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Joe X

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Joe X last won the day on December 5 2018

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  1. Joshk started following Joe X
  2. LoudPackRacing started following Joe X
  3. Joe X
    The following are the modeling curves for a sealed box inside some car: Output in dB (normalized) inside a car: An then impedance: As you can see at about 36Hz impedance is close to 30 ohm up from close to 4 ohm at the extremes. You would expect a heavy dB loss around 36Hz due to the high impedance, right? But as you can see that doesn't happen, not at all. Not even a little bit. And this is not power (W) but output (dB) which are not the same.
  4. Joe X
    If you worry about your drivers heating inside the sealed box you can always mount them backwards so that the motors are outside the box for better cooling.
  5. Jeff E

    Hey Joe I have a Chevy Express 1500 van so rooms no problem I have a DC Level 4m3 15 inch sub on a Rockford bdcp 1801rms what's a good sub box design I seen your design for 2 subs can u do it for 1 sub I really would  appreciate it if u can thanks!

  6. Joe X
    Probably you can do two sealed or one ported but not two due to all displacements, get a copy of Torres calculator to figure out your net internal volume of a particular design. Link to Torres calculator: https://bit.ly/Tvj3gB
  7. Pappa14 started following Joe X
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  9. SNYPER

    Hey Joe you still around? i sent you a pm i sure hope so....

  10. Ineedhelp34

    Hey joe, ive been reading in some forums that you are good at box designs, any chance i can get some help on a design?

  11. jettm

    Hey, I was scrolling through looking for box designs for a 12” Rockford P3D2 subwoofer ported enclosure and noticed you and one other member talking as you helped me make a helluva box. I was wondering if there was any way you could help me come up with a design, I really liked the design you and the other guy came out with too. I want it tuned to 34-35hz. Thanks!

  12. tyma1026 started following Joe X
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  14. SNYPER started following Joe X
  15. Joe X
    This was better in the enclosures section I think, Do a box sub / port up to sundown specs to avoid rattle.
  16. Joe X
    Give unclipped 750W RMS to this sub and it will work without issues if your box is properly designed, NEVER forget to engage your amp's subsonic filter to 28-30Hz.
  17. Joe X
    Yes, the pic is just an assembly guide, the extension is so small that you could just not do it.
  18. Joe X
    Can be done like this, subs /port firing forwards/backwards, power: to subs rated: 45s are done as follows:
  19. Joe X
    The BRZ1200 has an output to feed a second amp so you can do that. You will need to gain match though.
  20. Joe X
    I would setup the software for ported.
  21. Joe X
    If you are looking to save space then yes at least two 8"s, two 10s will give you about 43% of extra cone area and will only cost you about 0.8 cubes of extra of net volume. Depends on your goals.
  22. Joe X
    You have space for 12s back there, I wouldn't do 8s more so if you are thinking of upgrading later.
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