How do these look?

[SCDBM]

I measured my room in REW with an EMC8000 mic.
I've got a serious gap between the 100 <> 200hz area and no clue how to solve it.

both picture and drawing of my room are attached, dimensions are

7.7m long
3.52m wide
2.6m high (in the middle)

I've got auralex panels on the front (3) / rear (2) and side (3) walls and also 6 Basstraps made of Rockwool 201 fiber (each trap 1m * 60cm * 20cm) i've got 2 traps stacked behind the speakers at the front and single traps in each opposite corner.

on top of that i've got a floating floor, stuffed with Rockwool 201 as well and then 2 layers of plywood, 10cms in total, all walls are concrete/drywall

what kind of issues do i have in my room? overall i am quite happy with the respons, but i need to get my 100<>200hz straight and would probably want a louder bass respons, bass is tight, but lacks oommphhh

Please help, as this is as far as my knowledge goes, happy to do anything in order to get the best repons possible for this room.

[SCDBM]

Ok, to be a bit more precise, do i have a problem @ 45hz and 120hz?
and how can i boost those frequencies?
I've got rockwool basstraps in the corners (12 slabs thick) but though they sooth overall, they don't seem to be able to solve this issue.

When i walk through the room, bass pressure is quite even in de room, are these frequencies cancelations? or do i already have too much absorbtion?

I really need some perspective in order to explore further.

Measurements are REW STEREO measurements taken from listening mic aimed towards speakers horizontal dead center (so like aiming a gun exactly between the speakers) should i also measure speakers induvidually?

[SCDBM]

moved speakers and basstraps around also measured with and without subwoofer. i think below graphs look better?

but still what can i do about the nearly -10db gap between 100-200hz?

[Ethan Winer]

Without knowing anything about your room or even its size, it's impossible to even guess at advice. I can tell you that 1/3 octave averaging on those frequency response graphs hides most of the detail. More here:

Room Measuring Primer

There's also another great primer Dan FitzGerald wrote in a sticky thread in this forum.

--Ethan

________________
The Acoustic Treatment Experts

[SCDBM]

my room is 7.7m long and has a slanted roof on each side (front/back) ending into a rear / front wall of 60cm high and 3.5m width
listening position is @ 7.7 * .38 = 2.90m


so a bit like this



/\
| |


speakers are B&W 803s

[Hannes_F]

Hi there,

do you guys never read any thread with similar topic?

Yes you have a lot of problems here.

Read this thread:

Big Null around 80Hz and other problems - Help

[SCDBM]

So this is my room

length 7.7m
width 3.52m

got rockwool 201 DYI massive corner cube traps of 100cm * 60cm * 60cm in each front corner already (is the back corner better? as that's probably the first reflection?). also got a floating floor filled with 201 and 2 layers plywood on decoupled 6-4's (10cm's high in total)

seating position is @ 38% of front, not really sure what other info i need to deliver? I've got no clue whether my gap comes from room size/cancelation, or anything else

[Ethan Winer]

Originally Posted by SCDBM

got rockwool 201 DYI massive corner cube traps of 100cm * 60cm * 60cm in each front corner already

Only two traps? You need much more! And not just on the wall-wall corners, but also where the walls meet the floor and ceiling. If you add ten times more trapping that won't be too much. If you ever record in that room, you'll also benefit from more absorption under the angled peak.

is the back corner better? as that's probably the first reflection?

All corners are viable. But those are not usually reflection points. More here:

How to set up a room
Early Reflections

--Ethan

[SCDBM]

Thanks Ethan! so starting with double the amount of traps and find a solution for the corner in the roof.

can one say something about my 100hz <> 200hz issue? is this cancelation? will these frequencies lift up as well in REW when adding more trapping?

[Ethan Winer]

Yes, adding more bass traps improves your LF response and ringing.

--Ethan

[SCDBM]

great

So.... now i have 3 options

rockwool 201 and just make 2 giant basstraps from left to right @ 60cms high and 60cms deep which means wall2wall 3.50m wide, directly on the front and rear wall.

Or

take denser plates like 211 or 221 and have like 30cms with a 30cm air gap behind?

What would be the better solution here?

can do this on the front and on the back, and just mount a nice shelve on top (or make it a big rack) and put cloth in front

or just don't bother and go with GIK?

[Glenn Kuras]

Originally Posted by SCDBM

great

So.... now i have 3 options

rockwool 201 and just make 2 giant basstraps from left to right @ 60cms high and 60cms deep which means wall2wall 3.50m wide, directly on the front and rear wall.

Or

take denser plates like 211 or 221 and have like 30cms with a 30cm air gap behind?

What would be the better solution here?

can do this on the front and on the back, and just mount a nice shelve on top (or make it a big rack) and put cloth in front

or just don't bother and go with GIK?

Building is always cheaper (just like anything in life) but if you are looking for a more pro look and pro advise then commercial products are the way to go.

Glenn

[SCDBM]

I don't think it's that much more expensive, had a great quote from GIK, based upon my room drawing. I mean if you take plates, wood, cloth & labour you might save yourself another 300$ by DYI, but then again getting stuff ready to use on a pallet has it's charm as well :D and as mentioned professional look.

So GIK advised me the following:
1 pair Tri rear bottom
2 pair 244 side walls near speakers and celing
1 set 242 in front of desk between speakers
All in Camira EJ104

Would u concur with that based upon my info above? or would u do things different? my main concern is to lift my 100,200hz respons and looking at my waterfall my room is already quite "dead"

[SCDBM]

When Ethan said it needs a lof of trapping, no shit sherlock, it needs A LOT of trapping, I've built 4 monster cornertraps of 1m * 60cm * 60cm
2 new basstraps 60cm * 20cm * 100cm
which are all Rockwool 211 based together with laminate underlayment (that green filt/karton type stuff) enclosures)

and the good news, the gap between 100 <> 200hz is narrowing, no longer as steep, no longer as deep. I shaved off roughly 40% of the cancellations.

My real upside is hopefully going to be in the GIK order i placed the other week 3 242 panels for ceiling corner and 2 monstertraps for closely behind the B&W's.

The rest of the upside needs to come from trap and speaker placement.
no more space is the room left