Are there Bass Traps for specific Hz ranges?

[flop71]

Hello,

I have used REW to take measurements of my room. From what I am seeing in the spectrograph it appears the there are (at least) two problem Hz areas 52 and 85Hz. Based on watching REW Videos part 1 and 2, Bass traps would be required. For reference I have a room that is 2.6m wide 2.4m high and 5.9m long.

I am based in Europe and from looking at thomman.de there are a number of options Triangular Prism, Recangular and cylindrical.

I know all rooms are different and the treatment required is different for each one. But I am wondering if folks have some recommendations for remediating these troublesome low frequencies.

All réponses are much appreciated.

Thanks
Jonathan

 

[JLM1948]

You need to check tuned resonators. Most common is Helmholtz resonator.They are bulky, but you can tune them to perfection, as long as you have the proper measurement tools.

 

[JJGR]

Check the products from gikacoustics.

 

[JLM1948]

Check the products from gikacoustics.

I don't see any tunable bass traps there...
Check https://www.acoustique-studio.com/ulysses-tuneable-bass-trap-noir-c2x21455692 or https://www.artnovion.com/product-categories/3-bass-trap/products/908-bass-trap-corner-slotted or

Vicoustic Vari Bass Trap (Tunable Helmholtz Resonator)

The Vari Bass by Vicoustic is a tunable Helmholtz resonator that can be used to target the most problematic deep bass frequencies. It can be tuned to frequencies between 50 Hz and 100 Hz, making it perfect for taming room modes that lie below the effective range of most broadband bass traps...

arqen.com

They are not cheap. You can make them at moderate cost, though.

 

[thothsong]

I don't see any tunable bass traps there...

They are tuned, not tunable.

Tuned Membrane Bass Traps Archives - Gik Acoustics

After broadband control is applied and overall decay times are mostly in order, problems can still remain in the lower frequencies. The Scopus Tuned Membrane Bass Trap was specially designed for this need. It can be mounted directly in the corner to help with low end decay or mounted/stacked in...

www.gikacoustics.com

 

[JJGR]

OK

 

[ddude003]

This is a good place to do some research about bass traps and placement... http://arqen.com/bass-traps-101/placement-guide

Maybe you could tell us a little more about your use case... Music room, Home Theatre or Tracking Mixing Mastering Studio... Tube traps and/or Soffit traps can be a good place to start... Room treatment first then EQ...

 

[flop71]

This is a good place to do some research about bass traps and placement...

Maybe you could tell us a little more about your use case... Music room, Home Theatre or Tracking Mixing Mastering Studio... Tube traps and/or Soffit traps can be a good place to start... Room treatment first then EQ...

Sure, I have a home studio, for recording, mixing and mastering. I am looking to tame some of the low end peaks I have some existing panelling that's appears to flatten frequencies above 220 Hz. However I have measured two peak frequencies at 52 and 85Hz. I see similar results with sonor works measurements.

I should add, from plugging into room measurements into the Amroc room calculator, the tool suggested I place some bass traps along my back and wall (which is where my speakers are position).

Attached is the screenshot from the Amroc tool, showing where the frequencies are loudest for the 50-60Hz range.

Cheers
Jonathan

 

[JLM1948]

However I have measured two peak frequencies at 52 and 85Hz. I see similar results with sonor works measurements.

What is the size of your room. Just to check it coincides with fundamental room modes.
52 and 85 Hz suggest 22' x 13' (6.50m x 4m)

 

[flop71]

For reference I have a room that is 2.6m wide 2.4m high and 5.9m long.

I may be interpolating the frequencies as the problem Hz appear to differ slightly (+/- 5Hz) between REW and Soundworks room measurements

Jonathan

 

[ddude003]

You can also use Room Sim in REW... It will allow you to place speakers and listening position, etc... Post a .mdat of your rooms response...

 

[flop71]

Here are the three .mdat files readings I took.

Any pointers are much appreciated.

 

[tjcinnamon]

Those tuned Membrane traps are very fickle for location. They might be most effective a few feet off the wall. They require a lot of experimentation and may end up somewhere not expected.

 

[ddude003]

Everything is location dependent in small room acoustics... Speakers, Listening Position, Absorbers, Traps, Diffusors, other hard and/or soft surfaces... Place bass absorbers where 3 surfaces come together and 2 surfaces next... Range limited soffit traps work well... Your trying to tame below the Schroeder frequency where is room is in control... Your .mdats show that the transition zone and above are pretty good...

Grab yourself a copy of Master Handbook of Acoustics by F. Alton Everest and Ken C. Pohlmann... You may be able to find a previous version .pdf on the web... Not only is there a lot of good information about acoustics, there is also discussion on various style of traps and absorbers with diagrams and calculations on how to build them...

 

[tjcinnamon]

Everything is location dependent in small room acoustics... Speakers, Listening Position, Absorbers, Traps, Diffusors, other hard and/or soft surfaces... Place bass absorbers where 3 surfaces come together and 2 surfaces next... Range limited soffit traps work well... Your trying to tame below the Schroeder frequency where is room is in control... Your .mdats show that the transition zone and above are pretty good...

Grab yourself a copy of Master Handbook of Acoustics by F. Alton Everest and Ken C. Pohlmann... You may be able to find a previous version .pdf on the web...

The room is in control everywhere. I think the purpose of passive treatments are to attempt to help realistically everything above 100Hz unless you have massive absorbers. Below the Schroeder frequency we have the ability to do more EQ'ing whereas above about 300 to 500Hz or so, EQ'ing should be done sparingly, if at all.

 

[ddude003]

You may wish to review the following literature regarding small room acoustics and the Schroeder frequency...

https://www.harman.com/documents/AudioScience_0.pdf

Understanding Digital Room Correction For Audiophiles Article By Mitch Barnett Of Accurate Sound

Understanding Digital Room Correction For Audiophiles Article By Mitch Barnett Of Accurate Sound

www.enjoythemusic.com

What You Might Not Know -- But Really Need to Know -- About Bass

When reading the responses to my recent article "What Audiophiles Are Getting Wrong Abo...

audiophilereview.com

 

[sam_adams]

@flop71, if you have the DIY skills to build your own, you may want to take a look at the the discussion, Tim's Limp Mass Bass Absorbers. Construction details PDF and calculator spreadsheet are at the bottom of the first post.

 

[flop71]

Thanks for all the responses and reading material folks. Much appreciated.

J