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HUG - here for all audio enthusiasts

The Harbeth User Group is the primary channel for public communication with Harbeth's HQ. If you have a 'scientific mind' and are curious about how the ear works, how it can lead us to make the right - and wrong - audio equipment decisions, and about the technical ins and outs of audio equipment, how it's designed and what choices the designer makes, then the factual Science of Audio sub-forum area of HUG is your place. The objective methods of comparing audio equipment under controlled conditions has been thoroughly examined here on HUG and elsewhere and should be accessible to non-experts and able to be tried-out at home without deep technical knowledge. From a design perspective, today's award winning Harbeths could not have been designed any other way.

Alternatively, if you just like chatting about audio and subjectivity rules for you, then the Subjective Soundings area is you. If you are quite set in your subjectivity, then HUG is likely to be a bit too fact based for you, as many of the contributors have maximised their pleasure in home music reproduction by allowing their head to rule their heart. If upon examination we think that Posts are better suited to one sub-forum than than the other, they will be redirected during Moderation, which is applied throughout the site.

Questions and Posts about, for example, 'does amplifier A sounds better than amplifier B' or 'which speaker stands or cables are best' are suitable for the Subjective Soundings area only, although HUG is really not the best place to have these sort of purely subjective airings.

The Moderators' decision is final in all matters and Harbeth does not necessarily agree with the contents of any member contributions, especially in the Subjective Soundings area, and has no control over external content.

That's it! Enjoy!

{Updated Oct. 2017}
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My new design ;-)

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  • My new design ;-)

    Hi, I have taken up speaker building again, and my first project is a double chamber reflex enclosure of 110 litres, based on a pdf by mr. George L. Augspurger from the sixties, a Gamma BBK 200 and a Visaton TW 6 NG cone tweeter, asymetrically positioned.
    The cabinet will be 11mm plywood with 11mm bitumen glued to all internal surfaces, 25mm 'sheepwool' dampings to the top, left, and back interior of the enclosure, wich has a ratio of 3 : 2 : 1. The front panel will be covered by felt or similar around the elements to eliminate edge reflections. The two drivers will be connected to an external crossover by four posts, or to an amplifiers for each driver with an active crossover.
    So, that's my plan, and If you think it stinks, tell me about it ;-)

  • #2
    Is the design you are using the one presented starting on page 41 in this publication?
    http://www.americanradiohistory.com/...ld-1961-12.pdf

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    • #3
      Yes, it is. I have downloaded a ton of pdf's, covering what I suspect are necessary aspects of loudspeaker design, and this is my choice for the box type.

      The crossover will be a 4th-order Linkwitz-Riley ,with built in bulb-type soft overload protection and possibly some traps to tame peaks in the response.

      I also plan to use the grille to possibly hold acoustic lenses inside to increase mf / hf acoustic power dispersion into the listening space.

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      • #4
        I recall well the days of hifi DIY, but with respect, this user group is paid for and run by a speaker manufacturer. Would a thread about DIY cars lie comfortably on the Mercedes Benz official forum or even pass moderation there?

        Assuming that those who spend time on DIY speakers are not, logically, in the market for Harbeth speakers, may we please understand the strategy behind this thread?
        Alan A. Shaw
        Designer, owner
        Harbeth Audio UK

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        • #5
          It was posted in Speaker Design, I hoped to learn something, but I get it, my mistake. Scrap the thread and my account and I will be on my way.

          And, congratulations, Harbeth speakers sound fantastic :)

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          • #6
            You are welcome here, but actually (and perhaps surprisingly) loudspeaker design is not, it would seem, discussed here - I suppose that it's taken for granted.

            Consequently, I'm sure to learn more about speaker design there are better places on the net. And in all honesty, designing speakers is my income, so there is a practical limit on how much information I am able to give out for free. It's painful to watch somone struggling to make sense of a DIY design when far greater personal experience is needed to problem solve.

            One thing I can tell you though is this. There are many web sites, text books and software programs that can guide you along the way - but there is not one single text book or web site that can tell you how your creation will actually sound. You should be able, with a little skill, to create a speaker with a flat frequency response or whatever you wish. I learned how to do that with a year or so of graft provide that you have some audio measuring equipment. Nothing fancy needed. The problems really start for the would-be speaker designer when the test gear says 'flat' but the ear says 'horrible'.

            The solution, in my opinion, is always to revert to speech as a test source. Definitely not music. Make speech sound credible, as if someone is actually in or on the face of the speaker cabinet, and maybe music will sound OK. Not the other way round.

            Critiquing well recorded speech on loudspeakers is a lost art and vital skill. Learn it. Master it.
            Alan A. Shaw
            Designer, owner
            Harbeth Audio UK

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            • #7
              Thanks! I agree totally, and I have never forgot hearing the news from a pair of AR 3Ai's via a 200W Pioneer receiver at my local hifi pushers demo room. Glass doors and a thick carpet. It sounded dry, just as if the reporter was a real male person right in front of me, then the news ended and the music program continued, and the deep bass came right out of the blue, also with fantastic highs.

              A great lesson. Keep up the good work.

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              • #8
                I'm sure we all have special experiences like that. I vivdily recall the very first track I played on my home-made quasi-LS3/5a speakers (they must have been way-off spec: I hand wound the crossover coils and I cannot recall how I could possibly have known their true inductance values ...). It was the very hot summer of 1976 (?), ladybirds everywhere. The track was Cani Statton, Young hearts run free. Sounded fabulous on 45. Forty one years ago. Seems like yesterday.
                Alan A. Shaw
                Designer, owner
                Harbeth Audio UK

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