Subwoofer design
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Okay, I am totally clueless on how to design a passive radiator subwoofer. How do I determine the enclosure volume and what I need for passive radiators? For example let’s say I wanted to use the Tang Band W5-1138SMF 5-1/4″ Paper Cone Subwoofer, how do I know what the enclosure volume should be, do I use sealed or vented recommendations? From there how do I determine what I need for passive radiators?
TIA
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These are very good questions. Here’s a good rule of thumb. Open WinISD, select the driver you want to model and select a ported design. Once that opens take note of it’s recommended ported volume. Also feel free to mess around with this to make sure it is the size you want. Sometimes WinISD does some will stuff. Then take a look at this video I made on Passive Radiators, it should help you see what to look for in WinISD. Let us know if you have more questions.
https://youtu.be/sG_8qgSjUqE?si=khJn0yGT7b8PaHWa
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So, after I figure out the volume does the shape matter? Here is a quick illustration of what I was thinking of trying (not to scale). The entire box would be a sealed enclosure, which would house the sub-woofer and passive radiators. Inside this enclosure there would also be two more sealed enclosures, for each of the mid-range/tweeters. The total volume of the enclosure, minus the two speaker enclosures, would equal the required volume for the sub-woofer. My question would be whether or not the passive radiators must be within a specific distance, or ‘line-of-sight’, of the actual sub-woofer driver?
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