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Triticum Agricolam

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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. So first off, the effect of upgrading your power would definitely not be negligible. Input power (along with box size) are the two most important factors when it comes to how much port area you need. Tuning frequency is also a factor, but to a lesser degree. As far as being locked in, other than the additional space it takes up, having a larger port than you need has very few drawbacks. While it is possible to get in a situation where you have too much port area, its a lot harder to do than most people think. If you know you are going to be running more power at a later time, design
  2. I'm glad to hear you found the problem. As far as WinISD goes, its very particular about how you enter in the speaker parameters, here is the "right" way to do it. 1. Enter Mms and Cms This gives fs. If either is not available, then enter fs and other parameter. 2. Enter Sd, Bl and Re Now, you should get all but Qms (and Qts), Vas. Please note that Vas may not match exactly what is specified by manufacturer, because exact value of Vas depends on environmental parameters. See FAQ. 3. Enter Rms or Qms. Either one will do, alth
  3. Yes, the sub, the box size, the power level, and the tuning frequency all impact how much port area you need. Some of those things more than others.
  4. So the thing to understand about ports is they are either big enough to do the job, or they aren't. If a port is big enough, going to an even bigger port doesn't really change anything, it just takes up more box volume, but its not going to sound any different. How an enclosure sounds has a LOT more to do with the net volume and tuning frequency than the port size, as long as the port is big enough (this means having enough port area to avoid port noise and compression). Think about it this way, the port on an enclosure is like the intake manifold on an engine. If the manifold isn't
  5. Higher power takes more port area. Since you are running more power you should increase your port area. In my opinion 16 sq in per cube would be the minimum with a 2 cu ft per sub box. If anything I'd be shooting for more towards 20 cu in per cube.
  6. So tuned to the same frequency and appropriately sized, there is NO difference in performance between an aeroport and a slot port. The difference you heard was almost certainly due to different tuning frequencies and/or port areas between the boxes you were trying out. In general, my preference is for slot port boxes because I can get whatever port area I want and they usually make for a stronger box. However, if you want to stick with aero ports, that's totally fine and you can certainly get good results with them too. Two 6" ports would work very well for your setup. They will hav
  7. It does sound like the port/s is the cause of the unwanted noise you are getting. Due to the fact that you are a little undersized in port area anyway, and you are experiencing problems because of this, my recommendation would be to rebuilt the box using a slot port. You will then be able to get exactly the port area you need. If you decide to go this route let me know and I can help you with a design if you need.
  8. For those asking, the watts you should input are the RMS watts your amp is capable of under ideal conditions. So not what you get after box rise.
  9. The noise you are getting could be from a couple things. Your port area is a bit undersized for the power you are running, not drastically so, but still undersized enough that I would expect you are getting some port noise. One way to isolate the problem would be to use a sine wave generator app on your phone and determine exactly what frequency you are getting the noise at while playing at moderate volume. Take caution when doing this since sine wave tones played near your tuning frequency put a lot of heat into your subs. Another possible source of the noise could be a panel vibrat
  10. Heya, I am getting ready to put a sub in my wifes 2014 Kia Sorrento. It has the upgraded infinity sound system but I need a little more oomph. I have a few different subs to choose from. I have 1 Sundown x8v3, 1 Sundown SA10 v2 and 4 Sundown SD4 12-2. I am leaning towards the x8 or sa10 But am not opposed to one of the 12s. I just think I want to build a bandpass box so as to protect it. I am going to be taking the 3rd row seat out and think there is plenty of room to mount a box and amp under there.  I will be using one of my old school amps either a mtx 225 ho or maybe one of my crossfire 30hc's. I also have a Audio Control LC2 with bass knob so I can turn it down when we don't want to bump. What do you think is the best option for my application? I would like it to be stealth as well as protected from groceries, strollers, etc. 

    Thanks for any advice from a fellow Eastern Washingtonian. 

    Jeff

  11. The secret? Having no space limitations. Obviously, space limitations are almost always present. It often becomes a balancing act trying to come up with a design that has the least amount of compromises as possible. Unfortunately I have no easy solutions for you. If you PM me with your specific situation I may be able to give you some suggestions.
  12. What exact Sundown sub are you going to be running? You don't want your port to run along the top the full width of the box. You end up with a super high aspect ratio port that way and they are not efficient. You would be much better off firing the port out the side. You are going to have to go quite a bit wider than 30" to get the internal volume you need, but it doesn't sound like thats a problem? What vehicle is this going in?
  13. Ok, lets assume you are going to go up to ~2.4 cu ft on the sealed side and ~7.5 cu ft on the ported side. With 3K of input power and a 45 hz tuning I would use no less than 120 sq in of port area. As far as your sealed chamber goes, you certainly can have all three subs in the same chamber. One advantage to doing separate chambers for them though would be if you blow one sub your other two subs won't suddenly experience 50% more sealed volume, which could cause them to fail as well. Its not a huge deal though.
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