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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.

Identifying system components for their sonic neutrality should logically proceed from the interpretation and analysis of their technical, objective performance. Deviations from a flat frequency response at any point along the signal chain from microphone to ear is likely to give an audible sonic personality to the system at your ear; this includes the significant contribution of the listening room itself. To accurately reproduce the recorded sound as Harbeth speakers are designed to do, you would be best advised to select system components (sources, electronics, cables and so on) that do not color the sound before it reaches the speakers.

For example, the design of and interaction between the hifi amplifier and its speaker load can and will alter the sound balance of what you hear. This may or may not be what you wish to achieve, but any deviation from a flat response is a step away from a truly neutral system. HUG has extensively discussed amplifiers and the methods for seeking the most objectively neutral among a plethora of product choices.

HUG specialises in making complex technical matters simple to understand, getting at the repeatable facts in a post-truth environment where objectivity is increasingly ridiculed. With our heritage of natural sound and pragmatic design, HUG is not the best place to discuss non-Harbeth audio components selected, knowingly or not, to introduce a significantly personalised system sound. 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 offerings there. There is really no on-line substitute for time invested in a dealer's showroom because 'tuning' your system to taste is such a highly personal matter. Our overall objective here is to empower readers to make the factually best procurement decisions in the interests of lifelike music at home.

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If some of the science behind faithfully reproducing the sound intended by the composer, score, conductor and musicians over Harbeth speakers is your thing, this forum has been helping with that since 2006. If you just want to share your opinions and photos with others then the unrelated Harbeth Speakers Facebook page http://bit.ly/2FEgoAy may be for you. Either way, welcome to the world of Harbeth!"


Feb. 2018
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DSP: Adjusting far field based on near field

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  • DSP: Adjusting far field based on near field

    Hello,

    Time ago in a thread in the HUG i saw an idea to do room correction (i can not find the thread now). It was to measure the speaker in very nearfield, then measure it in the listening position and create the curves to compensate for the room problems. That would make the speaker sound far field (with the rooms problems), like it sounds 15 cm from it.

    So this is different from having a curve or flat response to emulate with the correction.

    Yesterday i was reading information about ELAC brand subwoofer and i found thats the way they are doing room correction. In fact they create an iOS/Android app, and use the phone mic to measure the subwoofer, because that " bad" mic is used both in nearfield and farfield it does not need to be a good mic.

    I also saw they created a new amp with DSP, 100w 8 Ohm, that also have automatic room correction and i suppose same philosophy, what i dont know is if it could be used for speakers or only for a subwoofer.

    http://elac.com/product/debut-series...ted-amplifier/

  • #2
    Bargain ELAC?

    That ELAC amplifier is very interesting for more modest systems. 600 dollars for a 2x100 watt amplifier with digital inputs, subwoofer integration and dsp room correction is quite a bargain. It also looks good. My only question is about the real power output, as Elac does not specify how this is measured. If it is 100 watt peak, it would be a bit meagre for all but the smallest rooms.

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    • #3
      More info?

      Originally posted by willem View Post
      That ELAC amplifier is very interesting for more modest systems. 600 dollars for a 2x100 watt amplifier with digital inputs, subwoofer integration and dsp room correction is quite a bargain. It also looks good. My only question is about the real power output, as Elac does not specify how this is measured. If it is 100 watt peak, it would be a bit meagre for all but the smallest rooms.
      Looks promising, probably cool running and lightweight with class D. I do wish there was more information about the 'loudness' which they suggest can be tailored to suit, no online manual seems available. Also they describe some way of (automatically by the amp) monitoring the input voltage so it is only as needed (might fix any input clipping??).
      Getting to know my C7ES3

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      • #4
        Bad microphone?

        Originally posted by kerouack View Post
        Hello,

        Time ago in a thread in the HUG i saw an idea to do room correction (i can not find the thread now). It was to measure the speaker in very nearfield, then measure it in the listening position and create the curves to compensate for the room problems. That would make the speaker sound far field (with the rooms problems), like it sounds 15 cm from it.

        So this is different from having a curve or flat response to emulate with the correction.
        If the speaker is designed to perform flat (within its bandwidth) then I think the two things should not be different. 15 cm seems to me too near, at least for a full range multi driver speaker.

        Yesterday i was reading information about ELAC brand subwoofer and i found thats the way they are doing room correction. In fact they create an iOS/Android app, and use the phone mic to measure the subwoofer, because that " bad" mic is used both in nearfield and farfield it does not need to be a good mic.
        Using the same "bad" instrument to make different measurements could maybe result in a precise but not accurate set of measures, if the instrument is always "bad" in the same way. I don't know if it will suffice for the purpose of this correction system.

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        • #5
          Peak power?

          Precise specifications of the ELAC amplifier are still subject to change, but unfortunately 100 watt is peak power or something similar.

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