125hz-134hz Null - Help please!
Posted: Fri Feb 19, 2021 2:54 pm
Hey everyone,
It's been awhile since I've posted in here, but I moved into a new place and am looking for some guidance on room treatment and/or speaker placement.
Room Dimensions:
L: 17' / 518.2cm
W: 13.75' / 419.1cm
H: 8' / 243.8cm
amroc: https://amcoustics.com/tools/amroc?l=51 ... .8&r60=0.2
Treatment: I have yet to fully build out the front and back wall, I'd like to figure out a plan of action so I don't build something that's useless or makes things worse.
Front: 24" superchunks of RW safe n sound in corners, 9" RW safe n sound 4'x8' with 1/8' hardboard facing listening position.
Sides: 6" OC703 2'x8', QRD-11 diffuser, 4" OC703 2'x8'
Back: 12" deep membranes in corners (2" OC703 > 2"RW60 > 1.5" Air > 4" OC703 > 2.5" Air > Rigid Back. Sealed.), QRD-11 diffuser, 12" deep membrane (0.5lb MLV > 4" Air > 4" RW60 > 4" Air > Rigid Back. Sealed.)
Ceiling: 6" OC703 4'x8' cloud between speakers and listening position, 6" OC703 2'x6' 3/4 from front wall.
Speaker Placement: Speakers are Barefoot MM27 with -2db on the subs.
I've tried a few placements
#1. Speakers against the front wall - 40hz and below spikes, 125hz null still exists
#2. Speakers 30" from front wall - 40hz and below is more balanced, 125hz null still exists
#3. Speakers 48" from front wall - all bass is a mess, tons of nulls, 125 null still exists
#4. Speakers 16" from front wall - 40hz and below is balanced, 125hz null improved about 5db.
I tried lowering speaker height from 48" to 45" to see if it was ceiling/floor bounce.
I also tried putting treatment in between the listening position and the speaker to see if it was floor bounce, it improved the null by about 3db.
I ran a 125hz sine wave and went around the room with an SPL meter, there are no reasonable listening areas where it's improved, only spikes in the modal areas such as side walls and 2-side corners.
Questions:
- Is it a collection of room modes causing my issue?
- What treatment will fix the 125hz null?
- Any other general recommendations on improving my room?
Budget & Goal
Everything I've built thus far is extremely modular, I'm open to moving anything around, adding/changing/removing treatment I've already built.
I'm open to building hangers, membranes, slat resonators, VPRs, and more permanent structures as well.
Budget $2-$3k.
Goal: +/- 5db
Link to .mdat file: https://www.dropbox.com/s/5mch5gutii5t2 ... .mdat?dl=0
Let me know what you guys think and what questions you have.
Thank you!
It's been awhile since I've posted in here, but I moved into a new place and am looking for some guidance on room treatment and/or speaker placement.
Room Dimensions:
L: 17' / 518.2cm
W: 13.75' / 419.1cm
H: 8' / 243.8cm
amroc: https://amcoustics.com/tools/amroc?l=51 ... .8&r60=0.2
Treatment: I have yet to fully build out the front and back wall, I'd like to figure out a plan of action so I don't build something that's useless or makes things worse.
Front: 24" superchunks of RW safe n sound in corners, 9" RW safe n sound 4'x8' with 1/8' hardboard facing listening position.
Sides: 6" OC703 2'x8', QRD-11 diffuser, 4" OC703 2'x8'
Back: 12" deep membranes in corners (2" OC703 > 2"RW60 > 1.5" Air > 4" OC703 > 2.5" Air > Rigid Back. Sealed.), QRD-11 diffuser, 12" deep membrane (0.5lb MLV > 4" Air > 4" RW60 > 4" Air > Rigid Back. Sealed.)
Ceiling: 6" OC703 4'x8' cloud between speakers and listening position, 6" OC703 2'x6' 3/4 from front wall.
Speaker Placement: Speakers are Barefoot MM27 with -2db on the subs.
I've tried a few placements
#1. Speakers against the front wall - 40hz and below spikes, 125hz null still exists
#2. Speakers 30" from front wall - 40hz and below is more balanced, 125hz null still exists
#3. Speakers 48" from front wall - all bass is a mess, tons of nulls, 125 null still exists
#4. Speakers 16" from front wall - 40hz and below is balanced, 125hz null improved about 5db.
I tried lowering speaker height from 48" to 45" to see if it was ceiling/floor bounce.
I also tried putting treatment in between the listening position and the speaker to see if it was floor bounce, it improved the null by about 3db.
I ran a 125hz sine wave and went around the room with an SPL meter, there are no reasonable listening areas where it's improved, only spikes in the modal areas such as side walls and 2-side corners.
Questions:
- Is it a collection of room modes causing my issue?
- What treatment will fix the 125hz null?
- Any other general recommendations on improving my room?
Budget & Goal
Everything I've built thus far is extremely modular, I'm open to moving anything around, adding/changing/removing treatment I've already built.
I'm open to building hangers, membranes, slat resonators, VPRs, and more permanent structures as well.
Budget $2-$3k.
Goal: +/- 5db
Link to .mdat file: https://www.dropbox.com/s/5mch5gutii5t2 ... .mdat?dl=0
Let me know what you guys think and what questions you have.
Thank you!