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HUG - here for all audio enthusiasts

INTRODUCTION- PLEASE READ FIRST TO UNDERSTAND THIS FORUM!

"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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"Nothing new under the sun"? The challenge of evaluating audio equipment

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  • "Nothing new under the sun"? The challenge of evaluating audio equipment

    This thread relates to the challenge of evaluating audio equipment. We may think that this is a new challenge, but turning the written technical specification into an universally agreed subjective score is a very old problem indeed - as we will show.

  • #2
    'Evaluating loudspeakers' - a plea from 1970

    A reader of HiFi News writes about the poor correlation between the manufacturers technical specifications and how a loudspeaker actually sounds. The author comments that since his first interest in audio in the 1940s scant attention has been given to this subject.

    It's shocking how little progress has been made since 1970 (or even 1940s) despite the millions of words written by journalists over that period.

    (The Harbeth company was founded in 1977. In 1970 the current BBC monitor would have been Dudley Harwood's LS5/5, and the LS3/5a had not been invented.)
    Attached Files

    Comment


    • #3
      Originally posted by HUG-1 View Post

      It's shocking how little progress has been made since 1970 (or even 1940s) despite the millions of words written by journalists over that period.
      It's interesting to note that the content of the letter from the MCPS immediately above Mr. Harms' is also still as pertinent.
      Paul

      "If all else fails, read the instructions"

      Comment


      • #4
        "The language of hi-fi" - Reg Williamson in 1977

        Originally posted by Paul G Smith View Post
        It's interesting to note that the content of the letter from the MCPS immediately above Mr. Harms' is also still as pertinent.
        And again, from the archives, I stumbled across this letter from the highly regarded audio engineer, Reg Williamson - who knew a thing or two about amplifier design.

        "The language of hi-fi" - a reader's letter from Wireless World magazine October 1977, the year of Harbeth's founding. What's changed? And is it just the audio industry which is deeply conservative? Mr. Williamson's plea about the responsibilities of journalists to convey technical matters may have gone unheard. Regarding the point he makes in his closing lines about chasing absurdly low distortion figures we are covering distortion here.

        To illustrate his comment, harmonic distortion of several percent is very normal and an unavoidable by-product of wiggling a diamond on the end of a rod in a channel hot-cut into a plastic disc - i.e. the gramophone record. But it doesn't seem to bother those who enjoy vinyl and hence, achieving 0.0004% distortion is an exercise in futility.

        >
        Attached Files
        Alan A. Shaw
        Designer, owner
        Harbeth Audio UK

        Comment


        • #5
          Terrific letter, that.

          It makes me wonder. In the past, you've added noise to a digital track to simulate the sound of an LP. But there's a difference between noise, which is random, and harmonic distortion, which is by definition non-random.

          Would it be possible to add a carefully contoured amount of harmonic distortion to a clean digital recording to more closely simulate the LP experience? And might some listeners actually prefer the sound to that of a completely undistorted signal?

          ("Distortion" is such a negative word - maybe we should call it "harmonic enhancement".)

          Comment


          • #6
            Try this

            http://www.izotope.com/products/audio/vinyl/

            Comment


            • #7
              Anyone able to pass some audio through this software device and let us hear degrees of 'enhancement'?

              Comment


              • #8
                Izotope

                It seems to offer control over a number of parameters, but not - unfortunately - harmonic distortion. Maybe there's a business opportunity here! (But if there is, I claim trademark rights over the term "harmonic enhancement".)

                Comment


                • #9
                  Try the AddDistortion App here

                  http://www.audiosignal.co.uk/freeware.html

                  and read

                  http://www.aes-uk.org/category/past-meeting-reports/

                  Which I have not yet had time to digest.

                  Comment


                  • #10
                    Originally posted by A.S. View Post
                    And again, from the archives, I stumbled across this letter from the highly regarded audio engineer, Reg Williamson - who knew a thing or two about amplifier design.

                    "The language of hi-fi" - a reader's letter from Wireless World magazine October 1977, the year of Harbeth's founding. What's changed? And is it just the audio industry which is deeply conservative? Mr. Williamson's plea about the responsibilities of journalists to convey technical matters may have gone unheard. Regarding the point he makes in his closing lines about chasing absurdly low distortion figures we are covering distortion here.

                    To illustrate his comment, harmonic distortion of several percent is very normal and an unavoidable by-product of wiggling a diamond on the end of a rod in a channel hot-cut into a plastic disc - i.e. the gramophone record. But it doesn't seem to bother those who enjoy vinyl and hence, achieving 0.0004% distortion is an exercise in futility.

                    >
                    but distorted distortion is surely worse again?
                    One lot of distortion may be acceptable, perhaps that of the microphone, but in my experience it's the combined effect of added distortions that needs to be kept to a minimum for a life-like listening experience. For distortion read anything that makes a difference between the original sound and the reproduced sound. It's not only harmonic distortion that matters. I find intermodulation distortion to be even more offensive.
                    Paul

                    "If all else fails, read the instructions"

                    Comment


                    • #11
                      Originally posted by HUG-1 View Post
                      A reader of HiFi News writes about the poor correlation between the manufacturers technical specifications and how a loudspeaker actually sounds. The author comments that since his first interest in audio in the 1940s scant attention has been given to this subject.

                      It's shocking how little progress has been made since 1970 (or even 1940s) despite the millions of words written by journalists over that period.

                      (The Harbeth company was founded in 1977. In 1970 the current BBC monitor would have been Dudley Harwood's LS5/5, and the LS3/5a had not been invented.)
                      It's nice to see Wilfred Harms' name in print again. When he retired from Civil Engineering he worked for Malcolm Jones at Falcon Acoustics in Bexhill for a number of years, and was unusually helpful with customer correspondence.

                      Comment

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