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Triticum Agricolam

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Triticum Agricolam last won the day on September 15

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    Speaker enclosure design & construction

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  1. These are other parallel-tuned 6th order bandpass boxes. They have two tuning frequencies which allows you to shape the frequency response in ways you can't do with a regular ported box. That does not make them better however, just more sophisticated. If I can give you some advice, for 98% of applications a regular ported box is going to provide the best performance relative to how much space it takes up, and how difficult it is to design/construct. Bandpass boxes generally only perform better when you have a specific problem you are trying to address, and they almost always have drawbacks.
  2. The box in the picture is symmetrical, so the left and right chambers are going to be the same volume/tuning. The center chamber would be tuned differently though. In the end its just another way to layout a parallel-tuned enclosure. Its similar to have a ported box with a port on both sides vs one port in the middle.
  3. Nope that’s a parallel-tuned 6th order. If someone wants to go down the 6th order road those are actually the least difficult to get right.
  4. Yeah the 12-16 sq in rule is often far from ideal. It doesn't take into account input power or tuning frequency, both of which have a big impact on how much port area you need. For what you want to do, I would go no lower than 25 sq in of port area, and if you could get up to 32-34 sq in that would greatly reduce any port noise/port compression you might have. It will require a pretty long port though. Everything is a trade-off.
  5. I can help you out with a design, you are going to need more space than just 14" H x 32" W x 20" D though. How much bigger can you go?
  6. If you post your max dimensions, I can give you some recommendations and possibly a design.
  7. This is what I would do with that amount of space. Its ~3.2 cu ft net tuned to 32 hz with just under 50 sq in of port area. If this looks good to you I'll give you a cutsheet.
  8. Oh yeah, you can totally work within that space. Let me see if I can come up with something for you. I assume you are going to want to tune to the low 30s?
  9. What are the dimensions you have to work with? Can't say for sure without knowing that. How much power are you going to be running?
  10. Sure, its possible. Its going to be a fairly long port though depending on where you tune to. Layout can be tricky.
  11. So what are you goals for this system? What kind of usable bandwidth are you looking for? Unfortunately ratios are just a really oversimplified way of designing a bandpass box. Its not that they are wrong, its just that they aren't always right. I'm glad you are looking at things in WinISD, its a powerful tool and is very useful for making comparisons between different enclosures. Just keep in mind that the frequency response you are going to get in a vehicle is going to be very different than what WinISD shows.
  12. Good choice, I avoid MDF whenever possible, plywood is just a much more pleasant material to work with, in addition to the weight savings.
  13. Sounds good. Loose polyfill in the sealed side is perfectly fine. Polyfill in the ported side would be very detrimental to output.
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