Cube Cubed - a Passive Radiator Subwoofer Build

I have always loved passive radiators, so I thought I would finally do a build log along with all the parts needed. Thanks to Parts Express, I am able to bring one of these Passive Radiator Builds to life. My goal was to make a small subwoofer that would still have high spl, for a smaller room all while keeping the cost of the major parts under $200. As I looked around, I haven't found many great subs in that price range, so I thought DIY work might give the best bang for the buck. Here's a list of all the parts chosen for this project along with links:


Dayton Audio DCS205-4 8" Classic Subwoofer 4 Ohm
2 - Dayton Audio SD215-PR 8" Passive Radiator
Dayton Audio SA100 100W Subwoofer Plate Amplifier
Harrison Labs FMOD Inline Crossover Pair 30 Hz High Pass RCA

I didn't have a separate DSP, so I had to go with an FMOD for the High pass to protect the woofer from over excursion. I did test it, and it was an issue. ALthough, if you have a DSP you would not need the FMOD. The total cost with the FMod is $190.

The Enclosure is a very small footprint sitting at a 14" cube with 3/4" MDF or a 13.5" cube using 1/2" MDF. So it is a great footprint for a smal room.

Later I'll post the theoretical response before room gain via WinISD. I will say, I have been playing this and it blew me away. I was very pleased with the SPL this thing can put put out, especially for it's size.