Acoustic Fields - All Forums Simple:Press Version 6.6.2 EJR on Advice please - Treatment / Setup Acoustic Treatment Hello,

Firstly thanks Dennis for all the knowledge you have shared, it has already been a greatly appreciated redirection.

I have a newly leased house and I am here to ask for advice on what kind of diffuser
/ absorption
treatment to use, and where to use it.

Room is to be used as a music / mastering room with minimal need for recording live acoustics at this moment, mostly recording direct signals from electric instruments.

I am allowed to hang treatment on walls. Roof treatment not practical for my situation.

Details of the room :

Size of the room : W = 3.36m (11ft) H = 2.40m (8ft approx.) L = 4.55m (15ft)
Small room I'm know, however the room can be used how I want, within the bounds of my lease agreement.
I currently have the speakers (temporarily) set on my desk at the front 1/3 line (1.5m / 5ft)
Listening position near the rear 1/3 line.

Large front window - willing to keep closed permanently and add portable diffuser
and/or absorption
treatment, currently using two thick camping mattresses and double layer curtains as a temporary "better than nothing" approach.

Door in front left corner.

Hardwood floors on a raised foundation.

Open rear double doorway which leaves approx 0.90m of rear wall on both left and right side. 0.30m between doorway and ceiling.

Two small wall ventilations near ceiling on both ends of one side wall.

Textured ceiling with plaster or render. (not completely flat)

Rug below listening position.

Speaker specifications:

I have a pair of PSI Audio A-17M, 2-way Speakers with 7" Drivers
Which I plan to use on individual stands at approx. 1.2m (4ft)

Power RMS: 80 + 40 W
Program Power: 120 W
0.25 s PSI-M SPL@1m: 99 dB
Short Term max SPL@1m: 104 dB
Peak max SPL@1m: 114 dB
Signal to Noise Ratio: 95 dBA
Response at -6dB: 44 - 23000 Hz
Phase tolerances: ±45° (180Hz - 20kHz)
Dispersion: 90° x 90° (H x V)
System: 2 Way(s)
Crossover frequency: 3.6 kHz
Woofer's dim. Ext. / Diaph.: Ø175 mm / Ø130 mm
Tweeter's dim. Ext. / Diaph.: Ø100 mm / Ø25 mm

Dimensions W x H x D mm: 200 x 320 x 230

So with all that, with my focus being on side / front / rear wall treatment, what kind of Acoustic Fields' designs should I look into building, and where would be the best position to mount them or place them.

I am located in Australia so buying finished products from Acoustic Fields isn't a cost effective option considering how much freight would cost to ship so many heavy units.
(Unless you have distributors in Aus)

Good luck with this edition of small room challenges !

Advice would be greatly appreciated,

Kind regards,

Mon, 03 May 2021 22:09:20 -0700
Dennis Foley on Floor isolation Sound Barrier Technology What is the amplitude or strength of each frequency?

Mon, 03 May 2021 05:42:28 -0700
HDGray on Floor isolation Sound Barrier Technology

inragespace said
probably everything from 20hz to like 2khz ...can't you post pics here ? :) really wanted to know how much of the waveform if not all gets isolated with a floor like im making ...  

You can simply run an RTA and write down the highest peaks then post them here.

You don't have to list every single one

Just the highest peaks within a range , such as 30 to 125Hz
125 to 500 hrz
500hz to 1K, 1K to 5K and so on.

Or simply email screen shots to Dennis

Mon, 03 May 2021 04:21:49 -0700
Dennis Foley on Floor isolation Sound Barrier Technology You are guessing and guessing with noise is not good. What are the associated amplitudes or strengths?

Sun, 02 May 2021 15:48:39 -0700
inragespace on Floor isolation Sound Barrier Technology probably everything from 20hz to like 2khz ...can't you post pics here ? :) really wanted to know how much of the waveform if not all gets isolated with a floor like im making ...

Sun, 02 May 2021 13:50:07 -0700
Dennis Foley on BDA kit proposed size not practical Acoustic Treatment Yes, the depth dimensions can not be changed. You can build them any width or height your room requires.

Sun, 02 May 2021 09:08:27 -0700
Dennis Foley on Building a Listening Space: Step1 Discussions We can assist you with both noise and treatment. Contact us at Place the word Design in the subject line.

Sun, 02 May 2021 09:06:13 -0700
HDGray on Floor isolation Sound Barrier Technology What Dennis said.
You are tossing darts blindfolded.

You don't know for sure where the sound is coming from.

You are not really sure what frequencies are really the problem.

You said you can hear voices.
Speech falls with in midrange frequencies, but which ones?

You.mentioned low frequencies.
You can't hear stereo separation below 150 and the lower you go the less you can hear, but you can feel it, audible is very different from a 60 Hz wave rattling your bones.

Download a free real-time analyzer app .

When your neighbour's are especially chatty crank up your input gain and move the Mic around capturing screen shots of what you discover.

While not the most accurate approach, this will give you some idea of what frequencies you are up against, & help you better focus your attention in the right direction and the correct solution to your problem.

Acoustics is science.
Science doesn't work without data.
Scientifically accurate solutions are not solutions until some one who who understands the data confirms the data matches the suggested solution.

Listen to Dennis, you will be glad you did.

Sun, 02 May 2021 02:56:01 -0700
inragespace on Floor isolation Sound Barrier Technology well ill be making it. will have to be made with mineral wool and OSB board.doing it 6cm wool and 1,5mm OSB boards. with some cork between the pinewoods and the already existing floor of the idea is that even if it wont block the sound completly it will be enugh to break the waveforms from the speakers and stop the room modes at least ?

room is 12m2

speakers are kinda big 300W

panels 15 cm sidewalls and ceilling.

Sat, 01 May 2021 16:25:38 -0700
HDGray on BDA kit proposed size not practical Acoustic Treatment

Dennis Foley said
F, You can build any width or height you desire. You can not change the depth. Foam is 100.00 USD / BDA plus shipping. If you are placing foam
on the face which is recommended, you need 2 foam
/ unit.  

Dennis. This is the kind of information I was looking for.

So this means the real critical dimensions are the depth and spacing of the internal baffles & pegboard carbon absorber

So I could build cabinets that are 24 inches tall to 8 feet tall if I want?

beyond saving on material waste this will solve all kinds of problems for me involving my back wall which has limited width but plenty of elevation.

Sat, 01 May 2021 15:48:41 -0700
SteveJag on Building a Listening Space: Step1 Discussions Hi All.

I've never had a space for my music before but I've now got that opportunity. So whatever happens I'm ahead of the game. I have a blank sheet of paper on 'what to do' and a blank piece of ground to do it on but also plenty of constraints.

1. I have an initial budget. I have no idea yet, how far it can take me. I lack the building skills but I can do the grunt work.

2. It's a music room.
It's where I will practice and record, mix and listen to my records. Practice and recording have no particular requirements. The recording is all DI other than vocals.
It will be sound-resistant as we have neighbours I will not upset.

3. It's an Office.
There will be a partitioned section where I'll be earning my keep. This will double up as a vocal booth
if needed.

4. It's a summer entertainments room
There will be a large glassed frontage opening out onto the garden where friends and neighbours can grab a beer, talk a load of nonsense and enjoy some music, live or otherwise.


I'm aware of the difficulties that the glass will present to listening and sound-resistance. I'll probably need a double frontage to assist with sound-resistance and I'll need to do something on the inside to reduce the effect of the glass on the listening experience. Moveable screens of some type maybe?

With the conflicts in requirements and eventual cash constraints, I know I will have to compromise. Whatever happens, it's going to be educational.


The first question then, is on the general construction approach to take. i.e. The things I'll need to discuss with the builder to get things moving.

I assume a suitable concrete base. But what should I use for walls and roof. High density block (0.5kg/1.1lb each)? Concrete bricks(2.2kg/5lb each)? Timber? I'm thinking a vaulted roof rather than flat one and high density block (for better wall mass than timber and less labour than concrete brick). Timber cladding for aesthetics.

Any thoughts or comments are welcome.

Sat, 01 May 2021 09:59:44 -0700
Dennis Foley on Filling speaker stands with activated carbon? Discussions Carbon is a sound absorption
technology. Lead and sand are barrier material types. You must stay with sound absorption
inside any diaphragmatic absorber

Fri, 30 Apr 2021 07:53:25 -0700
johnjokeefejr on Filling speaker stands with activated carbon? Discussions Hi,

What is the benefit of adding activated carbon inside of a speaker stand versus lead balls or kiln dried sand?

What would be the cost to fill 4 cubic feet using your activated carbon?


Thu, 29 Apr 2021 07:50:21 -0700
Dennis Foley on Floor isolation Sound Barrier Technology First we need to quantify and qualify the noise issue. We must measure the frequency and amplitude of the noise and then design the barrier material and construction methodology to fit the noise. Guessing with noise is never a good idea.

Wed, 28 Apr 2021 08:51:05 -0700
inragespace on Floor isolation Sound Barrier Technology Hello! First post here trying to get a clear answer on this.

I am in a L = 4,12m * W = 2,92m * H = 2,51m room. It's an apartment building. I haven't done any isolation at all. Have 15 cm Panels with mineral Wool all around that covers like 80% of the side walls and ceilling...

Bought a pair of KRK 10s G4 and these beasts tremble the entire building.

The problem is the floor mostly, or so i believe. The floor is already sort of isolated , it is XPS with parké over concrete i believe( maybe no XPS ). the walls are not great i think just bricks. inside the studio i ear peoples voices and this is why i make my post. I'm not sure it comes mostly from the walls or the floor..was thinking on doing a nice floor with studs and 10cm Rockwooll over XPS with OBS on top..will this isolate enough the sound and also improve acoustics inside...meaning, will the floor just reflect bass energies anyway? i got some dips on the 60-80 hz range and im sure its the floor...wouldn't like to spend money and then have almost no isolation and same acoustic response ... any advice? thanks!

If you need any more info please do tell...

Wed, 28 Apr 2021 04:55:36 -0700