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HUG - here for all audio enthusiasts

Since its inception ten years ago, the Harbeth User Group's ambition has been to create a lasting knowledge archive. Knowledge is based on facts and observations. Knowledge is timeless. Knowledge is human independent and replicatable. However, we live in new world where thanks to social media, 'facts' have become flexible and personal. HUG operates in that real world.

HUG has two approaches to contributor's Posts. If you have, like us, a scientific mind and are curious about how the ear works, how it can lead us to make the right - and wrong - decisions, and about the technical ins and outs of audio equipment, how it's designed and what choices the designer makes, then the factual area of HUG is for you. The objective methods of comparing audio equipment under controlled conditions has been thoroughly examined here on HUG and elsewhere and can be easily understood and tried with negligible technical knowledge.

Alternatively, if you just like chatting about audio and subjectivity rules for you, then the Subjective Soundings sub-forum is you. 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.

The Moderators' decision is final in all matters regarding what appears here. That said, very few Posts are rejected. HUG Moderation individually spell and layout checks Posts for clarity but due to the workload, Posts in the Subjective Soundings area, from Oct. 2016 will not be. We regret that but we are unable to accept Posts that present what we consider to be free advertising for products that Harbeth does not make.

That's it! Enjoy!

{Updated Nov. 2016A}
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Test equipment (reference-standard microphones)

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  • Test equipment (reference-standard microphones)

    As I mentioned recently, we have recently invested several thousand dollars in new test equipment. Although Bruel & Kjaer has always been at the heart of our test set, we have not had the luxury of duplication across the various sites that I may need to measure speakers: on the production line, in the test bunker (for grading drive units), at the Old Dairy (open space for measuing) or The Stable (mini deadroom) or at home. I have made do with 'clone' amateur test equipment - especially microphones, and that has introduced a degree of uncertainly which has wasted valuable time.

    So, back to B&K, the best, the most accurate, with traceable standards and a very long life. For example, here is the actual curve (also supplied as a mini-CD) for the best of the new microphone capsules we have just purchased from B&K Denmark http://www.bksv.com/.

    As you can see from the curve below the yellow zone reresents +/- 1dB, and this specimen deviates from perfectly flat by a maximum of only about 0.5dB at the very highest frequencies and is, for all practical purpsoses, perfect. Bigger picture here: http://www.harbeth.co.uk/images/B&Krefmic640.png

    An accurate microphone, a reliable and known acoustic space - even if not a perfelcty relection free one, and a flat amplifier (another sad story) are paramount should you wish to design quality speaker systems.

    We now meet our ISO9001 obligations in this important area.
    Attached Files
    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK

  • #2
    Frequency response of B&K microphone capsules

    Originally posted by A.S. View Post
    As you can see from the curve below the yellow zone reresents +/- 1dB, and this specimen deviates from perfectly flat by a maximum of only about 0.5dB at the very highest frequencies and is, for all practical purpsoses, perfect. Bigger picture here: http://www.harbeth.co.uk/images/B&Krefmic640.png

    An accurate microphone, a reliable and known acoustic space - even if not a perfectly reflection free one, and a flat amplifier (another sad story) are paramount should you wish to design quality speaker systems.
    I don't seem to be able to view the microphone frequency response curve mentioned above. Would it be possible to supply a working link?

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