DLHgn

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DLHgn last won the day on November 30 2016

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About DLHgn

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    140db
  • Birthday 04/14/1995

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    Male
  • Location
    San Marcos, Tx
  • Interests
    Home/Car Audio, Computer Science and Mathematics.

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  1. Even if they had, their application may have different results than yours. Just do whatever you feel comfortable with or what makes sense to you. I would build with the idea of being able to upgrade in the future. So, for example, getting subs that can take more power than you're currently running. In the future you can add another amp or upgrade to a more powerful one. Again, just an example.
  2. In an extreme case that seems feasible. OP, what are the specs on your enclosure?
  3. I second playing test tones. That will tell you for sure if/what frequencies are quieter. One thing that could be going on is that your specific car is cancelling out those frequencies but I doubt it. I believe there is a way to test your RCA's out to see if the HU is losing those frequencies. I think it's by using a DMM to measure the output voltage of the RCA's. Play a sweep and see if it dips but I could be wrong.
  4. I'm not sure what happened. The only thing really different is my Re and number of voicecoils. The IS12 has 2 voice coils and I used the dual 2 ohm version but besides that everything else is the same. I actually just noticed my Vas is twice what yours is for some reason. I manually entered the Qes as .59 but the Vas goes to 66.42. If I let the Qes autocalculate it goes to .295 and Vas goes to 33.21.
  5. I was definitely on square port. Maybe it's the parameters of the sub? I could've put them in wrong. Could you screen shot the parameters you have for the sub in WinIsd?
  6. For the sub I used a B2 IS12v3. The link can be found here. http://www.b2audio.com/is All other info is on this spread sheet https://docs.google.com/spreadsheets/d/1KqDTURiuumMMO3uI_UCkyFxEj5t0Y-Vw3-YVsYiSFWc/edit?usp=sharing
  7. I did 11 more test with a different sub and the results change dramatically. The optimal port area now results in a a velocity in the low 30s while the minimum results in a velocity in the low to mid 40s.
  8. Here we go. You should be able to view the link but not change anything. https://docs.google.com/spreadsheets/d/1KqDTURiuumMMO3uI_UCkyFxEj5t0Y-Vw3-YVsYiSFWc/edit?usp=sharing
  9. So here's what i've found. Optimal seems to get port velocities in a range of 23 - 25 m/s. Minimum gets the velocities in a range of 32-33. By no means have I done extensive testing with different situations but I did 12 tests. I can do some more at another time to push the numbers more towards the extremes on both ends. The calculator so far seems to be pretty consistent which is definitely a good thing. Note: Test were done by using Triticum's calculator and comparing the port velocity graph of the Optimal, Minimum and a control port area. If I can find a way to keep people from changing the document I will post a link so y'all can see the actual numbers.
  10. This is awesome. Once I get back home later I will check it out and compare to some simulations in WinIsd and let you know my results. I'm glad you made this. I can't stand the in2 per ft3 rule.
  11. Try playing a low frequency tone on it free air for long periods of time. Like 20hz for a few hours. Just make sure you're not putting too much power to it and that the sub isn't heating up. You want the cone moving quiet a lot for the suspension to start stretching out but it should still have control and shouldn't be reaching it's limits. If the sub has a pole vent I would recommend finding a way to keep it at an angle are to suspend it in the air securely that way the went isn't blocked.
  12. Trying to use my PS3 for the first time in a while and i'm having to download so many software updates. 

  13. Looking good. Those Raven's are so sexy. Hope to one day own one.
  14. Agreed. I want to see what you came up with! I feel that bracing is always my weakest part of a design. I try to put a lot of time into it. Getting better slowly but surely
  15. At the very least I would suggest adding some shelf bracing or laying the bracing flat with the panels. Just something to help stiffen up the panels. It would be great if you could think of some sort of window brace to make.