Closed Thread
Results 1 to 8 of 8

Reload Thread: 12DB-24DB Slope?

  1. #1
    Patthehat033's Avatar
    Patthehat033 is offline Senior VIP Member



    Join Date
    Nov 2011
    Location
    Missouri
    Posts
    425
    Post Thanks / Like
    Mentioned
    22 Post(s)

    12DB-24DB Slope?

    Hey,

    I have a RF T5002 and it has a 12db-24db slope on it. I have read some websites and I am still kind of confused how this works.

    It says it increases/decreases 12db or 24db (depending on which one I have it set on) per octave. But what frequency is it basing that off of?







  2. #2
    trumpet's Avatar
    trumpet is online now Supporting Vendor trumpet is a Supporting Member of the forum!

    trumpet is a Supporting Vendor of the forum!

    Join Date
    Jan 2011
    Location
    Langdon, ND
    Age
    33
    Posts
    3,892
    Post Thanks / Like
    Mentioned
    74 Post(s)

    Re: 12DB-24DB Slope?

    The crossover filters are to protect your speakers and to keep bass at the subwoofer and not have the subwoofer playing vocals. If you have a low pass crossover of 100 Hz on your subwoofer that means at 100 Hz the level is reduced 3 dB. With a slope of -12 dB, at one octave higher, or 200 Hz, the level is down another 12 dB for a total of -15 dB. You would almost never use a 100 Hz 12 dB/octave slope on a subwoofer because you can still hear a lot more than just bass with a slope that shallow.




    Small town service, family owned and operated. See our new mobile friendly web site at www.513electronics.com
    Home to CDT Audio's Systems Design Specialist
    Our CDT Audio dealer store, Clarion_JBL_Pioneer_PrecisionPower_DiamondAudio_Su ndown_Metra_T-Spec_AudioControl_Taramps and much more
    Closeout Sale - CDT Audio - FREE 5 Year Warranty Upgrade

  3. #3
    bubbagumper6's Avatar
    bubbagumper6 is offline CarAudio.com Veteran



    Join Date
    Apr 2006
    Location
    The D
    Posts
    10,712
    Post Thanks / Like
    Mentioned
    10 Post(s)

    Re: 12DB-24DB Slope?

    The difference between 12db/octave and 24db/octave is simply the slope at which the response curve falls off.

    In this image the crossover frequency is somewhere around 60Hz and the slope of the line to the left of it is what you're changing. The higher the number the faster it will fall. (Image borrowed from Basic Car Audio Electronics)

    (Also note the response pictured is a high pass filter, your low pass filter works the same way but it's mirrored horizontally)

    Last edited by bubbagumper6; 01-30-2012 at 01:48 PM.




  4. #4
    Patthehat033's Avatar
    Patthehat033 is offline Senior VIP Member

    Threadstarter


    Join Date
    Nov 2011
    Location
    Missouri
    Posts
    425
    Post Thanks / Like
    Mentioned
    22 Post(s)

    Re: 12DB-24DB Slope?

    Quote Originally Posted by trumpet View Post
    The crossover filters are to protect your speakers and to keep bass at the subwoofer and not have the subwoofer playing vocals. If you have a low pass crossover of 100 Hz on your subwoofer that means at 100 Hz the level is reduced 3 dB. With a slope of -12 dB, at one octave higher, or 200 Hz, the level is down another 12 dB for a total of -15 dB. You would almost never use a 100 Hz 12 dB/octave slope on a subwoofer because you can still hear a lot more than just bass with a slope that shallow.
    Okay that makes sense! But then if say we had the x-over at 100hz, would the db level increase as the hz got lower?




  5. #5
    Patthehat033's Avatar
    Patthehat033 is offline Senior VIP Member

    Threadstarter


    Join Date
    Nov 2011
    Location
    Missouri
    Posts
    425
    Post Thanks / Like
    Mentioned
    22 Post(s)

    Re: 12DB-24DB Slope?

    Quote Originally Posted by bubbagumper6 View Post
    The difference between 12db/octave and 24db/octave is simply the slope at which the response curve falls off.

    In this image the crossover frequency is somewhere around 60Hz and the slope of the line to the left of it is what you're changing. The higher the number the faster it will fall. (Image borrowed from Basic Car Audio Electronics)

    (Also note the response pictured is a high pass filter, your low pass filter works the same way but it's mirrored horizontally)

    This is a high pass crossover correct? Because you said the x-over frequency was 60hz, but the maximum power in the image is at like 1000hz.




  6. #6
    ahole-ic's Avatar
    ahole-ic is offline Banned



    Join Date
    Jan 2010
    Location
    Ivory Tower
    Posts
    2,936
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: 12DB-24DB Slope?

    Quote Originally Posted by Patthehat033 View Post
    This is a high pass crossover correct? Because you said the x-over frequency was 60hz, but the maximum power in the image is at like 1000hz.
    It is a high pass but maximum power is with the "enhanced Q crossover" at 100hz.




  7. #7
    bubbagumper6's Avatar
    bubbagumper6 is offline CarAudio.com Veteran



    Join Date
    Apr 2006
    Location
    The D
    Posts
    10,712
    Post Thanks / Like
    Mentioned
    10 Post(s)

    Re: 12DB-24DB Slope?

    Quote Originally Posted by Patthehat033 View Post
    This is a high pass crossover correct? Because you said the x-over frequency was 60hz, but the maximum power in the image is at like 1000hz.
    Yes...

    Quote Originally Posted by bubbagumper6 View Post
    (Also note the response pictured is a high pass filter, your low pass filter works the same way but it's mirrored horizontally)




  8. #8
    Patthehat033's Avatar
    Patthehat033 is offline Senior VIP Member

    Threadstarter


    Join Date
    Nov 2011
    Location
    Missouri
    Posts
    425
    Post Thanks / Like
    Mentioned
    22 Post(s)

    Re: 12DB-24DB Slope?

    Quote Originally Posted by www.eCrack.net View Post
    It is a high pass but maximum power is with the "enhanced Q crossover" at 100hz.
    Thanks for pointing that out to me. What type of crossover is on most modern amplifiers? Or is there no way to really tell?




Closed Thread

Similar Threads

  1. Rainbow 12db slope question
    By ENDER_XVICM in forum General Discussion
    Replies: 2
    Last Post: 09-25-2007, 01:32 PM
  2. 24db slope @ hu or amp?
    By 60ndown in forum General Discussion
    Replies: 0
    Last Post: 08-27-2006, 03:15 PM
  3. are 24db slopes better for my components?
    By noob with an RS in forum General Discussion
    Replies: 16
    Last Post: 06-20-2005, 03:56 PM
  4. 12dB/Octave vs 24dB/Octave
    By iwantmorebass in forum Amplifiers
    Replies: 2
    Last Post: 01-03-2003, 07:59 PM

Posting Permissions

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

1e2 Forum