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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.

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{Updated Oct. 2017}
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Distortion, specifications and sine wave vs. listening tests

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  • Distortion, specifications and sine wave vs. listening tests

    This was posted elsewhere. Informative food for thought.
    Sorry it's so long, he obviously had to fill a seminar slot.

    https://www.youtube.com/watch?v=2V6YN-mshmY

  • #2
    Persuasive

    Thanks very much for this link. It was fascinating. He is clearly not an accomplished teacher, but he is ironically funny and he knows his stuff.

    I think it persuasively shows that more measurement is key to better understanding, and that single figure specs are pretty meaningless, unlike graphs that cover the full range of conditions.

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    • #3
      The relative (in)audibility of clipping?

      Originally posted by ssfas View Post
      This was posted elsewhere. Informative food for thought.
      https://www.youtube.com/watch?v=2V6YN-mshmY
      Of particular note is the demonstration of clipping induced distortions - starting about 25 minutes into the video. The majority of the audience didn't appear to detect the onset of clipping until the distortion level exceeded 30%.

      Perhaps this would account for the claims by those who use demonstrably under-powered amplifiers that they hear no evidence of clipping.

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      • #4
        The fluffing-up of clipped bass sounds

        There was a link referred to here a few weeks ago (I've lost the link but downloaded the paper) to some research done by Dudley Harwood when at the BBC, the conclusions being that if the clipping/compression is gentle enough (no ringing or other nasties), we can tolerate 9dB of compression before it becomes audible.

        The smaller of the amps I make go 'wrong' in the bass long before I notice any misbehaviour in treble regions. Loud powerful synth-bass notes, kick drums etc. lose definition and sound a tiny bit like a fluffed-up stylus when the going gets tough. This is how I think a lot of valve amps clip

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        • #5
          Bass force

          Originally posted by DSRANCE View Post
          The smaller of the amps I make go 'wrong' in the bass long before I notice any misbehaviour in treble regions. Loud powerful synth-bass notes, kick drums etc. lose definition and sound a tiny bit like a fluffed-up stylus when the going gets tough. This is how I think a lot of valve amps clip
          Are you talking about bass clipping or simply the lack of valve amp power to properly control the speaker driver at low frequencies? That is why I gave up on valves, I took it to be a lack of brute force rather than a clipping issue.

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          • #6
            Advance again

            Just found this amp:
            http://advance-acoustic.com/en/hifi-...fier/96-x-i120

            Is Distortion < 0.1% too much ? or it is fine ? it does not say THD, is that important ?

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