27th September 2012
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#1 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter | could you help me ?
Hi guys.
After a lot of tests and try, I'm still unhappy with my results.
I've got a 5.32m/4.32m mixing room.
The ceiling is 2.35m high.
My listenning position is approximatly at 38% of the room, I've put bass traps on the two front corners, superchunks on the two rear corners, aborbers at all first reflections points ( side walls, ceiling, front and rear walls), and I've got two Hofa bass traps between my monitors.
After testing a lot of different positions of monitors and listennig position here is my best results.
The stereo image is clear and detailled but I still got a lot of lows that I don't like.
Did I make something wrong ?
Do you have some advice ?
Thanks for your attention,
Alex
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27th September 2012
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#2 | | Lives for gear
Joined: Jan 2004 Location: Highlands of Scotland
Posts: 2,251
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What sort of monitors are you using?
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27th September 2012
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#3 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter |
I'm using dynaudio BM5A
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27th September 2012
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#4 | | Gear addict
Joined: Sep 2012 Location: Atlanta, GA & Bradford, UK
Posts: 358
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Hey Alex,
Your room response actually looks pretty good for the amount of trapping you have. There are still some peaks and nulls, but overall you seem to be in a +/-10dB or so ballpark which is a really good start.
Is the bass really that much quieter below 100 Hz? I haven't seen peaks that are that wide before, so I'm not sure if the microphone was placed correctly. How far are your speakers to their nearest boundaries? Also, have you tried any trapping behind, to the side, or on top of the monitors? Not first reflection panels, but directly between the monitors and their boundaries?
Also, what material and sizes are your traps?
Have you thought about tuned traps at all? They can be tricky to build correctly, but our Scopus trap has shown some really impressive results, especially in rooms already treated with broadband traps.
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27th September 2012
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#5 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter |
My monitors are at 1.05m of the front wall and 1.72m of the side walls.
My bass trap are 1.35m/0.6m.
They are 20cm deep with a 10cm air gap.
They are made with 35kg/m rockwooll.
The mic is standing at my mixing position and, when I listen to my reference mixes, I can clearly ear that big bass peaks.
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27th September 2012
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#6 | | Lives for gear
Joined: Jan 2004 Location: Highlands of Scotland
Posts: 2,251
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Firstly, the dimensions of the room seem OK, though there are several possible problems at 150Hz - 200Hz.
Take a mic, link it to a peak meter and generate a tone at 150Hz and move the mic around the room until you find the spots where the tone is at its' loudest. It will almost certainly be in the corners. That is where you put up bass traps large enough to swallow the problem.
Also, the speakers may be part of the problem, as they are bass reflex and may ring at or around those frequencies. I could not find any waterfall plots for them, but I would block up the reflex ports and add a sub. Small speakers, trying to do the job of large speakers always create problems. Better to X-over at 100Hz (Dynaudio recommend 80Hz, but they fall away sharply below 100) and add a sub or two. If you do this, remember to block-up the reflex openings.
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27th September 2012
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#7 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter |
do you think that the 72Hz resonnance seen on the waterfall could be a cause of the 150 peak ?
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27th September 2012
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#8 | | Lives for gear
Joined: Jan 2004 Location: Highlands of Scotland
Posts: 2,251
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Flippant answer - No! I think the 150Hz peak is the cause of the 150Hz peak! But they (and similar resonances at functions of 75) are obviously related.
Seriously, I cannot give you an accurate answer to anything, as one has to be there and test things out. As I stated, find a problem frequency and then find the most problematic part of the room and put a bass trap right there.
You can also try to move stuff around, especially the speakers themselves.
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27th September 2012
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#9 | | Gear Guru
Joined: Jul 2005 Location: Atlanta, GA
Posts: 14,391
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You are getting some good answers above but just to add the 150 peak could be coming off the desk. I have seen that before.
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27th September 2012
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#10 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter |
I have done some test moving the mic everywhere in the room.
I noticed that, like you said, this !!@&!?! peak is big in each wall-to-ceiling angles.
To build my room I had to break a wall between two rooms to make one bigger.
So there is some piece of this wall staying there ( I don't know how to explain it well in english, sorry). You can see it in the plan.
Does it mean that I will have to bass trap all these angles to resolve my problem ?
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27th September 2012
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#11 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter |
here is the plan
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27th September 2012
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#12 | | Gear Guru
Joined: Jul 2005 Location: Atlanta, GA
Posts: 14,391
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Does it mean that I will have to bass trap all these angles to resolve my problem ?
| You could put bass traps there but that area is really is not considered a corner. A corner is where boundaries meet. Watch the following video on how bass traps work and about low end frequencies. Video: Bass Traps and Understanding Low Frequencies | |
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28th September 2012
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#13 | | Gear interested
Joined: Jun 2012
Posts: 11
Thread Starter |
Hi guys.
Let me know if I understand the theory.
The bass frequency are increased in the corners and are rejected in the room.
After testing I saw that, in all my corners and angles I have a lot of 150/200 Hz.
So is the reflections of all these corners that I hear at my listenning position ?
This 150/200 peak is big at my position and at other points of the room but not everywhere.
So Do I have to treat all these angles to reduce this peak or only the corners?
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