Announcement

Collapse

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}
See more
See less

The unique Harbeth RADIAL bass/midrange drive unit

Collapse
This is a sticky topic.
X
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • The unique Harbeth RADIAL bass/midrange drive unit

    An introduction to loudspeaker cones presented at the Harbeth HQ conference table. Hope that you take something useful away from this video.

    Loading the player ...
    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK

  • #2
    Harbeth video: The weakness of simple cones: Part 2

    Here is a follow-up video where we look at the ability of the speaker cone to perform its primary function, namely, to operate as a piston. To generate power, a piston has to be able to move as a solid entity, and in the case of a speaker cone, to press on the air in the room and avoid deformation when moving inwards and partially compressing the air in the speaker cabinet. Normal air is surprisingly heavy - 1.2kg per cubic metre - and the force needed to press against the air in the listening room, and to resist the air in the room pressing back on the cone requires that cone to be adequately strong. But is it? Let's see ....

    Loading the player ...
    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK

    Comment


    • #3
      Inside the moulding machine (dangerous!)

      From the archives, a picture of me examining the core (male) part of one of our mould tools, when opened as it would be at the end of the injection moulding cycle. The mould is firmly clamped shut for a few seconds as the plastic is squirted into the cavity, then opened to allow removal of the moulded part.

      Because the high-gloss surface finish is so important to the Harbeth cone, we cannot allow the cone to be automatically popped-off the tool, as is normal for injection moulded parts, as it would drop down into a heap and one cone would scratch another. So, we have to have a machine minder who controls the injection moulding machine and its process control computer, makes sure it has a continuous supply of granules, and most important, lifts the hot just-moulded cones out of the cavity without deforming them.

      It's quite a business injection moulding, but it does make completely repeatable cones, and it is the main factor behind for the unique Harbeth sound. If there was a cheaper, easier, less time consuming way of achieving that sound, I'd do it; but there isn't.

      Click image for larger version

Name:	Inside_tool-sc.jpg
Views:	2
Size:	117.0 KB
ID:	63133

      Oh, by the way: I ensured that the safety interlocks were in place before I ventured into the open tool, because when the two halves are pressed together by hydraulic rams, they will crush anything in their way with impunity.
      Attached Files
      Alan A. Shaw
      Designer, owner
      Harbeth Audio UK

      Comment

      Working...
      X