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Using Parametric EQ as a Poor Man's HPF?

Discussion in 'Amps and Cabs [BG]' started by alanolynn, Dec 11, 2019.


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  1. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
    Need some advice...

    My BX1500 is a wonderful new addition, and I have the idea in my head. If I use the "low mid" control, when set to 50hz, and roll it completely off, could that possibly do the trick as an "on-board HPF"? Or am I still better off finding a Broughton and just leaving it at that?

    Thanks for the help in advance!
     
  2. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    Nope, it won't work the same way at all, and is likely to sound pretty terrible in most cases IME.
     
  3. GrapeBass

    GrapeBass

    Jun 10, 2004
    Toronto
    Graphic designer: Yorkville Sound
  4. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
    I suppose I'll claim ignorance on that one then. Can you think of any other tricks? I know this head has a heck-of-a-lot of EQ control. I just don't want to pick up another piece of gear if I don't need to.

    I really like the concept of the HPF, in theory, being that it runs a Henry 8x8. It'd be nice to clean up the sound AND help protect those little drivers.

    Thanks
     
  5. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Wrong tool for the job
     
  6. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
  7. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Nope
     
  8. chaosMK

    chaosMK

    May 26, 2005
    Albuquerque, NM
    Too much hip thrust
    I roll down the Bass knob on my bass.
     
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  9. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    I owned and occasionally gigged a BX500 for a while. The EQ sections are feature rich, but it's still a nope.
     
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  10. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
    A wealth of knowledge, but not a man of many words. :laugh:
     
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  11. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
    I appreciate the input. Thank you.

    No worries. Figured it was worth a shot. Thanks again.
     
  12. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    I posted some graphs in the HPF/LPF megathread showing why the usual bass control, graphic EQ, or parametric EQ kludges don't really cut it. But that's not to say that everyone needs a dedicated HPF, IME and IMO it just depends.

    Bass control cut vs 4th order HPF:

    BassCut_vs_HPF.jpg

    Graphic EQ cut at 32Hz vs 4th order HPF set at 32Hz (-3dB point):

    10Bandgraphic_32Hzcut.JPG

    HPF_32Hzminus3dB.JPG
     
  13. PraiseBassing

    PraiseBassing Supporting Member

    Mar 6, 2017
    California
    With the BX1500, you are better off trying to use the built in crossover. Set it at 100, it’s lowest setting and use the HI output. If you find it taking too much low end, don’t be afraid to boost the bass knob to see if you find something you like. While a HPF set at 100 can be off-putting on it’s own, adding some bass boost can give you a fat tone with the garbage way down low in control. This is of course you are good with only using one of the built in amps.
     
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  14. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
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  15. alanolynn

    alanolynn

    Aug 19, 2012
    NNY
    That's an interesting angle. I'm at 4 ohms as it sits, so for my purposes, the single ample/channel is definitely good. Worth a try!
     
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  16. PraiseBassing

    PraiseBassing Supporting Member

    Mar 6, 2017
    California
    That crossover uses a HPF for the HI side. I do not know the slope tho, it may be too steep, but it won’t hurt to try it out and see how you like it.
     
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  17. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    No problem. Smart people tend to say "I don't know" fairly often and that makes at least some of us a lot more motivated to help them learn. Yel_wink.gif
     
  18. micguy

    micguy

    May 17, 2011
    A band dip filter at 50 Hz will get rind of some usable bass frequencies. It won't, however filter out subsonic stuff - the stuff you really want/need a high pass filter to get rid of.

    The amp you have, assuming it's reasonably well designed (almost all bass amps are in this regard), will have a high pass filter that does remove subsonic stuff.
     
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  19. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    IIRC it's 2nd order, but I only have the BX1200 schematic on hand and welcome correction, as always. It also comes pretty late in the signal chain, so it'll do more for the speaker than the preamp headroom, for better or worse.
     
    Last edited: Dec 11, 2019
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  20. PraiseBassing

    PraiseBassing Supporting Member

    Mar 6, 2017
    California
    Interesting. A little surprised it’s 2nd order based on the designed usage, but not surprised it’s late in the chain. Only way to know how it’ll sound is to try though. Won’t hurt anything.

    @alanolynn just go easy on the bass boost when testing. While 12db per octave at 100hz means 30hz will be attenuated a bit, it’s best to take it slow and listen to the tone, but also to how the speakers are handling it.
     

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