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  1. #31
    keep_hope_alive's Avatar
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    Re: How do I get bass out of my door speakers?







    top hole




    now that the holes are closed up, remove the foam on the door panel





    have you been helped by me? i'd love to know. shoot me a PM.

    *My 2001 Accord build log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/536049-2001-accord-ex-sedan-its-long.html]
    *2005 Scion tC Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html
    *1998 Astro Van Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/567468-kha-does-spl-build-1996-astro-van.html




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    Re: How do I get bass out of my door speakers?

    to prevent noises with the panel on the deadener, we covered the door with CCF and also foamed each panel clip






    repeat on the passenger side




    finished





    have you been helped by me? i'd love to know. shoot me a PM.

    *My 2001 Accord build log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/536049-2001-accord-ex-sedan-its-long.html]
    *2005 Scion tC Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html
    *1998 Astro Van Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/567468-kha-does-spl-build-1996-astro-van.html

  3. #33
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    Re: How do I get bass out of my door speakers?

    @keep_hope_alive ;
    Why on earth would you do 100% coverage off cld. Such a waste.....

    Sarcasm......



    "When I listen to a stereo loudspeaker playback in my room and an auditory scene has formed in my mind, how would I know that what I hear is an accurate replica of an auditory scene that could be had at the recording venue? Or more generally, that this is an auditory scene that could have existed at all?"


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    Re: How do I get bass out of my door speakers?

    all three cars have awesome midbass response. you can see/feel your pants move.
    all have front components that cost $500-$900. But $100 speakers would sound great in these doors.
    all have external amplifiers on the speakers for plenty of clean power.
    All have a combination of deadening, fiberglass bags, foam weatherstripping, and are fully sealed.

    Deadening:
    The van has 8 sq. ft. per door.
    The accord and scion have closer to 20 sq. ft. per door.

    The front doors are responsible for most of what you hear, and should receive more attention than anything else in the system. To duplicate this, you should budget 10 hours per door, start to finish. Can be done in half that time if you already know what you are doing.

    some people say 25% deadener coverage is all you need and more than that is wasting it. i know a few acoustical engineers that would disagree with their marketing attempts. "buy my product and use less". Fact is, patches create multiple resonance modes. The industry tests damping and resonance by knocking on the panels. knock until the entire panel is dead and you have achieved your goal. ideally, you would add enough mass and damping to lower the resonance frequency to be below the speaker range. simply adding layers of wood to the inner door would come very close to achieving that goal. 2" of wood is pretty dead. also, besides making the car very, very dead. 100% coverage also greatly improves transmission loss (blocks noise).

    CCF is just to isolate the door panel from the door metal. could just be done where the panel contacts the door. instead of CCF, you could use fabrics like felt or fleece. buzzing isolation is just soft stuff between hard things. pretty simple.

    closed cell foam doesn't absorb or block much sound (highs get blocked). open cell foam barely absorbs sound and doesn't block sound either. the next step is Mass Loaded Vinyl (MLV) for road noise blocking. but door seals themselves and the glass are larger sources once you do the above.



    have you been helped by me? i'd love to know. shoot me a PM.

    *My 2001 Accord build log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/536049-2001-accord-ex-sedan-its-long.html]
    *2005 Scion tC Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html
    *1998 Astro Van Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/567468-kha-does-spl-build-1996-astro-van.html

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    Re: How do I get bass out of my door speakers?

    Quote Originally Posted by keep_hope_alive View Post
    all three cars have awesome midbass response. you can see/feel your pants move.
    all have front components that cost $500-$900. But $100 speakers would sound great in these doors.
    all have external amplifiers on the speakers for plenty of clean power.
    All have a combination of deadening, fiberglass bags, foam weatherstripping, and are fully sealed.

    Deadening:
    The van has 8 sq. ft. per door.
    The accord and scion have closer to 20 sq. ft. per door.

    The front doors are responsible for most of what you hear, and should receive more attention than anything else in the system. To duplicate this, you should budget 10 hours per door, start to finish. Can be done in half that time if you already know what you are doing.

    some people say 25% deadener coverage is all you need and more than that is wasting it. i know a few acoustical engineers that would disagree with their marketing attempts. "buy my product and use less". Fact is, patches create multiple resonance modes. The industry tests damping and resonance by knocking on the panels. knock until the entire panel is dead and you have achieved your goal.

    CCF is just to isolate the door panel from the door metal. could just be done where the panel contacts the door. instead of CCF, you could use fabrics like felt or fleece. buzzing isolation is just soft stuff between hard things. pretty simple.

    closed cell foam doesn't absorb or block much sound (highs get blocked). open cell foam barely absorbs sound and doesn't block sound either. the next step is Mass Loaded Vinyl (MLV) for road noise blocking. but door seals themselves and the glass are larger sources once you do the above.
    Thanks for a very thorough response kha



    "When I listen to a stereo loudspeaker playback in my room and an auditory scene has formed in my mind, how would I know that what I hear is an accurate replica of an auditory scene that could be had at the recording venue? Or more generally, that this is an auditory scene that could have existed at all?"


  8. #36
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    Re: How do I get bass out of my door speakers?

    sorry to resurrect an old thread but this is a very awesome thread with great info.

    Got some spare time tomorrow so I'm gonna take off the door panels tomorrow to work on rear wave absorption with fiberglass insulation tomorrow and i got a question,
    @keep_hope_alive ; where do you get your 1 millimeter plastic sheet for cheap? all the packages they have at home depot are around 35-60 dollars each... and have a long delivery time Can 2 or 4 or 6 millimeter work? Or is it going to cause plastic noise or even reflecting waves? Also what do you use to seal the plastic sheets into bags? would this be fine? http://www.walmart.com/ip/iTouchless...-Pack/10247581

    EDIT: How about two layers of the plastic food wrap? Would that work? i have a ton of those at home.



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  9. #37
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    Re: How do I get bass out of my door speakers?

    my local hardware stores have painters drop cloth in 1mil thickness for $3.

    and yes, grocery bags would also work. thinner is better.



    have you been helped by me? i'd love to know. shoot me a PM.

    *My 2001 Accord build log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/536049-2001-accord-ex-sedan-its-long.html]
    *2005 Scion tC Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html
    *1998 Astro Van Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/567468-kha-does-spl-build-1996-astro-van.html

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