HUG - here for all audio enthusiasts


"This Harbeth User Group (HUG) is the Manufacturer's own managed forum dedicated to natural sound, realisable by controlling the confounding variables between tthe microphone and the listeners' ears.

For example, the design of and interaction between the hifi amplifier and its speaker load can and potentially will alter the sound balance of what you hear. To reproduce the sounds captured by the recording microphones, as Harbeth speakers are designed to do, you would naturally select system components (sources, electronics, cables and so on) that do not color the sound before it reaches the speakers.

Identifying components for their system neutrality should, logically, start with the interpretation and analysis of their technical, objective performance, as any and every deviation from a measurably flat frequency response at any point along the serial chain from microphone to ear is very likely to cause the total system to have an audible sonic personality. That includes the contribution of the listening room itself.

HUG specialises in making complex technical matters simple to understand, aiding the identification of audio components likely to maintain a faithful relationship between the recorded sound and the sound you hear. With our heritage of natural sound, HUG cannot be really be expected to guide in the selection, approval, endorsement or even discussion of equipment that is intend to introduce a significantly personalised sound to the audio signal chain. For that you should do your own research and above all, make the effort to visit an Authorised Dealer and listen to your music at your loudness on your loudspeakers through the various electronics offered there. There is no on-line substitute for that time investment in a dealer's showroom.

If you desire to intentionally tune your system sound to your personal taste, please consider carefully how much you should rely upon the subjective opinions of strangers. Their hearing acuity and taste will be different to yours, as will be their motives and budget, their listening distance, listening loudness and listening room treatment, not necessarily leading to appropriate equipment selection and listening satisfaction for you.

Alternatively, if faithfully reproducing the sound intended by the composer, score, conductor and musicians over your speakers is your audio dream, then understanding something of the issues likely to fulfill that objective is what this forum has been helping with since 2006. Welcome!"

Jan. 2018
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mid bass driver repair

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  • mid bass driver repair

    A little while back I had a problem w/a mid bass driver on my Compact 7's. I realized it as soon as it happened although thereafter it was difficult to detect because it seemed to reveal itself at only a certain frequency or frequencies. In any event, I brought it to my dealer and the unit appears to have been repaired, not replaced. I was told it was replaced, but perhaps I misunderstood. I will clarify that, but there are quite a few fingerprints all over it which could conceivably have happened during the installation, but what leads me to believe it was repaired is that the circumference of the cone where it attaches to the driver is not smooth and even like the radial driver in the other speaker and appears to have been glued.

    Is this a proper result? Are the fingerprints something to be concerned about and can they be removed? I don't seem to detect any audible problems, but perhaps I'm missing it. Visually it doesn't look right, but its the sound that matters and I'm left wondering if this was correctly done and if performance is degraded.

    I'm going to address this with the dealer, but before I do I'd like some additional information.

    Much appreciated.

  • #2
    Repairs to drivers?

    Originally posted by str8fast View Post
    ... there are quite a few fingerprints all over it ...
    This is not really an issue for the harbeth User Group as you are already engaged in a dialogue with your dealer who I'm sure is committed to helping you right through.

    As for finger marks - they certainly don't degrade the sound and could be cleaned with, I suppose, a mild solution of washing up liquid on a cotton ball, NOT a tissue or kitchen cloth. At Harbeth we avoid touching the cone but would probably use isoprop alcohol and an industrial non-cloth tissue.

    WARNING! Do not press the cone! Do not rub the cone or you will introduce micro-scratches.
    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK


    • #3
      Originally posted by A.S. View Post
      WARNING! Do not press the cone! Do not rub the cone or you will introduce micro-scratches.
      Alan, will micro-scratches impact the sound quality?

      {MODERATOR'S COMMENT. This is not a question for Alan. What do you think?}


      • #4
        Originally posted by miniwatt View Post
        Alan, will micro-scratches impact the sound quality?

        {MODERATOR'S COMMENT. This is not a question for Alan. What do you think?}
        I would think that it will have an effect. The scratches will probable break up the surface and affect the sound wave propagation along the cone surface.

        But how many scratches/how deep a cut can the cone surface sustain before the sound degradation become audible? I would like to see some sort of experiment where scratches/dusts are introduced to the cone surface, and establish some sort of quantitative measure to a safety limit.

        I have been wanting to ask this question for a while. In a normal household there is bound to be aerosol spray and dusts and whatnots that will cumulate on the cone surface over time. I have been wondering at what point it will begin to make a audible difference.

        {Moderator's comment: Please forget it. Dust and scratches are relevant to LP records, not loudspeakers. The cone can be cut right through with negligible effect. This is a non issue.}


        • #5
          If that's the case, Alan's previous warning is purely for protecting the aesthetic only.

          {Moderators comment: Correct: the best tool for cleaning the cones if absolutely necessary is a photographer's air brush}