Closed Thread
Results 1 to 9 of 9

Reload Thread: to all of you trying to increase db,check this

  1. #1
    luv2bass's Avatar
    luv2bass is offline Senior VIP Member



    Join Date
    Jan 2004
    Location
    LA
    Age
    35
    Posts
    166
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    to all of you trying to increase db,check this

    have you tried to add polyfill?

    polyfill works by "adding" volume to a box.if you don't change your port dimensions the resonant freq drops.but what happens if you make your port shorter and tune to the same freq you were tuned to before adding polyfill?

    answer:your db number will increase by at least 1db.

    i have done it and it works.

    if you are afraid to cut your port to see the results make a simulation first with winisdpro.

    take one box at 100 liters tuned at 45hz.it should have a port with a diameter of 16cm and length 18cm.

    now if you had add polyfill it would be at least an increase of 30%.that should be 130liters.but with the same port dimensions the tuning drops.the spl drops too.

    if you change tuning freq again to 45hz by making the vent shorter you should see the spl go higher by almost over 1db.

    check it and tell me your results.good luck.







  2. #2
    augie's Avatar
    augie is offline Member



    Join Date
    Oct 2003
    Location
    las vegas. nevada
    Age
    30
    Posts
    68
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    i tried it on win isd and it went up by .8 dbs




  3. #3
    mgaidica's Avatar
    mgaidica is offline CarAudio.com Veteran



    Join Date
    Jan 2003
    Location
    Northville, MI
    Posts
    3,065
    Post Thanks / Like
    Images
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    winISD isnt going to tell u your actual DB score..?On a good meter, I have doubts about your theory..



    2x JBL 1200.1 for sale...

    AIM- Mgaidica

  4. #4
    bigbassman's Avatar
    bigbassman is offline Master of all things loud bigbassman is a Supporting Member of the forum!



    Join Date
    Apr 2002
    Location
    Southern WV
    Age
    33
    Posts
    2,890
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    doesn't work

    ISD is 100% worthless for anything but a port length reccomendation

    Loyd L.



    SQL Prolly

  5. #5
    ngsm13's Avatar
    ngsm13 is offline BSEE



    Join Date
    Sep 2002
    Location
    Cincinnati, OH
    Posts
    35,730
    Post Thanks / Like
    Images
    20
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    65 Post(s)

    Re: to all of you trying to increase db,check this

    Quote Originally Posted by bigbassman
    doesn't work

    ISD is 100% worthless for anything but a port length reccomendation

    Loyd L.
    100% true...plus...real world SPL take knowledge and trial and error. I think loyd could also tell you that. peace

    NG




    http://crunktimes.com/ct/
    nG - BSEE

  6. #6
    bumpin_blazer's Avatar
    bumpin_blazer is offline Only the Strong Survive



    Join Date
    Mar 2002
    Location
    Austin,TX
    Age
    32
    Posts
    8,044
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    yeah i think loyd and nick morgan have put a few SPL theories to rest. i know last time i talked to nick he said that "theory's are great but myself, loyd and eric have put a few of those to rest as anything more than thought."

    adam



    2006 Bright Island Blue 6s: stock 6 disc in dash, Hertz Hi-Energy 6.5" comps, MB Quart Ref 12", eclipse 5-channel sub amp.

    Car mods: Lowered on Mazdaspeed springs with Koni Yellow shocks, Racing beat front/rear sway bars with AWR end links, LED turn signals, tail lights, front side markers, 18" ADR Cypher rims, 55w HID's in low beam and fogs, 5% tint all the way around. No go fast mods yet...tuning and Mazda6 don't go well together .

    Steve a.k.a. ss3079: So this one lady goes, "These ignorant people who drive around blasting there music, they cant hear emergency vehicles"
    So that set me off, and I said "Well then why do they let deaf people drive?"

    AOL: JmKeenen

  7. #7
    B&R Innovation2's Avatar
    B&R Innovation2 is offline www.soundhertz.com



    Join Date
    Mar 2003
    Location
    Westchester NY
    Posts
    1,019
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    Dont feel bad though...were all proud of you for playing with winISD



    I used to spend a lot of my free time here. It was fun I suppose. Still rocking the 9515 and Better Audio amp haha.

    How's incriminator stuff these days?

  8. #8
    luv2bass's Avatar
    luv2bass is offline Senior VIP Member

    Threadstarter


    Join Date
    Jan 2004
    Location
    LA
    Age
    35
    Posts
    166
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    i don't insist on using winisd but it really works cause i DID MEASURE the sub after polyfill.

    you must see the graphs.

    do you know how can i post them?




  9. #9
    BDIDDY's Avatar
    BDIDDY is offline Sittin' Slick



    Join Date
    Mar 2003
    Location
    Tennessee
    Age
    27
    Posts
    2,575
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: to all of you trying to increase db,check this

    If bassman says it's not gonna work......it probably won't work.



    "Just have to remember to take everything in stride, and don't put off till tomorrow what you can do today because there might not be a tomorrow. " <---- RAMOS


    Profliepower is the funniest guy ever...

Closed Thread

Similar Threads

  1. how should i increase spl?
    By crakerhead in forum General Discussion
    Replies: 2
    Last Post: 01-09-2004, 02:07 PM
  2. Second Skin price increase clarification
    By ifandorbuts in forum General Discussion
    Replies: 9
    Last Post: 09-21-2003, 03:07 PM
  3. Will Polyfill increase or decrease effiency
    By adammk5 in forum General Discussion
    Replies: 4
    Last Post: 08-15-2003, 01:47 PM
  4. how to increase voltage
    By marleyskater420 in forum Amplifiers
    Replies: 17
    Last Post: 08-05-2003, 02:29 AM

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