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Ashdown Acoustic Radiator 2, amp

Discussion in 'Electronic Repair' started by N_Cook, Jun 11, 2013.

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  1. N_Cook

    N_Cook Guest

    It was only when I saw the IEC on the rear that I realised it was not 1960s,
    scuffed red mock leather covering, large thick leather handle, "ivory" knobs
    , that cream stove enamel used on a lot of medical kit etc of the era after
    the crackle finish of the 40s/50s.
    Now I've seen it all. To get the amp out you need to remove a speaker to
    release the speaker wires internally. But its a dummy speaker, presumably
    the 2 in the model name means 2 speakers. Basket , suspension , kevlar
    looking skirt, and cone , only. No pig tails or holes for pigtails or Voice
    coil or magnet. So if these were off a production line, how were they
    further processed? 4x3 sets of holes in the basket for what I would have
    thought were screw holes for a magnet , but sealed off by the seated cone.
    Would they glue in VC to the cone and magnet glued in to the basket with
    some sort of active monitoring of sound output , while posistioning in the
    uncured glue?
    Problem is the otherwise Ashdown Bass amp common symptom of loss of output ,
    returning a few minutes later, but this one will then continue for an hour
    or more with no drop-out. Not had a chance to power up yet , to investigate
     
  2. N_Cook

    N_Cook Guest


    Never seen one . I've seen holes in boxes called adiabatic resonators , yes,
    so I'd believe anything was possible.
    What is an active loudspeaker , if not an acoustic radiator? The company
    blurb refers to 2 speakers which to my mind implies 2 of the same sort of
    speaker . Eiter 2x active speakers or 2x passive speakers which would likely
    result in a lot of returns
     
  3. gregz

    gregz Guest

    Normal passive has no coil, but it might be there to damp, mostly over and
    under resonance. Most effective below resonance, so the cabinet does not
    cause overextension below driver resonance.

    Greg
     
  4. Phil Allison

    Phil Allison Guest

    "Ron Johnson"
    ** Ha, ha.
    ** A passive radiator is simply another form of tuned port - instead of
    the moving mass being simply the air enclosed by the tube, the cone of the
    radiator acts as the moving mass. The spring is always provided by the air
    trapped in the box.

    The main advantage is that it allows small cabinets to be tuned to low
    frequencies and with a large moving surface area.

    In such cases, a similar frequency air only port would be inconveniently
    long and have a too small a surface area - the result of which is a high
    level of chuffing noise and strong third harmonic generation.

    As with an air only port, the cone motion of a radiator supports the output
    of the cabinet in the lowest octave and will be the main source of sound at
    box resonance.


    .... Phil
     
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