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Raptorman last won the day on June 29 2013

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About Raptorman

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  1. It's completely necessary. It's the most necessary thing to test IMO. Unless this isn't a mobile audio forum and our ears don't perceive pressure-levels and only perceive impedances lol.
  2. Now, post up in-car response graphs of each. That's what really matters
  3. After you test the 32hz rear port then bring it down to the mid to high 20's where people realistically tune rear ports for 6th's. Smaller rear port is better. Tested it in many different cases myself multiple times. Any data is good data though.
  4. Yeah that looks pretty good to me. But that would require doing what you've explained. Not a realistic option for someone in my sort of business. Would work awesome for someone trying to build their personal setup though.
  5. Now put it in the vehicle where it actually matters. Of course it will be accurate in an open environment.
  6. Yes it does. I have tons of notes as well testing 20-50 at the headrest with windows down for every change ive made to my 6th. I have yet to see Winisd model up an accurate graph for any enclosure that I have designed/built. (I've designed over 3,000 enclosures alone) Ported doesn't get as low as it says, it doesn't spike as hard as it says. It doesn't extend into the upper frequencies in a flat response as much as it says. It doesn't account for cabin gain, stiffness of panels within the vehicle, port areas, window configurations, box positions, etc. 4th bandpasses are especially hilarious because a 4th that plays 20-60 completely flat in the real world has a huge freaking spike at tuning with virtually no bandwidth. Those graphs crack me up lol
  7. This has been covered already. Post 'em up man. Would love to see the graph vs real world response!
  8. they can work for us. Just not the best option IMO. I hate having two exit ports, can cause some funky loading/cabin pressurization.
  9. For car audio, you will want to work with series. Parallel doesn't fit in very well for us IMO. And series is much easier to get right.
  10. It's right. And pay ZERO attention to the graphs in winisd or any other program. They are utterly useless. All you should use winisd for is vent mach and tuning.
  11. Throw "ratio" out the window. (for the most part) Go for the ratio that gives you the proper port tunings, port areas, port lengths, and chamber volumes. Rear tuned low, small port area, smaller volume. Front tuned high, tuned double the rear tuning, large port area, bigger volume. I say for the most part because I've found that anything below 1.5:1 is in most cases not an optimal enclosure, and the box starts to get very cramped and it gets tough to lay everything out efficiently.
  12. Kevin Ross of Juicebox has done some cold weather testing. Let a 40AH battery sit in 10 degree weather for 1 hour and then did load testing on it. Seemed to do well. There's multiple videos. Same chemistry as JY/Limitless/etc. Lifepo4. Different cells being used, though, which will probably make things differ slightly from battery to battery but gives you an idea.
  13. They will work in cold temperatures but prefer higher temperatures. The cells used in the JY's perform best around the 120*F range. As you draw current through the battery it will warm the cells up and will perform better. This is observed in my 2:00 bassline during the recharge tests where in the beginning I am dropping to 12.3 lowest and by the end of the 2:00 it's CLIMBED up to the 12.8 area.
  14. Yeah there is a lot of hearsay and misinformation in the lithium and battery game in general, hell just car audio as a whole. Lol. If it means anything to you, the alternator setup in my video is a Singer 300 and a stock Alt. So about 390A of revved output on tap. And about 260A of idle output on tap. And you see how little it was actually drawing. Alternators weren't being killed. That is after 2:00 of a sustained bassline dropping the battery into the low-mid 12's. The people I have seen say lithium killed their alts are the people who have ran XS Power... And coincidentally I have seen lots of cases of XS Power lithium batteries miserably failing to perform and dropping voltage bad. Which of course would cause the alternators to work harder. Food for thought.
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