Is room acoustics grounded in science based facts, or a mishmash of hypotheses and 2nd and 3rd generation myths? I put it to the test:- My room is 18 feet wide, 21 feet long and 8 feet high. It is P-shaped with an 7 feet wide, 12 feet long and 8 feet high kitchen forming the leg of the P. The flooring is wood clad concrete on a block and bean base. The ceiling is solid concrete with single skin plasterboard walls. 1 long wall is all window from above 3 feet. So, as any acoustician would tell you it’s an acoustic horror story. All that having been said, in my far from ideal, untreated room, the audio reproduction from my premium hi-fi, is superb, as good as I’ve heard, anywhere. The stuff of life that shares space in my room with my hi-fi, rugs, curtains, sofas, cushions, family and pets is undoubtedly partly responsible for taming the room. Nevertheless, with so many KZbin videos ramming the importance of room treatment down my throat, I decided to investigate. I commissioned 3 acousticians from 3 different companies to quote me for room treatment. The quotes varied from 1850€ to 2700€ to 4200€. All 3 acousticians offered very different solutions. But there was some common ground. So I took note of that common ground and using products purchased from Amazon, I did the work myself. Total cost just under 1000€ not including my labour. Then I sat back with my favourite playlist and attentively listened for a considerable length of time. Yes, my room’s ambience was different. But I didn’t consider that altered ambience to represent superior audio reproduction. I experimented with swapping absorption panels for diffusion panels. Distancing bass traps further from the corners, Etc. but I could not create an ambience which I felt improved upon the original audio reproduction of my hi-fi in my untreated room. I guess personal taste is a major factor here. Before you all start barking at me, for using professional acousticians and steeling their ideas, I did pay each of them a consultation fee. So I urge all vulnerable audiophiles not to suffer room anxiety. But if there is anyone out there contemplating taking the same approach as me, I have an attic full of acoustic panels and bass traps you’re welcome to come and collect.

When making an isolation booth for a drummer, for house of worship, would you recommend plexi or glass?

Yoy need to watch the REL videos

Asbestos is a red herring , Stay on point and discuss wool

I have found there are valid reasons for corner traps. The main one is that bass frequencies gather in the corners because they spread from the source more easily and widely and the main speakers are nearest to the front corners. When I put some traps in the two front corners I found the freq response smoothed out for panned images all across the front.

do you think making use of rug carpet on part of the walls will handle echoes in a large room like church building?

Forget the thousands of dollars in gear. Thousands in room treatment can make a mediocre system sound kingly! I spent under $2000 on materials, built my own treatment, and couldn’t be happier!

How about a giant screen TV? If the front baffles of my speakers are 2+ feet in front of the TV surface is that OK?

If my speakers have a 10 inch driver, is it ok to buy a 10 inch subwoofer, or is it a must to go with 12? What if I went with a smaller subwoofer like 8 inch together with 10 inch speakers?

What size of subwoofer do you recommend?

Ive asked this question on so many videos and never had a response - how is pulling speakers into the room better than pushing them right against the back wall? I see so many recommendations that put the speakers right in the 3 - 5' zone where the 1/4 wavelength to the back wall is going to reflect to destroy the 50 - 100 Hz region, whereas the speaker against the wall will raise that to a far more treatable 250 - 300 Hz ? Obviously you're going to get a 1/2 space bass boost, but a simple shelving eq will sort that ?

Thank you, this hadn’t crossed my mind yet

what do you recommend for minimize noise in a restaurant that have joist and space in between, panels or something in between the joist, is low budget project!!

Good education

those Eames chairs shure gone popular.

What is your opinon (neutral unbiased opinion) about Primacoustic Maxtrap?

Excellent presentation, thank you ! Bill P.

I put my already tall floor standing speakers on 20” risers and the difference was insane. My equipment rack is only 12” off the floor, and the midrange driver is almost 3’ from the floor, 24” of clearance from equipment to midrange. Key advice

Those Audio Note speakers are very specifically designed to work in corners

Do activated carbon granules' performance degrade over time? Do volatile compounds, and airborne pollutants get trapped in the granules after months/years?

all well and good but I do like a bit of sunlight

With poorly treated mixing rooms, you end up mixing the music to suite your poorly treated room, NOT to mix the source material. Once I properly treated my room, my mixes were better, quicker, and more natural sounding without sounding thin or boomy. It takes really hearing a shitty room to really understand what a properly treated room can do for audio quality

The whole point of your videos is; accurate reproduction of the source material without the room being an addition to the sound. If you want the best, clearest sound possible, PROPER treatment is the only way to go. No audessy will fix a poorly treated room. A proper treated room wil further advanced your listening pleasure over any expensive amp, speaker cable, or any snake oil jargon out there. Room treatment is the best thing for the best sound, even shitty setups can sound like polished turds!

I love your straightforwardness in your videos. No bs.

Your knowledge sir, is fine wine. I’ve followed your tips to a T and the sound from my room is incredible. So good I ended up removing MORE speakers from my room because of how much more projection just my front speakers alone produce. I got rid of my sub and my center channel, with zero loss of resolution, if anything, I gained even more. Plus some speaker mods etc etc. but I’m stunned how little folks pay attention to proper treatment, spending thousands on equipment and still complaining about fidelity…

Good luck with this. I've owned 5 homes and never had a room where I could get this setup. How about a vid talking about how to correct for asymmetry ?

wow actual info

I read all these wonderful comments about the information provided by Dennis. But I find that there is little meat to the bones. Dennis simply wants you to call and contract him. From a purely business point of view I get it, but IMHO providing more real examples of various rooms that work instead of showing rooms and setups that don't work would be more useful. I doubt that doing so would reduce his income in anyway - and probably it would increase the trust that people give to his methods. So Dennis please present some meat, stop dancing around giving just enough to make people dependent instead of empowering.

So what else should I consider to isolate from the attic? I mean mainly thermo isolation on the attic floor that will be totally non inflamable.

Thank you for saving me from buying/building corner bass traps! I appreciate all your content.

I always thought corner bass traps were just for removing excess bass energy from the room, since bass energy likes to collect in the corners. I've never read that they reduced modes. And I would just build my own.

Guy spends 500k for an *"auditory experience"* that can be beat by a pair of basic-ass headphones.

The corners are part of it, but shouldn't be ignored. Of course you need to deal with the walls. It is common knowledge that 90 degree corners have a bass-coupling effect. Sure, you are not done with only the corners, but is an excellent starting point. At the end of the video I see the agenda. You want to sell your products.

Is it ok to glue a 5/8” & a 3/8” MDF to make a 1” sheet.

I have a 15’ x 25’ room. The ceiling is slopped from long wall to long wall. I am currently set up along the long wall to minimize side refections. Thoughts?

Where to buy those elevation platforms in Denmark??

how to elevate sub?? Cant find that anywhere? What do i put under my sub???

So if the sub needs to be in that hight what do we put under the sub then?

What about a high Shed Ceiling?

I don’t fancy center / surround / THX / etc-etc anything. I my opinion ; a single pair of ( proper ) horns, a high-quality low watt tube amp, a crescent sofa, in the appropriate room setting will trump [ all ] contenders. In other words : a, non-distorted, audiophile theatre. Y’all can have all that ; “ But wait !!! There’s more !!! ” B.S. 🍺

Best channel ever on audio treatments! Bravo!

I am no expert but fiberglass is also inorganic and requires or should require a respirator. I have installed both and neither is any fun to have in your lungs.

it is the year 2025 and I've been waiting for new measurements, relating your products. I still haven't bought any, due to your refusal to do before/after measurements and always giving everybody the run around. Please adapt and I might buy your products. Without measurements, forget it. It is time for frequency response graphs of your products in action, before and after style. I'll give you an example of what lots of people expect to see, before they buy: Pick one size of room that the general population of customers has in their homes and show off your products that way. Example: A measured room with no proprietary foam vs. a room with 70% coverage of foam (list general room volume, RTA, decay times, and Frequency Response, before and after) Feel free to add any other measurements, as per your experience. The more data you give POTENTIAL customers, the better. This style of presentation could go on and on. Another example: A measured, empty room vs. a room filled with 10 ACDA units (list RTA and Frequency response, before and after) Another example: A measured room with no treatment, vs. a measured room with the full house, ACDA's, Foam, and Diffusion. This way, even at a individual level, we can zoom down into the micro of the frequency spectrum and see what effects your products ARE or AREN'T having on the frequency response, amplitude, decay times and what happens at certain levels of product coverage. Please consider doing this and don't give us another run around answer, to what I just wrote. I've been following the channel for years and it is tiresome.. The customers are asking over and over! You talk to some of us like we are dumb. It is off-putting..

Do you place these behind the speakers or listening position?

Who the hell listens to their music in a bowling alley ?! Perhaps a simpler video, using a typical small room that is rectangular, would be more helpful?

I want to get 2 subs, and I live on a concrete floor covered with plastic that looks like wood. I imagine front-firing would still add 3dBs to the volume, but I have nowhere else to move them. The room is probably 13'x18'x8' with outlets into the entrance, hallway and kitchen.

I will be calling you when I build ✔️👍🏾💯

Denis: I am 'blessed' with a 7.5ft ceiling. When the time is correct I plan on trying a LF Helmholtz-resonator with two tubes. One tube in the room and one penetrating the ceiling - both tuned to the LF(ROOM CEILING). The idea is a Band Selective passage that sends the LF energy out of the room into the attic area where there is a bunch of insulation and a very large volume. Have you ever tried such an approach?

I do not understand. If the change after adding gain is not proportional across the room, then the system is non linear. What is the non-linearity ?? I believe superposition should apply. Correct me if this is an error. Perhaps the absorber is saturating some how? But I doubt that.

Rock wool is heavier than air. You should wear a respiratory when cutting and installing is just like with any insulation, but all particals will drop to the floor. Fiberglass insulation fibers will floar in the air. I believe rock wool is one of the best and safest insulation in the market today