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Thread: 69-70 Hz problem: advice requested

  1. #1
    Join Date
    Jan 2017

    69-70 Hz problem: advice requested

    In my listening room I have a problem with bass at 69-70 Hz: bass is very boomy at this frequency. Is there a way to somehow mitigate this problem without affecting other frequencies which I'm quite happy with? Any advice and/or recommendations are much appreciated.
    Transport: Ultra High-End PC;
    DAC: Ayre DX-5DSD (modded);
    Preamp: ARC Reference Anniversary (modded beyond recognition);
    Power amps: Ayre MX-R Twenty (modded);
    Speakers: Monitor Audio PL300 (mercilessly modded);
    Subwoofers: a pair of REL Stentor III (radically modded);
    Cables: Audioquest Dragon & Hurricane, Wild Blue Yonder, Wild Wood.
    Power: dedicated line+a pair of AQ Niagara 5000AP.

  2. #2
    [WBF Founding Member]
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    [Technical Expert] Bruce B's Avatar
    Join Date
    Apr 2010
    Seattle, WA
    the 60-80Hz range is problematic in every room.
    Some of the things to help:

    Bass traps - never can have too many!
    Speaker/Listening positioning.
    Subs with DSP - adding more bass seems counter intuitive, but, if you can get an out of phase signal at the problem frequencies, it helps.
    Last edited by Bruce B; 02-23-2017 at 01:40 PM.
    Bruce A. Brown
    Puget Sound Studios
    Stereomojo reviewer
    Seattle, WA

    Even a blind squirrel gets a nut once in a while!

  3. #3
    Member Sponsor [WBF Founding Member] Mike Lavigne's Avatar
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    Apr 2010
    one thing to try that is cheap and can work is to experiment with speaker and subwoofer height. the floor-bass driver relationship can affect the mid bass quite a bit.

    it might not matter, but it might help.

    you can get some sort of platform, or longer spikes, or even a few blocks of hardwood. in any case it's small effort to investigate. 2 inches can make a big difference in bass hookup in certain frequencies. the floor has a much larger effect on bass than other surfaces. do experiment with varying heights as small changes in floor-driver distance can make big differences.

    in my old room when I had Watt Puppy 5.1's back in 1998 I was able to smooth out my bass in this way. the room was small and I already had tube traps. so my options were limited.

    keep in mind raising the main speakers raises your tweeters and mids, so you might need to slant them to keep your listening height the same.
    Last edited by Mike Lavigne; 02-23-2017 at 01:35 PM.
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  4. #4
    nope. used to have the same problem. do not blindly waste your time and energy on accessories before finding out the exact boundary that is interacting with your loudspeakers to create this 70 Hz peak. do the (sub) woofer crawl first by placing one of your speakers in your listening position. play a 70 Hz tone and walk along the perimeter of your room to see the what it is that is resonating. you will realize it is shamefully obvious what the exact problem is.

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  6. #6
    VIP/Donor [VIP/Donor] andromedaaudio's Avatar
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    Jan 2011
    Amsterdam holland
    First i would look at is the speakercabinet .
    Is it a boomy design meaning is the bassdriver setting the whole housing in motion ?

  7. #7
    VIP/Donor [VIP/Donor] andromedaaudio's Avatar
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    Jan 2011
    Amsterdam holland
    Monitor Audio PL300 (mercilessly modded);

    ??? what are the mods ??

  8. #8
    Addicted to Best! Rodney Gold's Avatar
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    Jan 2014
    Cape Town South Africa
    You have a PC as a transport.. not using analog sources as per your sig

    If your player has a dsp parametric eq section , use it
    Programs like J river and roon have them
    Program in a dip of -6db , centred around 69hz, vary the Q from 3 to 5 in the parametric eq section

    You could also use full time and freq room correction like DIRAC or Acourate and set them only to work below 250hz or so .. so you dont mess with upper freqs and only work in the bass
    You should easily tame that beastly bass and more if you want
    Roon/Tidal ..Squeezebox touch . Trinnov ST2 room correction...Twin Devialet D Premier amps , Vivid Audio Giya G1 Spirits .. fully treated room

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  10. #10
    Addicted to Best! sbo6's Avatar
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    May 2014
    Round Rock, TX
    Rel Stentors are great subs, I had one not too long ago. With two of them and careful placement (including potentially lifting off the ground) you should be able to "control" that bass node at the listening seat. Also, more bass traps in corners is not always the best approach, many room have "dead' corners relative to the listening spot and adding traps just deadens the life out of the room and does nothing to manage bass. Room EQ Wizard is your friend. Measure and move, measure and move, then do final listening / placement tweaking for the last 2%.
    3x20A circuits | PS Audio PPP | Music PC (DEQ, HQPlayer, Roon) | HDPLex LPSU -> UltraCap LPS-1 -> Sonore Ultrarendu D->D | Aqua Acoustic Quality Formula DAC | Purity Audio Silver Statement preamp | Wells Audio Innamorata amp (mid/tweet) | Musical Fidelity A3CR amp (woofers)| Usher BE20D speakers with GR Research upgrade | 2: JL Audio F113 subs | JPS Labs SC3 ICs + Aluminata/SC2 SCs | Stillpoints, BD cones | Custom birch rack | Fully treated + dedicated 2 channel room)

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