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"This Harbeth User Group (HUG) is the Manufacturer's own managed forum dedicated to natural sound from microphone to ear, achievable by recognising and controlling the numerous confounding variables that exist along the audio chain. The Harbeth designer's objective is to make loudspeakers that contribute little of themselves to the music passing through them.

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Feb. 2018
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Adjust the bass output of the port

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  • Adjust the bass output of the port

    Hi Harbeth Friends!

    Live in Norway and I am quite new in here. Have just bought a new pair 30.1 in jet-black paint. I thought the painted version played a bit more right to my ears, not much but enough to select this version.

    My room is not very friendly in the 50Hz region. I have a relatively heavy notch (-5/7db)in this area. Therefore, my question is this. Is it possible to tune the port a bit away from this area? Example by putting a longer tube in the existing port? Like what KEF do with the REF series.

    Don't misunderstand me! I am very happy with the Harbeth sound.

  • #2
    I would suggest using REW or similar software to measure actual response, then let it create a correction curve, and upload that into a device that does this like the Equalizer Apo if you are using a PC as a source, or a MINI DSP if not.

    I did this with the Harbeth P3ESR speakers that I use as desktop speakers in my study, and that suffered a bit of a boom because of the proximity to the desk. Since in my study I use my computer as a streaming source, I could use the free Equalizer Apo. The only expense was that of a measurement microphone (I woud recommend the Umik-1 calibrated usb microphone).

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    • #3
      The port and cabinet and woofer are in a carefully considered sympathetic relationship, and a great deal of time was invested in balancing these variables.

      First point: is the speaker grille fitted to both speakers when playing music?
      Alan A. Shaw
      Designer, owner
      Harbeth Audio UK

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      • #4
        Originally posted by A.S. View Post
        The port and cabinet and woofer are in a carefully considered sympathetic relationship, and a great deal of time was invested in balancing these variables.

        First point: is the speaker grille fitted to both speakers when playing music?
        No, the grille is off. It was not easy to remove the grill without scratch anything. I made it. Used a custom L key

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        • #5

          No, the grille is off. It was not easy to remove the grill without scratch the corners or anything else. I made it. Used a custom L key.

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          • #6
            I'm not sure why you removed the grille when the speakers are designed to be used with the grille in place. In fact, at no time during any of the months-long technical design and listening adjustment phase are the grilles ever removed. Not once: fitted they are an integral part of the design.

            I strongly suggest that you replace the grilles, and the intended LF/MF balance will be restored to my design parameters. That may not entirely solve your room issues, but it is at least a sensible starting point.

            Can you imagine how the presence or absence of a grille (any cloth grille, any make of speaker) would potentially have a significant influence of the bass output? Trying to blow through the grille cloth might be illuminating.
            Alan A. Shaw
            Designer, owner
            Harbeth Audio UK

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            • #7
              Okay Mr! :-) NP. They are on again. I have always removed the grille on all speakers I owned. Some speakers I owned do not even have any grille.

              One grille is very hard to put in and the other is just too loose. I have adjusted the grille frame so they are 99% in angle and straight. Took some time. Have also swapped them. Looks like speakers are not 100% equal in the the grille slott.. Anyway, they play well and look Nice in jet black!

              I use Devialet D400. What about SAM level? Any suggestion’s?

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