New room with weird shape - setup and acoustical treatment?

Discussion in 'Pro Audio' started by Boris Lau, Mar 24, 2007.

  1. Boris Lau

    Boris Lau Guest

    Hi all,

    I'm moving into a new apartment, with one room dedicated for recording
    and mixing. Although it's just for fun and I can't spend a lot of money
    an it, I'd like to optimize the sound in that room as good as I can. I'm
    recording mostly myself, a lot of DI, plus some percussions and vocals.

    The walls, ceiling and the floor are not shared with any neighbours'
    apartment, and it's fairly quiet, so noise isolation is not so much of
    an issue. The room has kind of a weird shape, please see my drawing:
    It's square, with the ceiling rising from corner (top-right) up to the
    dashed line, then it's flat (bottom-left). So the slope of the ceiling
    is turned by 45° with respect to the walls.

    The floor is covered with a thin carpet that I cannot remove, the
    ceiling is made from wood as you can see in this picture, which shows
    one corner (top-right) of the room looking up:

    The walls are plastered washed-out concrete. I know all of this is
    probably far from optimal, but it's what I got.

    1st question: Nearfield speaker placement (Genelec 8030A, stereo).
    Should I align my desk with the wall (left setup) or with the ceiling
    (right setup)? Any other suggestions for placement? What distance from
    the wall is reasonable?

    2nd question: Given your recommended speaker placement, what acoustical
    treatment might be necessary? For the left one I thought of corner traps
    for the back, plus some absorbers on the sides and the front. How would
    that translate to the right setup, if it makes sense at all? Thinking of
    my budget I'll probably go for DIY solutions. Can I do without an
    absorber above my desk, because of the sloped ceiling?

    I know that trying and listening is necessary, and I'll do that. Before
    I start to build absorbers, I'll do some measurements as well. But it
    would be nice to have a point to start, to limit the space of
    possibilities. So I'd be happy for any advice.

    Thanks a lot,

    Boris Lau, Mar 24, 2007
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  2. Boris Lau

    Boris Lau Guest

    Boris Lau, Mar 24, 2007
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  3. Boris Lau

    Boris Lau Guest

    Thanks Ethan, that's a very nice site. So facing a corner is bad because
    of the wall-to-wall junction. Facing the wall makes the setup
    unsymmetric in that room, since the ceiling is higher at the left side
    of the room than on the right, as pointed out in my original post. Any
    thoughts regarding this trade-off?

    Boris Lau, Mar 24, 2007
  4. Actually, picture 2. seems pretty right to me. You'd get some linear bounces
    which diminish in bass as the ceiling goes down. That's what I would do. And
    definitely kill the corners with strong absorption. You could also make some
    pieces of cloth (tweed) on a wood rectangle (I don't quite know how to
    describe it otherwise), like a painter would before painting. And put those
    in a more linear pattern under the ceiling to lessen the fall.

    It seems like a good idea to put some stronger absorbers on the wall from
    the floor to about 1m high, since there is where the bass is going to bounce
    off the floor and get on your nerves. :)
    Also, a nice tapison on the floor, moquette, as the italian call it, with a
    at least 2cm thick layer of hard sponge under it (they sell it in stores

    Maybe (make that probably) some will disagree with me, and maybe I've even
    wrote something stupid. But on a budget, that's WHAT I WOULD do, and that's
    exactly what I will be doing in a week or so. :)

    FINNALLY!!!! :)
    Marcello Mastroiani, Mar 24, 2007
  5. Boris Lau

    Boris Lau Guest

    Thanks for your reply. I tried both, and I have to admit that I took the
    other route, considering the clearer better stereo image that I thought
    I had, and space effiency in that small room.

    Now to room treatment, I'm thinking about building some broadband
    absorbers. I've written a post in the acoustics forum at studiotips:

    If anyone of you finds it more appropriate to discuss it here in the
    group as well, I'd be happy to put it in here as well (in compressed form).

    Thanks for any help

    Boris Lau, Apr 5, 2007
  6. Boris Lau

    duvall.mark Guest

    Boris, that's an interesting problem you've got to deal with. In
    your room drawing the right hand drawing with the offset desk
    arrangement would be preferable with some slight modifications. It's
    an acoustical fact that low end frequencies are harder to manage and
    that they build up in the corners of the room (also where the ceiling
    meets the walls). I would start there and then look at your high end
    frequency troubles.

    If it's possible to fill up the corner with low frequency absorbers to
    kind of round out the room both literally and figuratively. especially
    the corner the would be directly in front of the desk. try not to
    have the listening position be in the direct center of the room.
    That's where the most standing waves tend to build up. helped us out a to Ben...
    duvall.mark, Apr 6, 2007
  7. Boris Lau

    Boris Lau Guest

    What do you mean? Filling up the corner instead of using the diagonal

    Boris Lau, Apr 7, 2007
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