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Triticum Agricolam

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Triticum Agricolam last won the day on March 4

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About Triticum Agricolam

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    Eastern Washington State
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    Speaker enclosure design & construction

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  1. help choosing Fi subs

    Depends on where you tune to, but assuming you are going to tune in the low 30s, 33-35 Hz is where the ported box is going to have the most advantage over the sealed options.
  2. help choosing Fi subs

    Below 50 Hz, the two 12"s in a ported box is going to have the most output, by a significant margin.
  3. Need a new DSP on the market

    If you haven't seen it yet, the MiniDSP C-DSP 8x12 gives you eight channels of input and twelve channels of output. It doesn't do everything you want to do, but it does a lot: https://www.minidsp.com/products/car-audio-dsp/c-dsp-8x12
  4. box design help SA12

    When you say "as low as possible", just how low do you mean? Understand that everything is a trade off, you could tune the box to 20 hz and be able to hit very low, but you will sacrifice peak SPL capability significantly. Also, what vehicle is this going in?

    Would something like this work? Its 6.78 cu ft net (DB Drives recommendation) tuned to 33 Hz with 100 sq in of port area.

    Those bigger boxes may not be tuned as low as you think. The bigger the box the shorter the port can be with the same tuning, all else being equal.
  7. 4th order bandpass help?

    So 4th order bandpass boxes do several potentially useful things. They push all the output out the port, which can be very handy for blow throughs and the like. They let you trade efficiency for bandwidth and vice-versa. Making the front chamber volume larger makes its more efficient around the tuning frequency (more output) but it makes the output more peaky (less bandwidth). Reducing the front chamber volume has the opposite effect. Lastly 4th order bandpass boxes let you raise the tuning frequency higher without having to worry about destroying your subs and/or having output fall off a cliff like a ported box would when playing below tuning. This can be handy since most enclosures have a peak in output around tuning and most vehicles have a peak in cabin gain between 40-50 Hz. When you match those two up you can get a lot higher peak SPL number. Since cabin gain boosts low frequency output, sometimes a 4th order bandpass design can get you wider effective bandwidth since the cabin gain boosts output below tuning where the enclosure is naturally falling off. It doesn't always work out well though. Some subs will naturally be more peaky than others in a bandpass box and that's going to make it harder to get a wide bandwidth, it also depends on how much cabin gain you get in your vehicle and every vehicle is different. I'm not trying to discourage you, just trying to make you aware of what the challenges may be. Your HCCA subs are going to be on the more peaky side of things in a 4th order bandpass box.
  8. 4th order bandpass help?

    How much power are you running? Dont worry about chamber size ratios, you are better to size the chambers individually based on what you want the box to do.
  9. Nails vs Screws for boxes

    Brads keep stuff from moving around but they are no replacement for screws or clamps. Brads can’t pull a joint together. I’d spend $300 on clamps long before I’d spend that much on a brad nailer.
  10. 4th order box

    X8s aren't a good choice for 4th order bandpass boxes anyway. SA8s would work. SA10s would work better.
  11. Port noise

    The high aspect ration certainly isn't ideal. I like to keep aspect ratios under 5:1 if possible and 8:1 is my absolute upper limit. Increasing port area can compensate for an undesirable aspect ratio. In the OPs case, he has enough port area it shouldn't be a problem.
  12. Port noise

    That should be enough port area. What's your intended tuning frequency?
  13. So here are a couple things to think about. When you go to buy sonotube it isn't all the size that's printed on the side. A "10 in" sonotube can be anywhere from 9-11" in diameter, so bring your tape measure so you know what it is you are getting. Because of this you can probably find two tubes where one fits pretty well inside the other. I'm not sure I 100% understand what you want to do with the port, but I can tell you this. A 8" tube split in half is going to still have twice as much area as a 4" tube would. If you have the port fire in both directions you will have to double your overall port length because its like having two seperate ports.
  14. Go with what fits your space better. All else being equal I'd probably lean toward two 12"s over one 15".
  15. Sub died, looking for options

    You can easily put 2,000 watts (or more) to a 1250 watt rated sub as long as you are observant. You should have nothing to worry about.