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"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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Amp impedance setting for use with Compact 7 ES2

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  • Amp impedance setting for use with Compact 7 ES2

    Apologies in advance if this is a repeat question.

    I am using a Leben CS300 amp with my compact 7ES2 speakers. The amp has the option to be set to 4, 6 and 8 Ohms.

    What should I set it to for use with CS7ES2 - 6 or 8?

    I have read the impedance of the speakers is 6-8 ohms. Is this correct?

  • #2
    I have a similiar amplifier as yours; have set it to 6 ohms as I've strictly adhere to the SHL5 specification. btw, have you tried different setting? have tried fiddling with the different setting, but not much diff

    anyway, don't have much time to fiddle with the setting hence stick to 6 ohms. it sounds nice.

    is the setting of 4, 6, 8 ohms to match the impedance seen by the amplifier output for high impedance?


    • #3
      C7ES2 impedance

      When Martin Colloms measured the C7ES's (version prior to the 2's) for HFN&RR he classed them as 6ohm - the impedance dipped to a minimum of 4.7 ohms at 350Hz, but the curve is quite gentle. Colloms rated the ease of drive as 'average'.

      {Moderator's comment: You are referring to the earlier C7ES2, but the C7ES3 has a similar easy curve.}


      • #4
        C7ES2 impedance

        6 is more correct but I'd try both and see which setting you prefer.



        • #5
          Dynaco ST70 II 4-8 ohm setting

          My amplifer (Dynaco ST70 II) can be set to 4,8,16 ohm. Between 4 and 8 I prefer the second,I think it sounds better.