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Almost first time DIY’er here. Built a speaker kit many, many moons ago (back it the 70’s). Looking at building a pair of sub-woofers. Have done a lot of research, but it seems the more I read the more confused I get.

My bookshelf speaker are wonderful, but are lacking a little in the bass, -3dB at 50Hz. I would like to extend this downwards a little. Don’t need wall shaking bass, but there are cases where I do miss something going a little further down.

What I’m considering is to build two sub-woofers as stands for the bookshelf speakers. The bottom of speakers are about 11″ x 11″ and need to be approx. 26” off the floor. May be able to add an inch or so to these measurements, depending on how the box/stand is designed.

Even though the stereo is also doing double-duty providing the sound for Netflix and movies the most (only) important reason for adding the subs is the music.

Downloaded WinISD and have been playing with it and Dayton Audio 8″ woofers, but I’m not quite sure what I’m doing.

Any ideas how to go about this? Should I go sealed? Or ported? Is 8″ enough or is it possible to squeeze in a 10″ woofer?