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REVpuggie

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Posts posted by REVpuggie

  3. Posted

    I Enjoyed the video ,looks loud as f*ck ,but it did not make me want a DC subwoofer , It makes me wanna buy thick steel plates for bracing and sounddeadener though .

     

    merry christmass!

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  4. Posted

    a better box and placing could do a lot for your scores also ... so try playing forward ,up and towards the back

    with routing the port edges and woofercuttout , bracing the box in the right places , smoothing the surfaces stuff like this really helps

    ... did that for a friend of mine last summer and he went from 143.XX to 149.5 in one hours work and putting the wooferbox in the right position on a single 15 inch woofer .

     

    oh .. and how big is that port in that box .if the port is to small its going to hurt output a lot .

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  18. Posted

    -Please refer to it as a single tuned bandpass  unless for some reason you need a 4th order mechanical filter

    -There is no given ratio you can use

    -The enclose will have to be designed as a whole , no rules of thumb, no using the sealed box recomendations

     

    and have a good reason for wanting a single tuned bandpass enclosure for your woofers !

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  19. Posted

    do you have acces to an RTA and someone if not you, that can help you with a measurement ?

     

    seems to to me that your problems are all build related , aiming ald locating tweters , kickbass is very probable a weakness in your doors .

     

    so standing waves and resonances are probably your problem

     

    why not re-evaluate your build and play a little , to me sharpness and detail are not in the same book and most tweeters easily outperform  kick/mid drivers...

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  20. Posted

    Some people have to learn the hard way. Unfortunately in this instance it's harder to learn when even a sub optimal enclosure should be very loud due to small cabin volume, cone area displacement, and power.

     

    Using other peoples' records or measurements of output as supporting evidence for using a 4th other BP makes no sense at all. Their "db numbers" and results are arbitrary.

     

    Forget about enclosure types and alignments, lets just simplify it to enclosure A and enclosure B.

     

    If I tested enclosure A and it was 160dB then clearly it's the best choice right? What if enclosure B would have done 162db, or 160dB over a longer frequency range, but I never actually built enclosure B so I'll never know that. So in reality just because enclosure A is loud doesn't mean it's the loudest or the best unless you've tested other enclosures for comparison.

     

    A lot of the builds for SPL are designed for maximum spl over a small frequency range, they're competing for numbers, not for overall loudness (though that's not always the case). So something built for SPL doesn't mean it's the best choice for music or "daily."

     

    Another thing to consider is there's a big trend of people using 4th order BP and they don't know why they picked that enclosure type other then they heard "joe blah blah did 158 at 35hz" so it must be good, and so they build a 4th order BP. This perpetuates to where all these people are using it and therefore it MUST be good, and yet they haven't tested a standard ported enclosure or ported "Wall" for comparison.

     

    It becomes harder to dissuade people from this mindset when people are using lots of cone area and power for builds because even if you have a shitty enclosure design more than likely it's still going to be pucking loud. "Dude it did a 160db so it works" Yeah but what if it switched to a ported enclosure and it did a 161, then what? There's many ways to accomplish a goal, but they don't all have the same easiness or efficiency.

     

    Here's another analogy because I want this to sink in. You wanted to move a shit load of dirt and you filled up the trunk of a 2004 honda civic to move this mountain of dirt from point a to point b, and it took ten trips, but it worked. The proof that you moved the dirt (regardless of how many trips it took or how absurd it was) is enough to say it's not only a good method, but it's the best method. Now what if someone said "hey why don't you use a pickup truck and do it in one trip?," and you think "well everyone around here uses 2004 honda civics so fuck your stupid pickup truck." You would sound incredibly ignorant to say the least, and that's pretty much how you sound when you're insistent on using an enclosure alignment that you know absolutely nothing about other than other peoples' arbitrary numbers resulting from such.

     

    I'm not exactly saying standard ported enclosures are better than 4th BP enclosures (though I believe 99% of the time they make sense over a 4th order BP in car audio builds), but I'm trying to make you open your eyes or at least question why people think 4th BP are better (scientifically not anecdotally).

     

    Another thing to keep in mind is there is no such thing as a good ratio. The enclosure needs to be designed around the driver's parameters. Attempting to use some special ratio is no different than putting a spare tire from a honda civic on a dodge pickup truck (that happen to have to the same bolt pattern, hey it fits so it should work...). I mean yeah you can technically drive so it "works," but it's not exactly optimal or near the potential of the vehicle's handling abilities.

     

    So yeah if you still don't heed any of the aforementioned advice after reading this than good luck, for only luck will bring you happiness with your latest enclosure.

    +1 I say let him go.it'l sort its self out

    good write up , couln't have said it better !

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  22. Posted

    seems to me you're set on a specific setup , with what exactly do you need help then ?

     

    just ran the z4 woofers through bassboxpro6 and they'll will perform good in all of the above enclosures .. so it will be a matter of taste , common sense and space available

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  23. Posted

    F*CK ratios , and please dont build a single tuned bandpass enclosure fot something that is intended to play in a ported encosure .

     

    most efficient would be ported ... if it meets its goals to build a bandpass try to fit  a series or parallel tuned bandpass .

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