acoustic improvement behind monitors

Discussion in 'Pro Audio' started by Thomas Thiele, Aug 1, 2003.

  1. Hi!

    I got some acustical questions.
    My monitors (JBL LSR32) stand 1m before the wall as you can see on
    this picture.

    I know that is not ideal but there is no other solution for me.
    I cannot build the monitors in the wall.
    What can I do to improve the sound?

    I don't hear any comp filtering problems. But the sound is not
    completely clear.
    It a little bit diffuse, so I tend to mix too dry.

    As I can see on this photo:

    they must have the same problem with monitors. But I bet the acoustic
    there is very good.

    What about a heavy curtain behind the monitors? It should absorb some
    bass frequencies, shouldn't it?
    Thomas Thiele, Aug 1, 2003
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  2. Thomas Thiele

    umbriaco Guest

    A curtain won't do much to absorb bass. You'll need a bass trap for that.
    A curtain will absorb above 1K and should help focus your imaging.
    RAther than a curtain, I would cover all walls and ceiling forward of your
    mix position with 2" thick Owens Corning 703.
    umbriaco, Aug 1, 2003
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  3. I know. That's why I often stand up when I'm mixing.
    It was only a provisional solution. And like all provisoriums it
    remains longer...
    Only the two sides you see it's wood. The wood plates are ca. 10cm
    from the concrete wall. In between there is some woolem material. The
    other side left from the monitors are with a window and some carpet
    like surface. The wall behind the monitors is covered with the usual
    acoustic foam. SOme kind of inverse LEDE.
    For your understanding: This studio was build by someome others. I
    only rent thei rooms since they only make PA and no studio anymore
    (they have to live from this job...). Advantage is that I can get a
    lot of additional stuff (FX, Miks etc.) and have ready studio rooms.
    It may sound sick but the rooms are better than the most other
    semiprofesional studios in my hometown. There is no really big music
    studio there but lots of digi001-studios. (so my clients do not come
    from my hometown...)
    With the old near field monitors the room acoustic was not a problem.
    But with my LSR32 the room becomes more important. It's not bad, no
    resonances but a little bit to live, as you guessed right.
    Indeed I tend to mix to dry.
    right, only in the back.
    I have no photos at the moment.

    The main problem I have is that there are a lot of tips how to build a
    studio. But there are only few sites how to improve a mediocre room to
    a good one (of course not high end) without complete recontruction.
    Thomas Thiele, Aug 2, 2003
  4. Can't see the right hand wall in this picture, but if there's space on that
    side, turn your mix station around so that the speaker in the corner doesn't
    couple and make the sound different from the other one, unless that one's in
    a corner too. OR, buy bookshelves and fill them with tons of paperbacked
    manuals and novels and such, and place them behind the speakers. If you've
    got those speakers out a meter then you've got the space for 8" shelving
    filled with books. However, if you don't have that many books it's probably
    easier and less expensive to buy Ethan's Mini Traps and hang them behind the
    monitors. But with some yardsailing you can end up with more than enough
    books for very little. The idea is mass. I probably have maybe 400 lbs of
    books which back my JBLs up on stands about 18" out. Seems to work.
    Problem is cleaning day. Dusting tons of books is no fun! <g>

    Also, even though I'm sure you love the LSR32s, if you have a tracking room
    you might want to consider putting them out there for playback monitors and
    find something that's a little more usable for nearfield monitoring. Even
    the LSR28s are almost too big sounding for nearfield use. However, you
    could flip your monitors over. That would allow you to sit and still be
    within most of the sphere.

    And you know, it might even be possible to build up some soffitt to place
    the 32s in. It appears you have a shelf on the left side of the window, but
    with some planning and some pretty dense material between the speakers and
    the walls, I think you might be able to do it. Again, upside down.


    Roger W. Norman
    SirMusic Studio

    Roger W. Norman, Aug 2, 2003
  5. Thomas Thiele

    Dave Martin Guest

    And since it's been months since we've had an Elmore James reference, you
    done good!
    Dave Martin, Aug 2, 2003
  6. Thomas Thiele

    Carey Carlan Guest

    The ideal combination:
    Roger's books and Thomas' curtain to hide the books (and the dust).
    Carey Carlan, Aug 3, 2003
  7. Actually, good curtain like they use for stages would be helpful. Like
    Ethan said, they wouldn't do anything for standing waves, but it can help
    make a little better environment. And if I ever move, the books are staying
    here! <g>


    Roger W. Norman
    SirMusic Studio

    Roger W. Norman, Aug 4, 2003
  8. Thomas Thiele


    May 31, 2010
    Likes Received:
    Prosser, WA
    If you were able to build these speakers into the wall, you would experience even greater bass exaggeration as you would be at half space rather than whole space. The response from the speaker is designed for whole space.

    If you're serious about your business you might think of using a miniDSP device to flatten your response. You can purchase a miniDSP and measurement mic for quite cheap now days.

    In theatre we use heavy velour curtains to help deaden reflected noise, however they don't do especially well for lower frequencies. I have designed theatre curtains that sandwich a thin strip of lead between the two layers of material. The lead strip sewn in and dimensionally is the height of the curtain less the top and bottom seam area, approximately three inches wide and only about 1/32" thick. Of course the hanging method is reinforced to handle the weight. We know that the best way to attenuate sound is via mass. A thin sheet of lead equals five sheets of 5/8" sheetrock in mass. Note: Lead is toxic if inhaled or ingested, so be careful not to do those things while making a curtain as described.
    attrition, Oct 8, 2018
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