Thanks Parts of the enclosure emit more sound than the actual drivers , by using a sound level meter I could spot around 200hz 400hz until 1660hz vibrations on the sides and back. I guess the MDF I'm using has a low density (700 kg / m3 )and needs to be stiffen or maybe I should use 1" instead of 3/4" for sides and back , I decided to brace with horizontal sheves with openings in them ,between each driver that way the four sides are attached ? About the port I still have to make a final decision as to where to place it , I have the alternative to put it in lower front, lower back, or mid back , considering I only have 30cm clearance from the back to the wall could you advise on that? Port is 15cm diam. and 9.5cm long box is tunes to 39hz .
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