Infinity RS3b's Why so harsh sounding and virtually no bass?

Discussion in 'Infinity Loudspeakers' started by ausman1000, Jan 2, 2018.

  1. Lo-Fidelity

    Lo-Fidelity AK Subscriber Subscriber

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    668
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    Houston
    Mine was the same way.

    The original owner, poor guy, paid good money to have them reformed, and never got to hear them hooked up properly.
     
  2. ausman1000

    ausman1000 AK Subscriber Subscriber

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    Does anyone have a preferred setting for the rear panel attenuators? I currently have them set half way (or straight up).
     
    Last edited: Jan 7, 2018
  3. bluescat

    bluescat Active Member

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    Location:
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    I think this is the foam you want: http://www.thefoamfactory.com/opencellfoam/filter.html
    You would want the 1/4 " height. The PE link above is for 1/2" height, which in my opinion would be too thick.
     
  4. swechsler

    swechsler Frog Whisperer

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    It looks like that foam is meant to be acoustically transparent, which is exactly what you don't want - the foam around the mids and tweeters is meant to be acoustically absorbent. Wouldn't closed-cell foam be a better bet?
     
  5. bluescat

    bluescat Active Member

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    Location:
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    The foam that I rubbed off of my IIIA's was open cell, but although it looked original, I cant swear that it was. I have never replaced the foam, as I am not an audiophile, and I couldn't hear a difference with or without the foam.
     
  6. ausman1000

    ausman1000 AK Subscriber Subscriber

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    Yes, I would think that the foam would need to be acoustically absorbent otherwise why would there have been foam there in the first place? Absorbency should also help with the slight brightness of this model I would think.
     
  7. tubed

    tubed Lunatic Member

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    open cell - absorbent
     
  8. ausman1000

    ausman1000 AK Subscriber Subscriber

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    Open cell is absorbent versus closed cell so yes that makes sense.
     
  9. Tedrick

    Tedrick Infinity-phile

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    6,458
    Location:
    Gainesville, FL
    The firm charcoal open cell foam is a better acoustic choice in this application. The filter/speaker foam is fairly acoustically transparent, so will not do much to attenuate reflections from the cabinet. Link: http://www.thefoamfactory.com/opencellfoam/charcoal-F.html
     
    ausman1000 likes this.
  10. ausman1000

    ausman1000 AK Subscriber Subscriber

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    LOL I am listening to them right now with my newly acquired Pink Floyd SACD dark side of the moon. I have decreased slightly the attenuation of both mid and high using the rear panel controls due to brightness. Wondering if the foam will help with this?
     
  11. Tedrick

    Tedrick Infinity-phile

    Messages:
    6,458
    Location:
    Gainesville, FL
    Good chance it will. I run my IIIb's with both level controls in the neutral position (i.e. 12 o'clock) and they sound pretty balanced. Infinity put that anti-diffraction pad around the Polydome and EMIT for a reason.
     
  12. ausman1000

    ausman1000 AK Subscriber Subscriber

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    I agree, they did it for a reason, and I will replace that foam that is basically missing on mine. I'm also noticing it depends a lot on the source material, and this of course would apply to any speaker. I am currently listening to Susannah McCorkle and they sound superb with all controls dialed down by one "dot". Piano and vocals are very enjoyable! They are really quite remarkable sounding speakers.
     
  13. srb02

    srb02 "Infinity Speaker" Man Cave

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    Location:
    Taunton, Mass
    I used the type Tedrick mentioned, from Foam-factory.
    it's a chore to cut the edges nice and straight, PATIENCE.
    you''ll have enough to do them 2 or 3 times anyway. :thumbsup:
    I also ran mine w/ level controls at 12.

    BEWARE: Your Infinity quest has begun !!!!!!!!!!!

    my 2 cents Stu
     
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