4 - 8 inch DIY Subwoofer Box Flatpack Kit

I love the box thank u very much it save me alot of time of making onec

Box is great only problem I had was having to open the holes for subs because they were to small even after asking if the subs would work in the box

A great DIY sub box kit. All wood pieces intact. No damaged parts. All cuts are square, which makes assembly easier. And of course great service from D4S.

To start off, I emailed asking about the actual size to this box (I have dimensions to stay within as space was limited), because the description doesn't match the measurements in the image. I was told the measurements in the description were the correct ones, They NOT the correct ones, the measurements are what is in the picture. 12"x32"x25" (which made it not fit the space I had, so have to use it for a different build.....) and the port is 4"x10.5"x32.5" comes to around 3.37ft^3 tuned to around 29hz that's without any sub displacements and roughly .05 for the 45s with 42in2 of port area, 12.46in2 per foot. (3.05ft^3 after .32 of woofer displacement "4 SA 8 V3s" which changes the tuning to 30.5hz and 3.05ft^3 Net Volume) The "3/4 mdf" is about 1/8th thinner than any of the MDF I have ever had at my local stores, which is no biggie just pointing it out. Now to the build part, when installing the ports you have a 4" wide port in the front but when you go to put the bend at the back of the port, it leaves 2.5" from the back wall, so your port is going from a 2.5" back gap to a 4" gap in-front, ports are supposed to be spaced evenly along its length. To fix this the longest part of the port walls has to be cut off by 1.5" and 2 new pieces have to get cut to 10.5"x7" for the bend to allow you to have 4" evenly across your port while keeping the same port length. There is some nice countersink holes where they did pre-drill some of the holes, I say some because there is some pre-drill holes that were either missed or they just don't do. So you will have to pre-drill a fair amount or risk splitting the mdf. It did come with a cup terminal which, I wasn't expecting and it was countersunk into the side wall, which was pretty nice, and it has a foam backing to seal. The wood was cut evenly and square, so everything lined up fairly good. The cut outs don't fit Sundowns SA V3 8" or E8 V6 8" subs without some minor sanding of the hole to get it to fit. Which is common with pre-fabs as one size doesn't fit all. In summary, the box isn't bad per-say for a quick toss together or for those who don't have tools or are attempting their first box build, it's better than most of the cheaper pre-fabs you see on the market, but it's not without issues as mentioned above. My own fault for being lazy and buying a pre-fab instead of building my own for half the cost like I usually do, spent more time figuring out its actual specs, tuning etc running it through WinISD and modifying it, than I would have just designing my own, cutting it and building it. I gave it 3 stars, because it would be functional as it was for most people I guess, but the dimensions being wrong even after contacting them about the size is a pretty big problem when someone has limited space, that's a make or break to an install right there.