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  1. #16
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    Re: Vdub sql

    3.7cf@32hz







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    Re: Vdub sql

    Quote Originally Posted by Bassballer150 View Post
    3.7cf@32hz
    Are you going to keep the red port with black carpet?

    And a ported enclosure isn't exactly SQL. A passive radiator set up would have been SQL.

    That is an SPL set up.



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    Re: Vdub sql

    So ported makes it an spl?




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    Re: Vdub sql

    Box will be black/white




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    Re: Vdub sql

    @ciaonzo ;
    Ported is definitely not SQL in any sense.



    Head Unit Pioneer P99RS
    3 Runs of 1/0 OFC Power and 3 Runs of 1/0 OFC Ground
    1 XS Power D3400 & 2 XS Power XP3000 with Copper Bus Bars
    380 Amp & 320 Amp Iraggi Alternators(One is a chevy case, the other ford)
    RD 7500.1 running 2 12 inch SPLaudio (AA Mayhem motors/baskets)
    Tuned to 36 hertz. About 4.5 cubic feet, 8" Aeroport (made by dbeez)
    Zed Audio Leviathan III on Morel MDT-29, RS100-4 & RS225-8 Daytons
    Alex Jones www.infowars.com Endgame, Obama Deception, Truth Rising,
    Fluoride in the water, poison in vaccines, chemical trails in the skyglobal
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    Re: Vdub sql

    Quote Originally Posted by jockhater2 View Post
    @ciaonzo ;
    Ported is definitely not SQL in any sense.
    All your opinion which it seems he didn't ask for...




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    Re: Vdub sql

    Quote Originally Posted by mlstrass View Post
    All your opinion which it seems he didn't ask for...
    Its not opinion though. Ported box are designed to hit a small range of frequencies very loud. While you lose the ability to play other frequencies that are away from port tuning very well.

    Its not an opinion. Its fact. Check out a frequency response curve on a ported enclosure and you will see. His front stage is definitely going to sound great.
    And the bass will too. But he won't be able to play all the frequencies from 20-80 hertz the same. There will be a lot of humps and dips.
    And that is fine. Its just not "SQL"



    Head Unit Pioneer P99RS
    3 Runs of 1/0 OFC Power and 3 Runs of 1/0 OFC Ground
    1 XS Power D3400 & 2 XS Power XP3000 with Copper Bus Bars
    380 Amp & 320 Amp Iraggi Alternators(One is a chevy case, the other ford)
    RD 7500.1 running 2 12 inch SPLaudio (AA Mayhem motors/baskets)
    Tuned to 36 hertz. About 4.5 cubic feet, 8" Aeroport (made by dbeez)
    Zed Audio Leviathan III on Morel MDT-29, RS100-4 & RS225-8 Daytons
    Alex Jones www.infowars.com Endgame, Obama Deception, Truth Rising,
    Fluoride in the water, poison in vaccines, chemical trails in the skyglobal
    elite banks run our government towards a one world global government.

  9. #23
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    Re: Vdub sql

    Well, SQL is a misnomer like that other popular one, substage. I hate both of those 'words' and I refuse to acknowledge them, but I'm lovin' that little DD full range amplifier. I'd like to try one of those at some point.

    It's important to think of vented enclosures and PR enclosures as practically synonymous, but certainly interchangeable. You can achieve identical frequency response plots with both in the pass band, the only exception is the 28dB rolloff with PR compared to 24dB with vented. Other than that, they do exactly the same thing. Each has it's own advantages. PR is a little touchier and a horrid transient response is guaranteed if done wrong. Vented is much more forgiving if tuning is off target.

    To say that you can't have a sound quality setup with a vent is incorrect, you can. You just need to preserve certain things like frequency extension and low group delay within the important thresholds. Another point of interest is the response from 20-80hz. Even if I have an absolutely perfect frequency response profile from 5 to 500hz as measured in an anechoic space, the second I introduce it into the vehicle's interior, that is out the window. The vehicle's acoustics will dominate no matter what. This is why it is ABSOLUTELY essential to have equalization capabilities.

    I'm at work so gotta go for now.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  10. #24
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    Re: Vdub sql

    Quote Originally Posted by ciaonzo View Post
    Well, SQL is a misnomer like that other popular one, substage. I hate both of those 'words' and I refuse to acknowledge them, but I'm lovin' that little DD full range amplifier. I'd like to try one of those at some point.

    It's important to think of vented enclosures and PR enclosures as practically synonymous, but certainly interchangeable. You can achieve identical frequency response plots with both in the pass band, the only exception is the 28dB rolloff with PR compared to 24dB with vented. Other than that, they do exactly the same thing. Each has it's own advantages. PR is a little touchier and a horrid transient response is guaranteed if done wrong. Vented is much more forgiving if tuning is off target.

    To say that you can't have a sound quality setup with a vent is incorrect, you can. You just need to preserve certain things like frequency extension and low group delay within the important thresholds. Another point of interest is the response from 20-80hz. Even if I have an absolutely perfect frequency response profile from 5 to 500hz as measured in an anechoic space, the second I introduce it into the vehicle's interior, that is out the window. The vehicle's acoustics will dominate no matter what. This is why it is ABSOLUTELY essential to have equalization capabilities.

    I'm at work so gotta go for now.
    Bam. I just got schooled. But there is nothing wrong with that I am learning.

    So you can achieve a a good transient response from a vented elcosure? How so?

    Why do you hate the term "sub stage"?
    How do you feel about the terms "SPL" and "SQ"?



    Head Unit Pioneer P99RS
    3 Runs of 1/0 OFC Power and 3 Runs of 1/0 OFC Ground
    1 XS Power D3400 & 2 XS Power XP3000 with Copper Bus Bars
    380 Amp & 320 Amp Iraggi Alternators(One is a chevy case, the other ford)
    RD 7500.1 running 2 12 inch SPLaudio (AA Mayhem motors/baskets)
    Tuned to 36 hertz. About 4.5 cubic feet, 8" Aeroport (made by dbeez)
    Zed Audio Leviathan III on Morel MDT-29, RS100-4 & RS225-8 Daytons
    Alex Jones www.infowars.com Endgame, Obama Deception, Truth Rising,
    Fluoride in the water, poison in vaccines, chemical trails in the skyglobal
    elite banks run our government towards a one world global government.

  11. #25
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    Re: Vdub sql

    Quote Originally Posted by jockhater2 View Post
    Bam. I just got schooled. But there is nothing wrong with that I am learning.

    So you can achieve a a good transient response from a vented elcosure? How so?

    Why do you hate the term "sub stage"?
    How do you feel about the terms "SPL" and "SQ"?
    As I said, the key is group delay. Someday you will sit in my vehicle and have a reference for what a low group delay vented alignment sounds like. Hopefully this year, lol. Basically sounds like sealed with more balls. Here's some copypasta on group delay.


    "Group delay is a measure of how sharply the phase of a signal
    changes from one frequency to the next. If the group delay
    remains low at all frequencies, the bass will be taut and well
    controlled. But if the group delay at some frequencies is much
    higher than 20 ms, the woofer is likely to exhibit poor transient
    response, thickening sounds at those frequences while robbing the
    woofer of clarity and impact."

    Delay audibility mechanisms (this says nothing about the thresholds, just the mechanisms):
    Delay skews perception of second harmonic distortion,
    but amazingly, in such a way that the skew is level dependent. This
    is an artifact of gross delay distortion that can easily be shown
    from a steep filter. It may explain the harshness many people
    talked about with old steep anti-aliasing filters.

    Another point is that the non linearities in the ear itself can lead to
    changes in the transfer from outer to inner ear that are phase, not
    power, dependent. Some monaural phase effects can be explained
    by the concept of the inner spectrum, the spectrum available to
    the inner ear. This is different than the spectrum at the outer ear
    due to non linearities in the middle ear and inner ear. Identical
    external power spectra can lead to substantially different inner
    spectra for different phase angles.

    A third aspect is that reversals of phase for some
    harmonics can create "beats" that change masking thresholds quite
    dramatically, often up to 30 dB. There are some major implications
    here for keeping tweeters and woofers in phase, keeping xover phase
    on a symmetrical basis and NOT just judging success on a power
    basis. Finally, I found a reference describing the threshold for
    localization movement based upon group delay. I have applied it as a
    group delay criteria for maintaining sharp images in multi way
    speaker systems.

    There's also a good paper that looked at the impact of group delay across
    the spectrum, starting with 30 Hz fundamentals. The group delay
    across the board impacted the ability to pick out mid-range detail.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  12. #26
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    Re: Vdub sql

    Quote Originally Posted by jockhater2 View Post
    Bam. I just got schooled. But there is nothing wrong with that I am learning.

    So you can achieve a a good transient response from a vented elcosure? How so?

    Why do you hate the term "sub stage"?
    How do you feel about the terms "SPL" and "SQ"?
    The top SQ car in the worls runs a 4th order. It only plays 20-40hz... Thats it.



    2014 Ford Fusion
    All stock everything.

  13. #27
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    Re: Vdub sql

    Quote Originally Posted by DDtC View Post
    The top SQ car in the worls runs a 4th order. It only plays 20-40hz... Thats it.
    I'd be interested to know how old that judge was, lol.

    Infinite baffle, dipole, transmission line, sealed, EBS tunings... these remind me of reference level playback designs. Fourth order, not so much. Could happen, though. Would need some serious DSP involved.

    What vehicle, BTW?



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  14. #28
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    Re: Vdub sql

    Quote Originally Posted by ciaonzo View Post
    I'd be interested to know how old that judge was, lol.

    Infinite baffle, dipole, transmission line, sealed, EBS tunings... these remind me of reference level playback designs. Fourth order, not so much. Could happen, though. Would need some serious DSP involved.

    What vehicle, BTW?
    Hybrids Infinity



    2014 Ford Fusion
    All stock everything.

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    Re: Vdub sql

    Quote Originally Posted by DDtC View Post
    Hybrids Infinity
    Link? Name? MECA? Throw me a bone, here.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  16. #30
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    Re: Vdub sql

    Quote Originally Posted by ciaonzo View Post
    Link? Name? MECA? Throw me a bone, here.
    Scott Bulwalda- Hybrid audios owner



    2014 Ford Fusion
    All stock everything.

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