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I rotated the subwoofer 90 degrees facing the horn out into the room along a wall. I moved the microphone to a different position ( to the listening position at the couch) and I tried a different amplifier, to no avail... I also sealed up the inner chamber as best as I could, I applied tons of extra...

I'm starting to think the measurement is somehow wrong, I have the same exact response albeit at a lower SPL with the unit in free air...

Hello I finished building the TubaHT to a width of 70cm (roughly 27 inches). I loaded it with the Dayton Audio RSS390HO-4. I placed the subwoofer in a corner with the mouth of the horn facing into the corner 18 inches from the wall per the plans. I placed the UMIK 1 calibrated microphone in the mout...

Thank you for your replies, I appreciate it. Wood screws it is!

Hello I'm currently in the process of building the TubaHT. I have a question regarding the mounting of the subwoofer to the panel (panel 4). Initially I was going to screw the subwoofer to the panel using woodscrews, all the way into the retention blocks. However seeing as the subwoofer is supposed ...