more for shipping than the cost of the box itself haha.
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And no I cannot build myself. Living in an apartment kind of hinders that lol