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Thread: JR149 - foam

  1. #1
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

    Default JR149 - foam

    does the foam above the tweeter on a JR149 actually do anything?



    If not I just want to strip it off.
    SS
    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

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  2. #2
    Join Date: Oct 2011

    Location: Charente, France

    Posts: 3,531
    I'm Nodrog.

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    I was told it helped damp the metal cover although I couldn't hear any vibration when the foam fell off mine.

  3. #3
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    It's likely there to address a diffraction issue at the top 'lid' lip. You could replace it with something less ugly though.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  4. #4
    Join Date: Oct 2011

    Location: Charente, France

    Posts: 3,531
    I'm Nodrog.

    Default

    Quote Originally Posted by walpurgis View Post
    It's likely there to address a diffraction issue at the top 'lid' lip' You could replace it with something less ugly though.
    Sounds more likely!!

  5. #5
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

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    I thought it could be a diffraction thing, just not sure thats all. Well I've whipped it off now so I will have a listen and see if it makes a difference.
    SS
    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

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  6. #6
    Join Date: Apr 2012

    Location: Co. Durham

    Posts: 1,966
    I'm Stephen.

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    How are the grills held in place?

  7. #7
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    Any diffraction effects may be difficult to pin down just by listening. They will almost certainly vary audibly according to the listener's position in relation to the vertical dispersion pattern of the tweeter.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  8. #8
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

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    Geoff,

    I dont think my lug 'oles will be able to tell much difference so I think its a case of listening and seeing what happens. I can always fit the foam with a bit of velcro which is a lot nicer than the crappy glue they used originally.

    Andy
    SS
    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    VALVE
    PRE
    Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker



  9. #9
    Join Date: Aug 2012

    Location: Sunny Portsmouth

    Posts: 9,165
    I'm TheMostHonestPersonYouWillMeet.

    Default

    Andy I have no idea what the foam does but my LS 3/5a, using the same T27 tweeter, has foam surrounding it

    I've enclosed a pic of the T27
    Attached Images Attached Images
    Bev


    Mark Levinson N°390s CD Through:Atlas Elektra XLR's To: Mark Levinson N°383 To: Magneplanar .7's

  10. #10
    Join Date: Dec 2011

    Location: Far Away

    Posts: 1,396
    I'm Gone.

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    I restored a pair of JR149s for a record dealer about 15 years ago, without the foam the imaging suffers very slightly so it is a diffraction thing. The original glue was as you say crappy, so I used double sided tape.

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