Results 1 to 4 of 4
  1. #1
    meteo man
    Join Date
    Feb 2005
    Location
    Fort Wayne, IN
    Posts
    35

    80 HZ high pass crossover frequency

    Sorry to ask another basic question, but when a subwoofer is said to have an 80HZ high pass crossover frequency with a 6dB/ocatve slope, does that mean there is absolutely no 80 HZ info sent to the main speakers and a gradual increase of 6dB/octave at frequencies above 80 HZ or is there full 80HZ info sent to the main speakers and a gradual decrease of info at a rate of 6dB/octave slope below 80HZ? I hope my question isn't confusing.
    meteo man

    Adcom GFA-5400 amp
    Adcom GTP-602 tuner/preamp
    Toshiba SD2700 DVD player
    Rotel RCD-1070 CD player
    Paradigm Signature S2 speakers
    Velodyne SPL-800R subwoofer
    Adcom ACE-615 AC line conditioner
    Straightwire Stage speaker wires
    Straightwire Chorus cable interconnects

  2. #2
    Loving This kexodusc's Avatar
    Join Date
    Nov 2003
    Location
    Department of Heuristics and Research on Material Applications
    Posts
    9,025
    Quote Originally Posted by edlchiang62
    Sorry to ask another basic question, but when a subwoofer is said to have an 80HZ high pass crossover frequency with a 6dB/ocatve slope, does that mean there is absolutely no 80 HZ info sent to the main speakers and a gradual increase of 6dB/octave at frequencies above 80 HZ or is there full 80HZ info sent to the main speakers and a gradual decrease of info at a rate of 6dB/octave slope below 80HZ? I hope my question isn't confusing.
    The filter in the subwoofer doesn't completely cut off the 80Hz signal...But I don't generally see it described as you've written. A 6dB/octave slope, high pass at 80Hz would imply that the signal is up 6 dB at 160Hz. Can't imagine a sub being made that only has a 6 dB/octave low pass filter.

  3. #3
    Digs tunes and vids RJW1138's Avatar
    Join Date
    Sep 2004
    Location
    Regina, SK
    Posts
    46
    Quote Originally Posted by edlchiang62
    Sorry to ask another basic question, but when a subwoofer is said to have an 80HZ high pass crossover frequency with a 6dB/ocatve slope, does that mean there is absolutely no 80 HZ info sent to the main speakers and a gradual increase of 6dB/octave at frequencies above 80 HZ or is there full 80HZ info sent to the main speakers and a gradual decrease of info at a rate of 6dB/octave slope below 80HZ? I hope my question isn't confusing.
    First of all, I just want to make sure that you're indeed talking about the high pass filter, and not the low pass filter. The high pass filter is what you'd use if you were sending your main speaker signals to your sub, having it do high-pass filtering on this signal, and then passing the resultant signal on to your speakers. Is this what you're referring to?

    Anyways, your 2nd guess is the correct one. Well, almost. The crossover point is not actually at 0db, but is rather the -3dB point. This is the standard way for measuring crossover points. So then, everything above 80-something Hz is passed through, 80Hz itself is -3dB below this, and the slope reduces everything below this by 6dB per octave (40Hz = -9dB, 20Hz = -15dB). Hope this is what you wanted to know.

  4. #4
    meteo man
    Join Date
    Feb 2005
    Location
    Fort Wayne, IN
    Posts
    35
    Thanks for the info..I was about the high pass filter.
    meteo man

    Adcom GFA-5400 amp
    Adcom GTP-602 tuner/preamp
    Toshiba SD2700 DVD player
    Rotel RCD-1070 CD player
    Paradigm Signature S2 speakers
    Velodyne SPL-800R subwoofer
    Adcom ACE-615 AC line conditioner
    Straightwire Stage speaker wires
    Straightwire Chorus cable interconnects

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

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