Stock 03 VW speakers. Cap values to stop bass?

Discussion in 'OT Technology' started by dr.zed, May 19, 2008.

  1. dr.zed

    dr.zed DR.ZED OT Supporter

    Joined:
    Nov 20, 2005
    Messages:
    771
    Likes Received:
    0
    Vehicle is a 2003 VW with a Premium stereo.

    I have a 10" sub that I used a line level converter for the bass. I want to lock off most bass frequency to the front and rear speakers to prevent clipping, as I now have my bass turned up to get the sub to run.

    Can you suggest a value of capacitor that I can use inline to the speakers (I'll put them at the back of the deck) that will reduce a lot of bass that would normally clip out the speakers?

    Thanks in advance.
     
  2. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    A 400mF non-polarized capacitor will give you a 6dB/octave high-pass at ~100Hz.
     
  3. Doc Brown

    Doc Brown Don't make me make you my hobby

    Joined:
    Mar 31, 2006
    Messages:
    16,404
    Likes Received:
    0
    Location:
    Ohio
    It depends on the speakers ohm rating.

    8 ohms = 200uf

    6 ohms = 265uf

    4 ohms= 400uf
     
  4. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    car audio is 4ohms, doc. Sometimes oems will use funky speaker setups that would change things at the individual driver. They may use two 8ohms wired in parallel, for example. Regardless, each channel should show a 4ohm load to the head unit. he says he will cap them at the back of the hu... so that's just traditional 4x output with ~4ohm load.
     
  5. Doc Brown

    Doc Brown Don't make me make you my hobby

    Joined:
    Mar 31, 2006
    Messages:
    16,404
    Likes Received:
    0
    Location:
    Ohio
    Well it's worth mentioning, because if for whatever reason he had 8 ohm speakers, the 400uf caps would give him a crossover point of 50hz.
     
  6. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    which would still do a good job at kicking out the low-end.

    Caps are cheap, and I would think it reasonable to buy a few diff ones and experiment, anyway.

    or better yet, get a head unit that doesn't suck bfdd and has a crossover :o
     
  7. GammaRadiation

    GammaRadiation Active Member

    Joined:
    Feb 15, 2007
    Messages:
    29,840
    Likes Received:
    0
    Location:
    Random Location.FL
    This is False

    Ford, for instance, has 6ohm speakers. 6ohm load at the head unit per channel. In the OEM Bose system I removed out of a towncar there were 12ohm speakers driven by OEM amps.
     
  8. BoomBoomBoy

    BoomBoomBoy Guest

    All the Infinity car speakers are 2 ohms.
     
  9. twistid

    twistid Banged By Super Models Moderator

    Joined:
    Jul 15, 2001
    Messages:
    40,786
    Likes Received:
    100
    Location:
    The Kansass/Oklahomo Border
    from the factory i've seen 1ohm, 2ohm, 3ohm, 4ohm, 6ohm, and 10ohm speakers in cars.
     
  10. MaximaDrvr

    MaximaDrvr Member

    Joined:
    Sep 29, 2006
    Messages:
    582
    Likes Received:
    0
    Location:
    Raleigh, NC
    Fronts are 4ohm woofer and 4ohm tweeter
    Rears are 2ohm woofer and 4ohm tweeter
     
  11. Doc Brown

    Doc Brown Don't make me make you my hobby

    Joined:
    Mar 31, 2006
    Messages:
    16,404
    Likes Received:
    0
    Location:
    Ohio
    2ohm = 800uf

    1ohm = 1.6 farad
    :eek3:

    Probably a good idea to use an electronic crossover at that point.
     
  12. GammaRadiation

    GammaRadiation Active Member

    Joined:
    Feb 15, 2007
    Messages:
    29,840
    Likes Received:
    0
    Location:
    Random Location.FL
    Depends on the final load at the signal source.
     
  13. dr.zed

    dr.zed DR.ZED OT Supporter

    Joined:
    Nov 20, 2005
    Messages:
    771
    Likes Received:
    0
    LOL... Big Fucking Donkey Dick. That made my night.

    Don't you know that the VW interior is the pinnacle of success and that destroying that with an aftermarket HU would be blasphmey?

    :)
     
  14. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    wtf, are you deusexaethera's AE?

     
  15. dr.zed

    dr.zed DR.ZED OT Supporter

    Joined:
    Nov 20, 2005
    Messages:
    771
    Likes Received:
    0
    So the agreement is around 400 uf for the front? What about the 2 ohm rears? 600 uf?

    I'm guessing a non polarized cap means it can be installed either way, but does it matter on which speaker lead? + or -?
     
  16. dr.zed

    dr.zed DR.ZED OT Supporter

    Joined:
    Nov 20, 2005
    Messages:
    771
    Likes Received:
    0
    Well... that proves my experiement!

    His intellect and charm carries over ALL OVER OT!

    (shall I try that line in Freaky Shiat?)
     
  17. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon


    speakers are AC. Technically polarity is defined simply so that all speakers are wired in-phase with each other.

    you can install on either lead, just be consistent. I use the (-) lead, out of habbit.
     
  18. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    what intellect? He's a fucking moron.
     
  19. dr.zed

    dr.zed DR.ZED OT Supporter

    Joined:
    Nov 20, 2005
    Messages:
    771
    Likes Received:
    0
  20. dr.zed

    dr.zed DR.ZED OT Supporter

    Joined:
    Nov 20, 2005
    Messages:
    771
    Likes Received:
    0
    No kidding.

    I remember (and I hope he gets in here to defend himself so I can laugh more) how he says all small blocks are the same when somebody pointed out a picture of an LT5.

    That was a fun one...
     
  21. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
  22. JRock10

    JRock10 Active Member

    Joined:
    May 25, 2005
    Messages:
    7,751
    Likes Received:
    0
    Location:
    Nashville, TN FTW
    :rofl:
     
  23. Doc Brown

    Doc Brown Don't make me make you my hobby

    Joined:
    Mar 31, 2006
    Messages:
    16,404
    Likes Received:
    0
    Location:
    Ohio
    Que?
     
  24. GammaRadiation

    GammaRadiation Active Member

    Joined:
    Feb 15, 2007
    Messages:
    29,840
    Likes Received:
    0
    Location:
    Random Location.FL
    I wouldnt place a cap on each individual speaker. I'd pull the radio out, cut the harness, measure the final load at the headunit and put the caps there. If the final load is 3ohms at the head unit I'd place a cap that would get me in the 50-75Hz range right at the source.
     
  25. Doc Brown

    Doc Brown Don't make me make you my hobby

    Joined:
    Mar 31, 2006
    Messages:
    16,404
    Likes Received:
    0
    Location:
    Ohio
    Oh alright, I see what you meant. But why at the head unit?
    If you're going to use caps for a high pass, it's just as easy to have them near the woofer.
    What I was getting at though, was that huge and expensive caps on a woofer aren't the best solution anyway.
    On a typical car stereo woofer, there are probably ranges of 8ohms or more from spec to high point. So the actual crossover point is really going to be all over the place.
    Even a cheap electronic crossover would give better results than that.
     

Share This Page