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Filter to stop tweeter?

Discussion in 'Amps [BG]' started by Veldar, Mar 3, 2014.

  1. Hey guys, I have a TC 4x10 with a tweeter and it's making my sound super harsh, I'm using a Crown power amp as a head and it has low and high pass filters, what frequency would I start the filter at to make it sound smother?
     
  2. I can't turn the tweeter off on my cab, and I haven't had a non tweeter cab in about a year but I'll mess around with it when I get home.
     
  3. Use the low pass filter for this. Start with it wide open and lower it's cutoff until you're happy.
     
  4. bobcruz

    bobcruz

    Mar 10, 2004
    Alameda, CA
    +1 on experimenting until you're happy. Does the amp have a fixed slope for the low pass or can you vary it? If it's a fixed steep slope, like 18 or 24 dB per octave, that would suggest using a higher cutoff, but if you can have a shallow slope like six dB per octave, you could cutoff from a lot lower frequency.
     
  5. frankenp

    frankenp

    Jul 17, 2008
    Halifax, NS
  6. DukeLeJeune

    DukeLeJeune rational romantic mystic cynical idealist Gold Supporting Member

    Nov 24, 2008
    Preston, Idaho
    Disclosures:
    Owner & designer, AudioKinesis; Auth. mfg, Big E (Home Audio only)
    3 kHz is probably a reasonable starting point, and adjust as needed from there.
     
  7. Jazz Ad

    Jazz Ad Mi la ré sol Gold Supporting Member

    Just unplug it.
     
  8. DukeLeJeune

    DukeLeJeune rational romantic mystic cynical idealist Gold Supporting Member

    Nov 24, 2008
    Preston, Idaho
    Disclosures:
    Owner & designer, AudioKinesis; Auth. mfg, Big E (Home Audio only)
    If the tweeter's highpass filter is anything steeper than first order (which would be just a series capacitor), disconnecting the wires from the tweeter would probably result in a virtual short at the resonance frequency of the circuit. At high power levels, that could be a problem for the amp.

    If you break the connection in between the highpass filter and the amplifier, you should be fine.
     
  9. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps
    Duke always has great advice, but I might start the LPF at 5k rather than 3. Some folks like 3k, but I find it a bit too dark.
     
  10. bobcruz

    bobcruz

    Mar 10, 2004
    Alameda, CA
    OP, if the power amp is your Crown XLS, the highest low pass frequency you can select is 3 KHz, and the filter is a steep 24 dB per octave. Let us know how it sounds when you try it.
     
  11. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps
    Oh snap, that's a bummer. Never mind my post, then.
     
  12. DukeLeJeune

    DukeLeJeune rational romantic mystic cynical idealist Gold Supporting Member

    Nov 24, 2008
    Preston, Idaho
    Disclosures:
    Owner & designer, AudioKinesis; Auth. mfg, Big E (Home Audio only)
    Dangit, 24 dB per octave is mighty steep. Well, probably worth trying anyway.
     
  13. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    Can you cover the tweeter with some padding to see if it will filter out some of the harshness? Not a solution but it might allow you see how a modification would affect the sound. A physical way to give you something to aim for electronically.
     
  14. Caca de Kick

    Caca de Kick Supporting Member

    Nov 18, 2002
    Seattle / Tacoma
    The tweeter in my 810 drove me nuts, so I simply unplugged it.
     
  15. DukeLeJeune

    DukeLeJeune rational romantic mystic cynical idealist Gold Supporting Member

    Nov 24, 2008
    Preston, Idaho
    Disclosures:
    Owner & designer, AudioKinesis; Auth. mfg, Big E (Home Audio only)
    Great idea! Tape should suffice.
     
  16. Well, the low-pass was way to dark for my liking by I do have a Pod that I can use to eq out the frequency's after my preamp so I'll have ago with that, I'll report back if It sounds good or bad and if worse comes to worse......IT'S TAPE TIME!

    EDIT: Pod didn't work either, would a cheap graphic be worth looking into?
     
  17. okcrum

    okcrum in your chest Supporting Member

    Oct 5, 2009
    Verde Valley, AZ
    Disclosures:
    Endorsing Artist: Dark Horse strings
    Probably a better tweeter would be cheaper.
     
  18. I taped over it, sounds heaps better, now I just need to replace my MECs.
     
  19. bobcruz

    bobcruz

    Mar 10, 2004
    Alameda, CA
    I've done the tape thing with a harsh piezo tweeter, but rather than tape I used black neoprene mouse pad cut to fit over the tweeter and held on with the tweeter mounting screws. Worked great and was invisible through the metal grill.
     
  20. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    If you want to get fancy, tweeter covers. You should be able to line them to tune how much filtering you want.


    [​IMG]
     



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