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Welcome to DIY Sound Group
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I had assembled a 18” sealed cube from Parts Express, mated with a Stereo Integrity HT-18 V3. As happy as I was with that build… this sealed Sledge/Lavoce 21” subwoofer easily outperforms that previous build in every way. It’s tighter, cleaner more powerful and with room gain, it digs well below 20hz. There are now details within deep bass in movies that I didn’t know were there. I went from 5 subs to the 2 custom builds, experiencing a massive performance boost. I’m so incredibly pleased that I just ordered a second one with funds from selling the other 4 subs.
The build is simple and easy, but very heavy. The design of the bracing results in a rock solid cabinet. I stuffed mine with about 9 lbs of Acousta-Stuf Polyfill, and coated it with DuraTex. I will alway build my subs from now on, but will most likely never need to after the second one arrives.
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