Nerdy Jamo Subwoofer SW3 -> S3 design question
Welcome to the AudioShark Forums.
Results 1 to 2 of 2
  1. #1
    Junior Member
    Join Date
    Sep 2019
    Location
    Denmark
    Posts
    1
    Post Thanks / Like

    Nerdy Jamo Subwoofer SW3 -> S3 design question

    Hi,
    I have come across and old Jamo SW3 Sub with two dedicated S3 satellite speakers. I have changed the two bass units (defect foam surround) . I reverse engineered the Sub in order to understand the Isobaric design and found that Jamo has designed the SW3 Sub to be INVERTING. A positive pulse on (+) will make the Sub suck in air meaning that the dedicated S3 speakers MUST (AND IS) connected in reverse (+) to (-). Strange I thought, because if you want to use one AMP output for the Sub and another for the Satellites you need to connect the Satellites in reverse.

    I have attached the schematics of the system (original inverted Jamo design together with my proposal of a non-inverted Sub design).

    Now for the question:
    Can anyone see and 'pros' and 'cons' for the two designs?

    Please note that I will use two Warfedale 9.0 bookshelf speakers together with the Jamo SW3 Sub and I would like to be able use a separate AMP output for the Warfedales. This will eliminate the 72uF bipolar caps in the Sub.


    Thanks for reading - I hope to hear from someone...

    Best regards
    zEnterHacker
    Attached Images Attached Images

  2. #2
    Super Moderator
    Join Date
    Apr 2013
    Location
    NY
    Posts
    16,392
    Post Thanks / Like

    Re: Nerdy Jamo Subwoofer SW3 -> S3 design question

    Welcome to the forum, thank you for joining.
    Joe

    Avantgarde Duo XD, Klipsch RB-75, Klipsch RP-160M, JBL 590.

    Accuphase E-650 w/ Dac, Job INTegrated, Naim Supernait 2 w/ HiCap-DR.

    Conrad Johnson GAT2, Wyred 4 Sound STP-SE Stage 2, Misho Myronov Wooden pre, Linear Tube Audio MZ2.

    First Watt SIT-1 monos, Misho Myronov Wooden amp, First Watt SIT-3, Luxman MQ-300, Job 250 Monos, Valvet E2se, NuForce STA200, AkitikA GT-102 amp, Cary 300B SE monos, ASL Wave monos, Dennis Had 45 monos.

    Lumin U1 mini, ModWright Ultimate Sony XA-5400ES, Audio Mirror Tubadour III NOS R2R Tube Dac w/ upgrades.

    Burmester 948, McIntosh MCLK12, Kimber Kable, Siltech, Cardas, Avanti Audio cables.

 

 

Tags for this Thread