When using simulation software...

Discussion in 'Home Theater Projects' started by Shawn Solar, Jun 4, 2004.

  1. Shawn Solar

    Shawn Solar Supporting Actor

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    Do you have to compensate for dual voice coils. If say you have dual 2 ohm coils would the T/S change whether it were series or parallel? For instance QTS, QMS and QES change in regards to the resistance? any formulas? thanks.

    I ask cause I'm working on a sub project with a friend(spl monster) using a driver with these parameters:

    RFR3115
    FS-22hz
    DC-resistance-2x2.16ohms
    QTS-.388
    QES-.41
    QMS-5.837
    SD-860cm^2
    VAS-98L
    Moving Mass-384g
    CMS-1.28E-04 m/N
    Voice Coil Inductance-1.74mH
    BL-12.85Tm
    XMAX-19mm
    SPL-88db
    Pmax-1000watts

    We are devising a plan on using a slot port for tuned to 35hz in a 21cuft enclosure using 4 drivers wired in voice coils in series and two woofers series then at the amp the 2 pair is wired in parallel for 4ohms. Then we may be making a baffle with a set of ports that can be tuned lower for SQ. They will fit through and cover the slot port with some sort of mounting system.
     
  2. Shawn Solar

    Shawn Solar Supporting Actor

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    Just to add in a new post. First I meant to change the title, second I am wondering if maybe he should build four new enclosures each with multiple ports. That way he could do a SVS thing and be able to change the tuning frequency. The main problem with it right now is even though its loud(155db) it don't sound good and he wants a combo system ie, be able to do spl and make a few adjustemenst for sq when he's cruising.
     
  3. Michael R Price

    Michael R Price Screenwriter

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    Shawn, the parameters don't really change but if enough power is available, series wiring may sound better due to improved damping factor. It seems perfectly fine to use 2 or 3 ports, with 2 ports closing one will change the tuning by 1/2 octave and with 3 ports, closing one reduces tuning by close to 1/3 octave. One of my friends uses a Tempest at home with 2 ports to switch between 15Hz and 21Hz tuning, which works fine. The problem is getting some kind of plug that stays stuck in the port!
     

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