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HUG - here for all audio enthusiasts

At its inception ten years ago, the Harbeth User Group's ambition was to create a lasting knowledge archive. Knowledge is based on facts and observations. Knowledge is timeless, independent of the observer and can be replicated. However, we live in new world in which objective facts have become flexible, personal and debatable. HUG operates in that real world, and that has now been reflected in the structure of HUG.

HUG has two approaches to contributor's Posts. If you, like us, have 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 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 can be readily understood by non-experts and tried-out at home without deep technical knowledge.

Alternatively, if you just like chatting about audio and subjectivity rules for you, then the Subjective Soundings area 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. From Oct. 2016, Posts in the Subjective Soundings area will not be spell checked or adjusted for layout clarity. 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.

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

That's it! Enjoy!

{Updated Jan. 2017}
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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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