Closed Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 20

Reload Thread: Port placement????

  1. #1
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama



    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Port placement????

    Does it matter where the port is placed on the box?

    Not a normal SUV style box, but a full wall.

    Im thinking 4 18's, so would I be best to do a box-style slot port in each upper corner? Or put the subs to one side and run a port all the way down the drivers side? Or maybe a huge port in the center of the box. All ideas are easily built, but I want to know whether it will make a difference in sound.

    This is not going to be a huge powered system, so there is no real need for 400in of port. I was thinking maybe a 5x40 on one side, or a 10x10 in each corner. I am kind of confused.

    I can go up to 24ft3 easy, so space isn't really an issue with port length.



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals





  2. #2
    azimuth's Avatar
    azimuth is offline funded*by*soros



    Join Date
    Mar 2006
    Location
    Denver, Co
    Age
    39
    Posts
    9,053
    Post Thanks / Like
    Images
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    9 Post(s)

    Re: Port placement????

    it doesn't matter where they are, as long as they match each other in size, and length, and are tuned right.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

  3. #3
    azimuth's Avatar
    azimuth is offline funded*by*soros



    Join Date
    Mar 2006
    Location
    Denver, Co
    Age
    39
    Posts
    9,053
    Post Thanks / Like
    Images
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    9 Post(s)

    Re: Port placement????

    and you will still need port area regarless of power. it's depends more on internal box space.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

  4. #4
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama

    Threadstarter


    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    I know the "rules" of port area vs. volume.

    But, in my experience, low powered systems seem to have flatter response with a port that is a tad too small. All my builds are for daily use. I listen to older rap and country, and use my epicenter alot. My concern is the 25-40hz range, any higher is taken care of by a pair of sealed Memphis PR10, bandpassed from 50-125hz.

    My big wonder is: 4 very sensitive 18's or 15's playing only 25-45 hz, do I really need a massive port? Im not trying for a hair trick. I just want to look "cute", but not overplay my mids. I want to roll an extremely flat curve, maybe increasing from 35 and lower. I want a rumble.

    Maybe, I would better served with a sealed box?

    Here is reasoning to low power: I am limited to 550rms @ 1ohm, and 1100 @ .5ohm. My amp will play at full volume all day at .5ohm without overheating. I am still debating on my subwoofer choice, as nice, cheap, low requirement 18's are hard to find.



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals


  5. #5
    azimuth's Avatar
    azimuth is offline funded*by*soros



    Join Date
    Mar 2006
    Location
    Denver, Co
    Age
    39
    Posts
    9,053
    Post Thanks / Like
    Images
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    9 Post(s)

    Re: Port placement????

    Quote Originally Posted by kush-divinity View Post
    I know the "rules" of port area vs. volume.

    But, in my experience, low powered systems seem to have flatter response with a port that is a tad too small. All my builds are for daily use. I listen to older rap and country, and use my epicenter alot. My concern is the 25-40hz range, any higher is taken care of by a pair of sealed Memphis PR10, bandpassed from 50-125hz.

    My big wonder is: 4 very sensitive 18's or 15's playing only 25-45 hz, do I really need a massive port? Im not trying for a hair trick. I just want to look "cute", but not overplay my mids. I want to roll an extremely flat curve, maybe increasing from 35 and lower. I want a rumble.

    Maybe, I would better served with a sealed box?

    Here is reasoning to low power: I am limited to 550rms @ 1ohm, and 1100 @ .5ohm. My amp will play at full volume all day at .5ohm without overheating. I am still debating on my subwoofer choice, as nice, cheap, low requirement 18's are hard to find.
    i would stick on the lower end of the rule. 10-12 sq. inches per foot. i agree that you won't need 16 inches per square foot, but i would at least do 10 still.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

  6. #6
    RAM_Designs's Avatar
    RAM_Designs is offline SketchUp Master



    Join Date
    Feb 2006
    Location
    Rockwall, TX
    Age
    29
    Posts
    21,044
    Post Thanks / Like
    Images
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    440 Post(s)

    Re: Port placement????

    You're doing 4 18's walled, yet you don't want it to overpower a pair of 10's you have playing midbass? If I were you I'd get an IXL18, put it in a big ported box tuned to the low 20's, and build your own 4th order LP crossover to where you want it to be since most amp's LP crossovers aren't very steep and still let some higher frequencies in.



    1,400+ designs since March 2011...
    I have my PM's turned off, please email at [email protected]

  7. #7
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama

    Threadstarter


    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    The 18's will NOT be fully driven. They are more for a "show effect". And for solid response down low. I am not even looking to break into the 140's. If that clears it up.

    This is an odd project, that I am sure none of you will understand without seeing firsthand what I need.

    Thank you for the answer on 10-12 in per foot. That is close to what I had in mind. I was thinking 16-18ft, with 200in of port.

    This is simply a pretty project, with a stained birch face to match my CB rack and my rear console I made. The rear will all be invisible to lookers, as I have tinted ALL my windows with 2 layers of Optic Technologies 3% limo over a layer of 35% silver mirror. It is quite dark


    I just want to do 4 18's, and I am not worried with SPL by any means, just a very clear low end extesion down in the 20's.



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals


  8. #8
    azimuth's Avatar
    azimuth is offline funded*by*soros



    Join Date
    Mar 2006
    Location
    Denver, Co
    Age
    39
    Posts
    9,053
    Post Thanks / Like
    Images
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    9 Post(s)

    Re: Port placement????

    Quote Originally Posted by kush-divinity View Post
    The 18's will NOT be fully driven. They are more for a "show effect". And for solid response down low. I am not even looking to break into the 140's. If that clears it up.

    This is an odd project, that I am sure none of you will understand without seeing firsthand what I need.

    Thank you for the answer on 10-12 in per foot. That is close to what I had in mind. I was thinking 16-18ft, with 200in of port.

    This is simply a pretty project, with a stained birch face to match my CB rack and my rear console I made. The rear will all be invisible to lookers, as I have tinted ALL my windows with 2 layers of Optic Technologies 3% limo over a layer of 35% silver mirror. It is quite dark


    I just want to do 4 18's, and I am not worried with SPL by any means, just a very clear low end extesion down in the 20's.
    i must be missing something. if you already have the 4 18's, why not make it pound? i understand that spl isn't what you're going for, but if you build the box right, it'll still pound really hard, even on lower power. you could probably screw it up bad and still make 140.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

  9. #9
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama

    Threadstarter


    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    Ah, no I don't have the 18's, I am looking for some. No one around here has ran 18's since the mid-90's. Everyone is on the Memphis scene, running 1 or 2 PR12 off of a Walmart amp. I simply want a very musical enclosure, even if it is very quiet. And I am fully aware that with that much cone area, I can get loud if I desire.

    I may end up settling for 4 15's in the end, though it may perform as well or better than my idea of 18's, it wont have that "OMFG" factor when looking at them.

    I am leaning towards 4 peavey lowriders, but the single 8ohm coils throw me off.......

    I must get to a .5ohm load if I want any decent power to drive them.

    Or, as my retarded brother in law tells me now, I should run 8 cheap 12's ported.

    My only wonder before planning was whether the placement of thew port would affect my sound any. I would prefer to run 1 large port as opposed to 2 smaller ones.



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals


  10. #10
    azimuth's Avatar
    azimuth is offline funded*by*soros



    Join Date
    Mar 2006
    Location
    Denver, Co
    Age
    39
    Posts
    9,053
    Post Thanks / Like
    Images
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    9 Post(s)

    Re: Port placement????

    Quote Originally Posted by kush-divinity View Post
    Ah, no I don't have the 18's, I am looking for some. No one around here has ran 18's since the mid-90's. Everyone is on the Memphis scene, running 1 or 2 PR12 off of a Walmart amp. I simply want a very musical enclosure, even if it is very quiet. And I am fully aware that with that much cone area, I can get loud if I desire.

    I may end up settling for 4 15's in the end, though it may perform as well or better than my idea of 18's, it wont have that "OMFG" factor when looking at them.

    I am leaning towards 4 peavey lowriders, but the single 8ohm coils throw me off.......

    I must get to a .5ohm load if I want any decent power to drive them.

    Or, as my retarded brother in law tells me now, I should run 8 cheap 12's ported.

    My only wonder before planning was whether the placement of thew port would affect my sound any. I would prefer to run 1 large port as opposed to 2 smaller ones.
    port placement would make a difference on a meter, but as a daily driver, not really. as long as firing direction stays the same, it won't matter much if it's passenger or driver side.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

  11. #11
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama

    Threadstarter


    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    Thank you for the answer. We have been debating this all day. I have decided to put the port at the top of the box. 6 inches high, 42 inches wide, and as deep as needed for a 30hz tune. I am going to make it step out at the bottom, and use the platform as an amp rack.



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals


  12. #12
    killabazz88's Avatar
    killabazz88 is offline sir SLAM-A-LOT



    Join Date
    Feb 2009
    Location
    louisville
    Posts
    5
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Icon10 Re: Port placement????

    use these MA 18's there cheap but will pound way harder than pyles and still give u a .5 ohm load 300-400 watts will make them sound good
    http://www.onlinecarstereo.com/CarAu...roductID=20088




  13. #13
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama

    Threadstarter


    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    Oh man, that's an ugly subwoofer. And a non-pressed paper cone? At $140 each I'll pass, but thanks. I can get SoundStream T1-15's local for 90 each..... cash paid and real customer service. I read that that site has awful CS.

    And I love your diss on Pyles. Cheap subs, but they have 1 good model.......



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals


  14. #14
    blackbonnie's Avatar
    blackbonnie is offline The Revolution



    Join Date
    Jan 2007
    Location
    Grand Rapids, MI
    Posts
    10,146
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    Quote Originally Posted by kush-divinity View Post
    Oh man, that's an ugly subwoofer. And a non-pressed paper cone? At $140 each I'll pass, but thanks. I can get SoundStream T1-15's local for 90 each..... cash paid and real customer service. I read that that site has awful CS.

    And I love your diss on Pyles. Cheap subs, but they have 1 good model
    .......
    really? care to elaborate....



    HU - Pioneer 800prs
    Mids - Peerless HDS nomex 6.5's
    Highs - Seas Prestige Alumi-domes
    Front Stage Amp - Sundown 100.4D
    Sub - SA-12
    Sub Amp - Saz-1000D
    Wire - Knukonceptz, Kicker Hyperflex

    Blackbonnie References/Feedback

  15. #15
    kush-divinity's Avatar
    kush-divinity is offline Klan of TN support Obama

    Threadstarter


    Join Date
    Sep 2008
    Location
    in line for DNA testing
    Posts
    530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Port placement????

    Yeah, the Red Label SQ-12.

    Maybe not the most awesome woofer ever....but it is a clone of the Kicker L7. A very **** close clone. Sounds exactly the same when swapping 1 for 1 in an in-car enclosure. A very tough woofer that can handle way over its 750rms rating forever. A man would almost be tricked into thinking these were actually made in Stillwater.........



    Lots of antique electronics.

    DEH-730
    Infinity Reference 6x8/Fultron tweet in all 4 doors
    Audiocontrol Epicenter
    US Amps HC-50(pink ftw)
    2 06L712 in 5.6 @ 27 for now
    NAPA 130amp alternator(142 actual)
    2ga Anchor Welding cable everywhere
    2 Group 29 Marine batteries - Brass Terminals


Closed Thread
Page 1 of 2 1 2 LastLast

User Tag List

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum