Jump to content

1992Chevy K1500

Members
  • Posts

    1574
  • Joined

  • Last visited

Posts posted by 1992Chevy K1500

  1. The simplest way I've found of doing it is:

    Measure the outside of the box and calculate volume without subtracting wood thickness.

    Then, measure the length and width of each panel. Multiply length x width x thickness and divide by 1728. Once you have the volume of all the panels, subtract the total panel volume from the original volume you calculated without factoring in wood thickness.

    Or use an online calculator. Your choice.

  2. There's usually a small (tiny, hell, you can't see it without glasses, even if you have 20/20 vision!) tab on the drive. It slides. Use a magnifying glass and look to see if it's in the locked position (has a pic of a closed lock embedded on it).

    Trust me, when it's engaged, you can't reformat it for anything.

    And thanks for the heads up. Nothing on mine though. My external devices only have 1 computer, Mine! :)

  3. Ive had a sound problem with my Laptop for a while now.

    When playing music it will have loud popping sounds. I first noticed in when i hooked it up to my system in my car to use a tone generator to test things. It does it on the laptop speakers, but harded to notice since its a lower frequency pop, and it does in when i plug an aux cord to other speakers.

    anyone know whats wrong?

    Sounds like the output might be a pure square wave (way worse than clipping). What frequencies?

  4. If you fail, try again UNTIL you succeed.

    Ubuntu is a "beginners" linux as is most liveCD distros. I personally use PcLinuxOS, when I'm not in win7ultimate.

    but linux is linux, all commands are the same (as far as I think).

    Sorry I couldn't be of any help. Trust me though, after you keep trying you'll figure it out and go, "That was too fracking simple, no wonder I screwed it up".

    So you're telling me the average linux user "breaks" 3 installs of the same OS in 2 month.

    Yes, I did "break" them. I tried to install some software to turn mine into a PVR, and linux quit and wouldn't boot up after that. A re-install of the OS fixed it, but then it happened again. and again. And it was software that hundreds of people have used many times before and I was the only one to f*** it up.

    Why?

    Because I fail at Ubuntu.

  5. Even though this would hardly ever be accurate. unless you were able to get cabin volume, frequency, vehicle flex and random little things in it, but would still be off

    but.. what should get done is have the formula posted for all the little noobies that come on and ask if i got 2 btls on my hifonics 2010, what db do you think ill hit?? they wont think anythin of how it could be wrong hah

    LOL.

    Unfortunately, that's the problem. I figured it out in my sleep. Basically, you need to include the following:

    vehicle interior space, distance between the subs and the mic, number of woofers, cone area, xmax of subs, area of the mic's diaphragm (or whatever it is that measures pressure), area of the opening to the diaphragm (assuming it's in a nearly sealed box with one small hole in it; hard to explain, but it's important), location of the port, port area, internal box volume, objects that might reflect the sound pressure from the mics (seats, possibly dash, etc.), any air leaks (no matter how small), how many air leaks, location of air leaks, how much air moves through the air leaks in a given time, temerature, moisture content (air is easier to compress than water), power going to each sub, and any potential flex.

    A lot more than I originally thought. :o

    Thanks for the input though, it helped.

  6. +/- 5dB is the difference between me having a 150 or barely being able to do the 39.9 bass race class so I don't think your formula will be quite as accurate as you think.

    still pretty interesting to figure out your own formula... props :good:

    Thanks man.

    And I know it's not that accurate, but that's the maximum error I'm going to allow myself in the final formula.

    I'm going to sleep on it and work some more tomorrow.

    thanks for all the replies, they've been helpful.

  7. use my car as a proof

    3 18's, 4500wrms, 148.7 db best

    theres so much more than cone area and power that figure in to the output. an 8th order can have 15-20db of gain over a sealed box once the transfer function of a car is worked in. even a ported box can make a 10-15db difference.

    Cool. I'll try.

    No prob. I would be interested in seeing ur formual tho, being a phys/math person i might be able to help....one thing u could do is derive an equation on how much preasure it takes on the diaphram on the mic sensor to create a certain spl level...but the actauly power/cone area to creat that preasure is deff somethign no forumla can explain

    I'll have to post a scan of the paper I'm using tomorrow.

    Thanks for the help.

×
×
  • Create New...