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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Slight hum like sound

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  • #16
    Low frequencies from your Air Conditioner!

    Originally posted by STHLS5 View Post
    I removed the interconnects, played with the mono bridge switch and balanced/regular switch and now the speakers are noiseless.
    I am wrong again. The noise is still there but the good news is I managed to identify the culprit. The hum like sound is actually heard at certain locations in my room even with my system turned off. It only audible when the air cond is turned on. The strongest is at the room boundaries, especially near the rear right corner and from the speakers.

    Interestingly, my air cond is usually set in Ultra Silence mode and you can only hear the sound of air rushing out from the air cond which somehow changes to low frequencies sound and get reinforced at the room boundaries.

    What I don't understand is why I get the sound near or from the SHL5? Could it be the port tunes the low frequencies and output them through the woofers? It is bit difficult to pin point the exact location. Anyone, please?



    • #17
      Hi STHLS5

      Perhaps there is some sinusoidal effect kicking in and your speakers so happen to be at the peak of it. It could even be as simple as not pointing the louvres of your air conditioner towards your speaker but down towards the floor.

      I do encounter a hum in one of our rooms caused by building services, a pump perhaps, and if I draw an imaginary line (or even a chess grid) and move along it, the hum actually phases in and out (as little as 15cm) as I move in one dimension (and the other dimension as well). You can perhaps find a point where the hum decreases to a level where you can no longer perceive it. Trial and error (moving speaker and listening position) might get rid of it.

      And the last point about the sound changing, reminds me as a child sitting in front of a table fan and making sounds into it. They sound will indeed come out sounding odd.

      If all this doesn’t work, perhaps its time to ditch the cooler and start listening to music in the lightest clothing you have.


      • #18
        Originally posted by kittykat View Post
        .. the hum actually phases in and out (as little as 15cm) as I move in one dimension...
        It looks like a 1150Hz wavelength. That must be really annoying :))



        • #19
          Recently my "king" hum too when i accidently switch over my preamp selector switch to an unused (rca) output. No hum before. Switch back to connected (XLR) output the hum is gone.