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Triticum Agricolam

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Triticum Agricolam last won the day on September 13

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About Triticum Agricolam

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    170db

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  • Gender
    Male
  • Location
    Eastern Washington State
  • Interests
    Speaker enclosure design & construction

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  1. I'm excited to see what comes of this!
  2. Box I’m about to build for low lows tuned 21hz 1 15

    You are correct that lower tunings will have lower port velocity compared to a higher tuning, but are you aware of how much lower? In your case it won't be enough. Here it is in WinISD: The green line is your Skar 15 in a 4.16 cu box, tuned to 21 Hz, with a 6" round port. The yellow line is the same thing tuned to 32 Hz, for comparison. As you can see the port velocity is less with the lower box, like you said, but its still WAY TOO HIGH. You need to be under 30 m/sec, and even lower would be better. Now if you still want to debate with me why you think I'm wrong, that's fine. But I'm only going to participate if you are able to come up with some actual evidence to support your opinion, and by evidence I mean measured results.
  3. Box I’m about to build for low lows tuned 21hz 1 15

    The problem is your port velocity won't be low. It will be over 50 m/sec, you will be throwing 2/3rds of your amp power away to port compression. As far as all the examples you posted, there are two problems. The first is we don't know the specifics of those installs (box size, tuning frequency, input power, etc), so I can't say whether they have enough port area or not. The second problem is just because they are getting good performance with what they have doesn't mean they wouldn't get a lot better performance if they ran more port area. Maybe they would, maybe they wouldn't, again without knowing the specifics no one can say. Its your build, do what you want, I really don't care. I'm only telling you this stuff because I'm trying to help you. Its up to you whether you take my advice or not. I've personally done a fair amount of port optimization testing where I used a calibrated mic to actually measure output and what happens to it when you don't have enough port area. But if you would rather rely on the ear-o-meter or how hard a shirt flaps in a youtube video, good luck with that. If you want to see the testing I've done you can see it here: https://www.stevemeadedesigns.com/board/topic/204068-port-compression-and-optimization/
  4. Thats pretty sweet man. I like what you did with your interconnect wires between the coils, very unique.
  5. Box I’m about to build for low lows tuned 21hz 1 15

    Your port isn't big enough for the amount of power you are going to run. You are going to lose significant output below 25 Hz.
  6. Box I’m about to build for low lows tuned 21hz 1 15

    What sub and how much power?
  7. Recommended L7 Enclosure and Help

    43 Hz is tuned fairly high by most people's standards, that doesn't mean its wrong though. It depends greatly on the type of music you listen to and how you like your system to sound. With that being said, its better to error on the low side with tuning. If possible you might look into having a box made with a removable or adjustable port so you can change the tuning to suite your needs. $250 for a box isn't unreasonable for a well designed and built box. For that price you should expect to get something pretty good though. Ask to see examples of the builder's previous work.
  8. To set gains properly you need a way to detect clipping. A DD-1 or o-scope are the usual ways to do that, though there are others. Without being able to detect clipping you are just guessing.
  9. Enclosure help

    You will be giving up a LOT of performance below 50 Hz in a sealed box vs a ported one, but you do what you have to do to make it fit. My preference would be for a small ported box, even if you could only get 1.5 cu ft net. If you are going to build inside the trunk, the hard part is getting all the joints tight while the glue dries. A Kreg jig is VERY useful for helping you do that. You can get the basic one off Amazon for as little as $20. Harbor Freight has one too for a bit more. Usually the best thing to do it assemble the box outside the trunk using only screws, making sure everything fits together correctly. Then you take the screws out and assemble it inside the vehicle with glue.
  10. In theory, two subs on half power would be equal to one sub on full power. In practice the two subs will probably be slightly louder due to less power compression, etc. In your situation, I'd just wire the two subs to .5 ohm and make sure your gains are set properly.
  11. Single 12" box ideas, need some input

    3/4" acrylic should be plenty strong enough. How much power are you going to be running and what size is your port?
  12. Port Length & End Correction ????

    180 degree bends are more disruptive to the airflow than 90 degree bends are.
  13. Sundown zv4 15 rev2 d2 in a 4th order help??       I'm trying to figure out what sqft I should go with on the ported and sealed side and how many sqin's my port should be and what to tune it to for a good musical daily box?? I've been told to do a 3:1 1.75sealed and 5.25 on ported tuned to 40hz then I was told to go with 1.5sealed and 4.5ported tuned to 32hz by 2 different people?? The tuning seems completely different from each other and I would just like to get it right the first time around or at least close. Any info would be greatly appreciated, thanks!!

    1. Joe f

      Joe f

      I forgot to mention it's running off a shark 3500.1 @1ohm and the box will be in a extended cab f150.

    2. DLHgn

      DLHgn

      You would be better off posting a new topic. 

  14. best port design spl competition

    The length is going to depend on what tuning frequency you end up wanting to go with and how the port is implemented within the box. As far as tips, the thing to keep in mind is that around tuning almost the sound energy is coming out of the port. That sound energy is coming out in the form of air movement. Everything you can do to allow that air to move into and out of the port as easily and smoothly as possible is going to be beneficial. Things like rounding over the ends of the port, making sure everything is smooth, etc.
  15. best port design spl competition

    OK, so assuming the net volume ends up around 16 cu ft and the tuning around 32 hz you would want ~240 sq in of port area.