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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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M30 & SHL5 output

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  • M30 & SHL5 output

    What is the maximum acoustic output(dB) with 2 speakers in-room, of the M30 & SHL5

  • #2
    Re: M30 & SHL5 output

    The honest answer is 'something over 100dB at 1m' but as I've never measured the maximum sound pressure level (and respect my ears too much) I can't be precise.

    Not only that, tere are many factors which must be taken into account to give a meaningful number such as ....

    a) how far away is the microphone?
    b) are both speakers playing exactly the same (mono) signal?
    c) is the signal bandwidth-limited so that, for example, all deep bass and extreme HF are eliminated and do not reach the speakers?
    d) are we measuring long-term maxima or just a burst, and in both cases over precisely what time period?
    e) is permanent but minor damage permitted to the speakers?

    Harbeth - and indeed all predecessor BBC-monitor speakers are designed to be listened to at a moderate level. You can get an idea of what I think is moderate from the Video Vault of a listening test underway.
    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK

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    • #3
      Re: M30 & SHL5 output

      Do they both have the same mid/bass driver & crossover for that driver?

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      • #4
        Re: M30 & SHL5 output

        They have the same driver. They can't have the same crossover because a) the cabinets are of different sizes b) they have different tweeters c) .....
        Alan A. Shaw
        Designer, owner
        Harbeth Audio UK

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