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Wide bass dip in a small room
Old 3 weeks ago
Gear Head
Wide bass dip in a small room

Hi all.

I think I need a bit support to improve my room acoustics.

The room measures 3.7m (L) x 3.2m (W) x 2.7m (H)

The walls are covered with a sheetrock and and 50mm Rockwool under it.
Ceilling is a "sandwich" of MDF and rockwool too.
There is a big doorway on the back wall 2m (W) x 2,3m (H) that leads to another completely untreated room with brick walls and higher celling (About 5 meters high).

Right now the monitors (JBL LSR308) are placed on quite high stands (1.4m)
Distance from center of each woofer to front wall is about 70cm and about 1m to side walls.

The room sounds fairly dead, but biger problem is a wide dip between 60-100 Hz.
Looks like it's caused by SBIR. Which is very typical for such a small studios.

So now I'm going to find a better speakers position. Seems like getting a lower stands (100-120cm) and moving monitors as close as possible to front wall should work (about 40-50 cm from wall to woofer, and about 80 cm from side walls).
The listening position is going be the same as now - 1.40m from front wall.

The next possible steps: putting 50x60x270cm superchunks to all wall-to-wall corners, mounting a cloud or even tuned trap on ceiling to reduce 120Hz peak and attaching diffusors in E.R. points on side walls.
What do you think?
Attached Thumbnails
Wide bass dip in a small room-l-r.jpg  
Old 3 weeks ago
Lives for gear
Jason Foi's Avatar

Speaker height should be based on acoustical axis of the speakers. This should be ear height. Moving speakers up to front wall is a good idea. You should consider making your super chunks at least 60cm across but up to 90cm is better. A large cloud and all first reflection points are a must. Use etc in rew to determine reflections.
Old 3 weeks ago
Gear Head
According to REW room simulation even moving monitors to the front wall and lowering them down (since the current position - a bit too high) will give a significant improvement of low end response.
Especially concidering the second room as a kinda bass trap.
Haven't try it yet though.
Adding a sub is a good idea too. Thinking about it...
Attached Thumbnails
Wide bass dip in a small room-rew-room-sim.jpg  
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