1. Visit this thread for your chance to win a selection of Lionsgate action films on UV!
    Dismiss Notice

Pros and Cons of Front vs. Rear porting

Discussion in 'Archived Threads 2001-2004' started by Mark Fitzsimmons, Jul 5, 2002.

  1. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

    Joined:
    Aug 18, 2001
    Messages:
    539
    Likes Received:
    0
    I curious as to the differences of front and rear porting. My speakers (JBL S26) are front ported but other popular speakers are rear ported like the Paradigm Mini Monitors for example.
     
  2. Jason Wilcox

    Jason Wilcox Supporting Actor

    Joined:
    Feb 21, 2002
    Messages:
    652
    Likes Received:
    0
    you can make a great front ported speaker and a great rear ported speaker.....no real difference in my mind

    what bothers me is people who try to steer clear of rear ported speakers because they shouldn't be placed next to a wall.....no speaker should be placed next to a wall!
     
  3. felix_suwarno

    felix_suwarno Screenwriter

    Joined:
    Dec 2, 2001
    Messages:
    1,523
    Likes Received:
    0
    "no speaker should be placed next to a wall"

    why do they place speakers on the wall in theaters?
     
  4. Jason Wilcox

    Jason Wilcox Supporting Actor

    Joined:
    Feb 21, 2002
    Messages:
    652
    Likes Received:
    0
    ahh sorry....i shouldn't have said it as an absolute rule.....more like a majority of the time thing.....usually just makes the sound "boomy" and "bloated"

    i don't really see it as a necessity to stick away from the walls for surround speakers as they don't get that much action anyway ('cept for multichannel audio)
     
  5. Sebastian

    Sebastian Second Unit

    Joined:
    Apr 14, 2002
    Messages:
    361
    Likes Received:
    0
    You just don't want the port that is in the rear of the speaker enclosure to be facing too close to a wall. I think 6" is good enough.
     
  6. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

    Joined:
    Aug 18, 2001
    Messages:
    539
    Likes Received:
    0
    My mains are front ported and have about a foot between them and the wall, this sound like good placement?

    And if placing next to walls creates boomy bass, then why is it recomended to put subs in corners?
     
  7. Brian Fellmeth

    Brian Fellmeth Supporting Actor

    Joined:
    Jul 30, 2000
    Messages:
    789
    Likes Received:
    0
    Damn good question Mark. Boomyness is caused by a spike in the frequency response around a narrow band. When the source material plays through the spike, the bass suddenly jumps out of the soundfield. Placing main speakers close to walls increases the risk of a room induced spike toward the bottem of the sattelites range (80-200 Hz). The difference with a sub is that corner loading has the effect of amplifying all frequencies. The FR of a sub will be lumpy in any untreated room in any location. Putting it in a corner may make it lumpier or flatter. The advantage is that it will be louder at almost all frequencies. ITs like the corner is acting like a megaphone.
     
  8. Mike Veroukis

    Mike Veroukis Second Unit

    Joined:
    May 8, 2001
    Messages:
    455
    Likes Received:
    0
    Location:
    Canada
    Real Name:
    Michael
    I should also point out that putting the sub in the corner is not always the best place for it. For example, if your room is a perfect cube placing it in the corner is probably the worst place for it.
    Check out this link for a good way to pin point the best location for your sub.
    Here's a link for proper speaker placement.
    - Mike
     
  9. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

    Joined:
    Aug 18, 2001
    Messages:
    539
    Likes Received:
    0
    I think my speaker and sub placement is pretty solid. My placement goes hand in hand with the recomendations of audioholics. I did test sub placement and in fact corner placement is best in my room.
     
  10. matthew_rm

    matthew_rm Second Unit

    Joined:
    Dec 24, 2001
    Messages:
    379
    Likes Received:
    0
    My Klipsch RF3's are about 2 feet from the walls in my bedroom. They are not boomy. (Very clean and deep) When 6 inches from the wall the don't sound to good.
     
  11. ChrisAG

    ChrisAG Supporting Actor

    Joined:
    Aug 26, 2001
    Messages:
    503
    Likes Received:
    0
    I agree - 6" is too close for mine also (Mordaunt-Short 902 bookshelfs used as surrounds), but I can't move them further out without affecting other furniture. I'm guessing that a minimum of 9" is necessary to avoid the bass spike with bookshelfs, though 12" would be ideal.
     

Share This Page