• RE: Exactly! - Beardy 21:24:20 11/04/24 (1)
  In Reply to: RE: Exactly! posted by E-Stat on November 04, 2024 at 07:18:49

  
  With two drivers you turn one forwards and the other backwards and the one facing backwards is wired out of phase (-+ instead of +-). So both drivers move in the same direction at the same time (in phase). The reason is because if the driver motion is non symmetric (it moves differently forwards than backwards), then having one driver face forwards and the other backwards cancels out this source of distortion.
  
  Three is an odd choice. Driven by the needs of more surface area versus the inconvenience of four?
  
  

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  • RE: Exactly! - emailtim 23:01:58 11/04/24 (0)
    In Reply to: RE: Exactly! posted by Beardy on November 04, 2024 at 21:24:20

    The choice of 3 - 14 Ohm drivers is because of the combined load (4.6 Ohms) on the servo plate amp.

    The servo plate amp could not drive 4 - 14 Ohm drivers. Aggregate impedance (3.5 Ohms) would be too low.

    SW-12-16 parameters:

    FS 28.3Hz
    BL 14.07
    Mms 108g
    VAS 100L
    Qms 2.8
    Qts 0.85
    Sd 490cm^2
    Re 14 Ohm
    X-Max 16 mm

    Ideally, you would want even numbers of drivers to cancel out non-lineararities of the forwards and backwards cone movements.
    .
    
    2022/03/30 Historical Records CENSORED
    

    • https://gr-research.com/product/sw-12-16fr-servo-sub-woofer/   (Open in New Window)

    
    

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    Edits: 11/04/24

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