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Hi Chris, As you asked there, I wasn't even wearing ear plugs ( a bit stupid) but since is was out side it didn't seem to be that loud. Inside a room I can get everything to vibrate so at least I know there is a fair bit of power there. I still think that the SPL readings I got sound a bit OTT...

Just doing a bit of research here on flared ports and have my hands on some decent software in college (a few of ye have mentioned it before I think, ALGOR). I have done a few analyses on 3” ports with no flare, 30mm, 40mm, 50mm and 60mm radius flares. I used a frequency of 16Hz since this...