[LAU] DIY acoustic absorbers?

[Moshe Werner]

Hi Gabbe,
To my understanding this would have a positive effect. There are actually
some commercial products that are designed "your" way. But
בתאריך 24 ביול 2014 09:21, "Gabriel Nordeborn" <gabbe.nord at gmail.com> כתב:

> Time to revive this old thread... Thank you for all of your messages and
> thoughts! After what feels like ages, I finally have time to start this
> project for real.
>
> A question about low frequency absorption/bass traps:
>
> - One of the best ideas I've seen around for doing DIY bass traps is to
> cut triangles from the rock wool, and then place the triangles in the
> corners, from bottom to roof. I won't be able to do it that way just yet,
> BUT, I wonder whether it would be an idea to just stack rock wool panels on
> top of eachother in the corners, and achieve at least some low end
> frequency absorption?  This wouldn't cover the entire area of the corner,
> but would still make some I guess. My monitors are very small and don't
> produce a lot of low end, and I won't be recording a lot of bassy stuff
> either, so maybe this could suffice as a starting point? See image attached.
>
> Thoughts? thanks again for all the info!
>
>
> On Sun, May 25, 2014 at 10:07 PM, Moshe Werner <moshwe at gmail.com> wrote:
>
>>
>>
>>
>>
>>
>> Hi,
>>
>>>
>>> I recently moved to a new flat, and I've just got my studio properly
>>> setup in one of the rooms.
>>>
>> Congrats! I hope we get a lot of your beautiful music out of this room:)
>>
>>> Problem is, the room is rather horrible acoustically. As this is the
>>> room I've got to play with, I'm going to have to make the best of it
>>> acoustically.
>>>
>>> So, my question is about DIY acoustic absorbers. I'm most likely looking
>>> to build absorbers both for mid/hi-end (I'm thinking the classical rock
>>> wool ones you place spaced out a bit form the walls) and for the lower end,
>>> but I am very much open for suggestions. Here's some specs of my setup:
>>>
>>
>>> - The room is roughly 3.60m wide, 3.40m long and 2.50m high. I think at
>>> least one wall is concrete.
>>>
>> As first step I would consider to mix facing the narrow side of the room
>>
>>  Plus always keep everything nice and symmetric.
>> Also I would recommend to measure the room to see what problems you're
>> dealing with. http://www.roomeqwizard.com/ is available for Linux AFAIK.
>>
>> - My mixing position/monitors is in the middle of the front wall. I sit
>>> about 1.20m out from the wall.
>>>
>> Have you heard about the 38% rule? If not read up on this
>> http://realtraps.com/art_room-setup.htm, also covers early reflection
>> points.
>>
>>
>>
>>> - My monitors are small, a set of Adam A3X (so 3" elements I guess). It
>>> basically gives very low bass response, so I can hear fairly OK down to
>>> about 80hz, rapidly declining down to 60hz where there's nothing left.
>>>
>> Less low energy buildup, but as you mentioned you won't know whats down
>> there so I would recommend you to treat for lower frequencies in case you
>> upgrade your speakers in the future.
>>
>>> - I am not terribly dependent on mixing at high volumes, if that matters.
>>>
>> It matters a bit as there is less energy to be absorbed, but again I
>> would treat properly just in case you want to listen with higher SPL's, so
>> it doesn't totally change the EQ of your mix (anyway it will change with
>> sound pressure level because of equal loudness contour
>> <http://en.wikipedia.org/wiki/Equal-loudness_contour>)
>>
>>>
>>> What I currently have is:
>>> - Two large bookshelves along the wall right behind my mixing position
>>> acting as diffusors. These go almost all the way up to the ceiling, and has
>>> stuff unevenly stacked at different heights/positions in the bookshelf.
>>> They cover 1.60m in the middle of the back wall.
>>>
>> I've got good experience with bookshelves in homestudios, given they
>> aren't to close behind the listening position.
>>
>>>  - I also have a fairly large carpet on the floor in the middle of the
>>> room. It probably doesn't do that much, but maybe it does a little.
>>>
>> It does a little in preventing flutter echo of high frequencies.
>>
>>>
>>> My question then is; are there any effective ways of acoustically
>>> treating this room? Of course, given the topic of the e-mail, I'm very much
>>> willing to do my own DIY solutions, if that's a viable option. What I have
>>> been thinking is doing what I mention above; classical absorber "panels",
>>> and bass traps.
>>>
>> I would treat the corners and early reflection points first.
>> In a homestudio of a friend we filled the corners with rockwool made a
>> wooden frame and covered them with fabric.
>> Early reflection points can be treated with 10-15cm thick "classical
>> absorber panels".
>> For our live room we've done something else, we made wooden slat covered
>> frames and filled the cavity with rockwool .
>> I like what it does to the room as it doesn't make it dead but tames the
>> response quite nicely.
>>
>>
>>> But, before I start anything, I'd very much like input from people who
>>> actually know what they're talking about (I'm looking at you on this list
>>> ;) ). So, does anyone have thoughts/suggestions for me? Any recommended way
>>> of doing this?
>>>
>>> Thank you very much for any help and any replies!
>>>
>> Best of luck!
>> Moshe
>>
>>
>>
>
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