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Fitting speaker Bungs.

Discussion in 'audio' started by griffin10010, Apr 5, 2021.

  1. griffin10010

    griffin10010 pfm Member

    I have B&W 603 series 3 speakers, floor standing. What affect will there be if I fit the midrange rear
    speaker bung. Speakers are up against rear wall. I don't have bungs to fit and don't really fancy using socks. Thanks.
  2. daytona600

    daytona600 Registered User

    Bungdit Din
    Durmbo, the caretaker and psd122 like this.
  3. Mr Pig

    Mr Pig ^'- -'^

    How the hell should we know? You're welcome :0)

    What's up with socks? Don't you have any clean ones?
  4. manicatel

    manicatel pfm Member

    What’s wrong with using socks just as a temporary measure to hear what bungs do?
    My take is that bungs reduce bass output from the port ( obviously) especially when the speakers are sited close to the front wall.
    However the downside is that in doing so, bungs also take away some life & air, closing the sound down. I wouldn’t use bungs unless you really had to. An alternative to foam bungs is a bundle of drinking straws shoved into the port. It acts like a very open celled material, reducing rather than negating the port. Only my opinion.
    Durmbo likes this.
  5. Fatmarley

    Fatmarley Agnostic

    I once made a tube out of 100% wool felt material of a couple of millimetres thick and lined the inside my ProAc Studio 100 ports. That tightened up the bass, but without ruining anything else. Another option that's supposed to work well is filling the ports with drinking straws.

    A lot of people complain that foam bungs either attenuate the bass too much or kill the midrange.
    Durmbo likes this.
  6. djftw

    djftw Heterodox Member

    It's a long time ago I had these speakers (I sold them to my parents who still have them) but IIRC the front port is for the aluminium bass driver and rear port for the Kevlar mid bass. The ports are tuned to different frequencies, but both are in play in the bass frequencies, it is a "2.5 way" rather than true 3 way design. I did experiment with the bungs, but eventually gave them up as a bad job. I later found some of the booming I had been trying to solve seemed to be down to the amp struggling to keep them under control, they dip below 3R at some frequencies and need an amp that can cope with that; power is part, but not all of it, not all powerful amps like that kind of load. With a solid (i.e. concreate or masonry) back wall they can actually be very well behaved as close as 8 inches, maybe even less to a back wall so long as they're away from corners. With a wobbly stud wall they are a nightmare and need to be 3 feet or more away to not turn it into a sounding board!
    Sibbers likes this.
  7. Durmbo

    Durmbo not French

    Absolutely my experience. Bungs strangle the sound. I too can recommend drinking straws.

    Another method I've used is to lengthen the port with a tube of cardboard. Experiment until you get the desired effect. Lining the port with felt as described by Fatmarley sounds effective.
  8. Rick_F

    Rick_F pfm Member

    Don't use socks if it's a large port, they may fall in! Try packing foam that can be compressed to fit. Results can be good and bad.
  9. Mr Pig

    Mr Pig ^'- -'^

    Yes, I think the OP might be short of socks but don't tell him I told you that.
    Rick_F likes this.

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