Two bass woofers in 3 way.

Discussion in 'Home Theater Projects' started by PasqualeF, Apr 23, 2003.

  1. PasqualeF

    PasqualeF Auditioning

    Joined:
    Apr 23, 2003
    Messages:
    11
    Likes Received:
    0
    I am looking at building a set of 3 way mains which have a tweeter, a mid woofer and two woofers for upper bass. Why do people use two woofers? The way they're wired (parallel) would result in an approximate gain of 6db (assuming the amp produces double output at half impedance). Is this done:
    1)To make up for a lower sensitivity compared to the mids? 2)Produce more output in that range (mid-bass)?
    3)Just for looks?

    Thanks for any help
     
  2. Michael R Price

    Michael R Price Screenwriter

    Joined:
    Jul 22, 2001
    Messages:
    1,591
    Likes Received:
    0
    You got all 3! But I would say the main reason is to boost output/dynamic capability - for lower frequencies in the 30-50Hz range that towers are designed to cover, twice as much power handling and displacement can't hurt.
     
  3. Brian Bunge

    Brian Bunge Producer

    Joined:
    Sep 11, 2000
    Messages:
    3,716
    Likes Received:
    0
    Also, using something like dual 8's gives you more surface area than say a single 10 but allows for a more narrow cabinet.
     
  4. Jonathan M

    Jonathan M Second Unit

    Joined:
    Jul 23, 2002
    Messages:
    267
    Likes Received:
    0
    All of the above is perfectly correct. The woofer is generally the main efficiency problem in a speaker system, due to both their inherent inefficiency compared to tweeters, and this is compounded by the baffle step. Usually the mid and tweeter need to be padded down quite a bit to fall inline with the woofer. Parallelling two woofers increases the overall efficiency of the system, and at the same time has the other advantages mentioned above: Less distortion, better power handling, more dynamic range etc.
     
  5. Jonathan M

    Jonathan M Second Unit

    Joined:
    Jul 23, 2002
    Messages:
    267
    Likes Received:
    0
    Sorry, Double post - no idea how or why - most bizarre.
     
  6. PasqualeF

    PasqualeF Auditioning

    Joined:
    Apr 23, 2003
    Messages:
    11
    Likes Received:
    0
    Thanks for the quick replies. I was asking because I will probably not use the exact same drivers in my project and was wondering if I will need 1 or 2 mid-basses.

    By the way, the tweeter in the design was also padded down. Is this to further offset the sensitivity?
     
  7. Dave Milne

    Dave Milne Supporting Actor

    Joined:
    Jul 2, 2001
    Messages:
    568
    Likes Received:
    0
     

Share This Page