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Reload Thread: deeper bass in a 28 hz ported box vs sealed?

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    BulldogSr04's Avatar
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    deeper bass in a 28 hz ported box vs sealed?

    I have a 12" XXX on a hifonics 1500 in a .9906 ft^2 box (yep i got it that exact to re's specs) and i was wondering if it would his the deeper bass notes better in a 2.1 cu ft vented enclosure tuned to 28 hz.
    thanks
    alex







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    Re: deeper bass in a 28 hz ported box vs sealed?

    for the most part sealed goes lower than ported.



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    Re: deeper bass in a 28 hz ported box vs sealed?

    but ported goes louder! And my 2.7ft^3 box tuned to 28hz gets pretty LOW!




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    Re: deeper bass in a 28 hz ported box vs sealed?

    Quote Originally Posted by CELLERBR
    but ported goes louder! And my 2.7ft^3 box tuned to 28hz gets pretty LOW!
    louder BUT not lower.



    1992 cocaine white Acura Legend ***TOTALED 9/2009****
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    Re: deeper bass in a 28 hz ported box vs sealed?

    No sealed will go lower this is true!




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    Re: deeper bass in a 28 hz ported box vs sealed?

    well i tried messing around with it on winisd but hell i dont know how to work it. does anybody know how to convert everything into the metric that it uses? i used a converter off of a website and it makes the box look like it doesnt even hit that frequency.




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    Re: deeper bass in a 28 hz ported box vs sealed?

    omg sealed is sooo low. when we first installed my subs in 5 cube box we put in a cd of snoop, and some tupac ..... it was pretty ok .... ****** on metal ... i was pissed. i put my test tones in and skipped to mid 30s and HOLY COW!!! it hit the 32ish SWEEEEETTT it literally went inside my ears like 2 120w7s. it didnt really vibrate b/c of the lowww note but it was sooo low i cant believe it. anyways, sealed is LOWWWW ported is hella SPL geared but muffleslows and sounds ****** if tuned to high and your lows try to play.

    if u go ported try for subsonic filtering setting if the amp has them. my old perfomrance teknique did.




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    Re: deeper bass in a 28 hz ported box vs sealed?

    well i heard that the peak for a ported box is 5-7 hz above the tuning freq. that would make it 33-35 hz which is really low and i just want it to get louder on those frequencies while retaining most of the other sound. what would you recommend?




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    Re: deeper bass in a 28 hz ported box vs sealed?

    ported box is an avg of 3db louder above tuning, than a sealed box...

    a typical .707 sealed box will play flat to around 10hz without a problem this is due to the cabin gain below 60ish hz..

    a ported box rolls off at 24 db / octave below tuning.. factor in the 12db / octave gain from the cabin.. thats a 12db rolloff below tuning..

    28hz tuning would yield more output than a sealed box down to around 24hz.. which would cover 95% of music out there..

    so for rap, rock, metal, etc.. a ported box will outperform a sealed.. big time

    Loyd L.



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    Re: deeper bass in a 28 hz ported box vs sealed?

    sounds like im gonna design a ported box then. i heard it from the master. thanks loyd




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    Re: deeper bass in a 28 hz ported box vs sealed?

    Ported will always have a lower F3 for any given alignment, but the big issue is powerhandling.

    Below tuning, powerhandling and control drop off rapidly in ported boxes, whereas sealed boxes have a fairly linear increase in excursion. (This also depends somewhat on the driver and alignment used, but there is no point where excursion dramatically increases)

    For musical purposes, ported boxes are usually unnecessary in a car, as most subwoofers can get far, far louder than the front stage, even when sealed.

    If you prefer bass with music in the background (many people do, oddly enough), then you may want to port.

    Personally, I feel porting in the car environment is pretty much unnecessary, and often counterproductive, for balanced sound...




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    Re: deeper bass in a 28 hz ported box vs sealed?

    Quote Originally Posted by Warbleed
    For musical purposes, ported boxes are usually unnecessary in a car, as most subwoofers can get far, far louder than the front stage, even when sealed.

    If you prefer bass with music in the background (many people do, oddly enough), then you may want to port.

    Personally, I feel porting in the car environment is pretty much unnecessary, and often counterproductive, for balanced sound...
    But what about linearity?

    That sealed sub is going to have to move much farther and have a greater risk of losing linearity to match the output of a ported sub.

    Less linearity=more distortion.............OH NO!




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    Re: deeper bass in a 28 hz ported box vs sealed?

    Quote Originally Posted by k-mart
    But what about linearity?

    That sealed sub is going to have to move much farther and have a greater risk of losing linearity to match the output of a ported sub.

    Less linearity=more distortion.............OH NO!
    That's also true. In terms of THD, the ported box will be lower than sealed above tuning, because it will also typically have less excursion.

    However, that doesn't do you much good if you have huge response peaks, which are essentially distortion as well...




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    Re: deeper bass in a 28 hz ported box vs sealed?

    Quote Originally Posted by Warbleed
    That's also true. In terms of THD, the ported box will be lower than sealed above tuning, because it will also typically have less excursion.

    However, that doesn't do you much good if you have huge response peaks, which are essentially distortion as well...

    Tune low..............problem solved.........then there's also such things as EQ and turning the **** thing down.......




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    Re: deeper bass in a 28 hz ported box vs sealed?

    This is an excerpt of a related topic I read eslewere that I thought was interesting:

    If ported enclosures were not effective at SQ, why would B&W, Definative Technology, Morel, Dynaudio, Scanspeak, etc use them? The sound will only be as good as the enclosure. Generally, you will want to tune the enclosure deeper if you want a smoother response from the subs. The primary shortcoming with vented enclosures is they are usually tuned way too high. At the tuning frequency, plus about 1/4-1/2 octive above it, you will get a peak in the output response, along with a peak in group delay ( the hesitation of the speaker), and phase and inmedance peaks, which all work together to gain eficiency at the tuning frequency. This is not a bad thing by itself, but below the tuning frequency, the acoustic output of the enclosure falls like a stone, and the pressure used to regulate the woofer's excursion is absent, causing the sub to loose all control and bottom out.

    I am the biggest sealed enclosure fan out there, but I weighed the numbers and decided to go with a vented enclosure for my van. My enclosure is tuned to 21 Hz, thus eliminating most of what is wrong with the average vented enclosure. All the peaks and phase and delays are below what 90% of the music out there can deliver, so the response os smooth down to 20 Hz, with a nice gain starting at 70 Hz, and progressively getting louder as the frequency drops. This is a good thing. The lower the frequency, the more energy that is required to reproduce the frequency. Having an acoustic peak at 20 Hz means I can listen to any frequency at any volume, and the sound is smooth and clean. A sealed box simply cannot do that. It would be cleaner, due to the lack of efficiency ( efficiency and fidelity are inversely proportional), but the output would be nowhere near the vewnted box performance. And yes, the box is extremely clean.
    This is where the box construction comes into play. The more the box vibrates, the less output and the less fidelity you will get from it. The vibration of the enclosure is basically like a huge panel driver playing out of phase with the sub, reducing the overall output, and adding resonances (all materials do this when they vibrate), causing inter-modular distortion, which is no good. If you go sealed or vented, that choice is yours. You can get excellent SQ from either, and you can screw the enclosure up and make either sound like *** as well. I don't see that happening.




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