B, FINALLY ! FINALLY ! FINALLY !!!! Someone gets it. Thank you for your comprehension and understanding.

I put mine in the center of the room, suspended 2 feet above the ground, sounds phenomenal.

I got a big self constructed horn, made for the corner with a bass guitar speaker. He needs contact to bottom and wall to have effectively the double size. He stands in quite a small room. This sounds hard and clear. The big speaker is fast and has hardly to move to do his job. He goes only down to 55 Hz. He has his own transistor amplifier. It will never be loud because the higher amp is 2 X EL86 valves. This is enough for me.

@@AcousticFields thanks Dennis for the good videos. I prefer infinite baffle subwoofers at close to room center in a room at least 6000 cubic feet.

I know this is a late comment, but I have a q600b Samsung soundbar with a wireless sub. After watching some of your videos, I placed it in a piece of 1" polystyrene packaging, and the air movement has changed a great deal. I have been using this bar since August, and this is the best it has sounded. I can actually feel the air moving now as it plays. The wife won't thank you tho 🙃

by elevating the sub woofer he meant place that sub above from the ground, put it on a small table or anything else without creating any kind of distortion, so far i understood

+Dean Lebert Cable quality varies. You have to find a brand that you trust and have listened to. Everything in the signal chain has an impact on sound quality. You can split the output signal if you room and usage requires more energy.

Hi Dwayne, Sub woofers are low frequency producing devices. Every room size and volume has different requirements when it comes to positioning within those room sizes. Look for positions that produce quality not quantity. Most sub woofers in the marketplace are about quantity and not quality. Our testing reveals that the cabinet will produce as much "sound" as the driver. A quality manufacturer of sub woofers will spend as much time and money on the cabinet ("room") design and construction as they do the electronics and driver.

Thanks

D, Try it and let us know the results.

Fill out the information in this link. www.acousticfields.com/free-room-analysis/

Raising a low frequency device off the floor will improve room resolution and frequency response. The platform should also absorb energy. Placing low frequency absorption as close to the source as possible is ideal. Our sub platforms do both of these functions. www.acousticfields.com/product/subwoofer-platform-absorber/

T, It can do that but you would not want that. High pressure close to walls is room distortion. It is quantity, not quality. The last thing one wants is more room distortion around your speakers.

@@AcousticFields Cool so if you want accurate representation of the bass in your mixes you shouldn't put them too close to front wall. Thanks, got it.

+nublackmusic Never run your electronics at its maximum setting. This applies particularly to analog gear but it also to certain digital.

+Acoustic Fields Could you elaborate?

distortion and reducing product life span

it should match the volume of your sattelites. by ear or run sweeps and try to match the volume.

Hi Projector, It depends on room size and volume, average dB SPL and a host of other variables. There is no one size fits all.

+Jared Pennock Hi Jared, Fill out the information in the attached link and I will compare your room size and volume to our data base. www.acousticfields.com/free-room-analysis/

J, Increasing the surface area of any low frequency driver will increase output into the room. The difference from going from a 10" driver to a 12" driver is about 2 dB more energy into the room. Small rooms usually will not benefit from more low frequency sources. More low frequency energy will produce more unwanted modal pressure issues.

Hi Find Lestar Sub woofer number and positioning depends upon room volume and usage. For your room volume, one is sufficient if it is two channel listening. With a home theater system, two would be better, provided you had the necessary low frequency management in place. Without knowing much about usage and existing room treatment it is difficult to generalize. If you want a more detailed explanation, you can fill out the information in this link: www.acousticfields.com/free-acoustic-treatment-room-analysis-tell-us-about-your-room/ Thanks Dennis

W, Thank you for your response and question. With a small room like yours, we need to not use any low-frequency producing device. Technically with a room such as yours, you must keep energy below 50 Hz. out of the room completely since it will not fit within your dimensions. Use small speakers that cross above 50 Hz.

Start with placing your sub on a wheeled platform that can be easily moved. You will be moving and listening over time and to different source material. Place the sub in room center and then move left and right. Stay away from the walls. Move the sub forward and back from center point. Every move of 12" must be met with listening to different sources for at least 30 minutes.

R, Place it away from all boundary surfaces. I would suspect that a shelf would produce vibrations.

Hi Anthony, Always remember that no matter how much energy you put into a room to compensate for poor room dimensions and lack of the correct type, amount, and positioning of low frequency management technology, you can not achieve the desired room response. You can minimize low frequency issues, but never maximize performance and sonic quality.

G, Thanks. Any video ideas send them to me info@acousticfields.com

First you have to start with one sub and position it correctly.

M, Location depends on room size, volume, usage. Pressure levels are also critical. Keep them out of corners.

D, Thank you for your support.

my room is 12.25 feet wide by 19.5 feet long and 8feet tall

Hi Justin, Fill out the information in this link: www.acousticfields.com/free-room-analysis/ Everything matters when it comes to energy in small rooms.

Acoustic Fields thanks! I had actually completed the form. Looking forward to your suggestions.

Thank you for your support and following.

S, Turn it down, so there is less energy. Add large amounts of mass to the floor.

Acoustic Fields will some packing material like white foam do the job ?

S, No, a limp mass material can never be a barrier material for low frequencies. Pour 6 " of concrete on the floor and a 1/2 steel plate on top of that concrete slab. Make sure you contact a load engineer to certify the additional weight.

***** Absolutely, be happy to. Do you want to email me at dennis@acousticfields.com and we can discuss things further? Thanks Dennis

oh I'm looking forward to knowing more of this collab! love your vids Dennis and ofcourse EXO :D

Hi ***** Anton Albert I'd still love to do this but have not found a way to contact Bruce successfully to date. I tried sending you a message through youtube but no luck so far. If you pick this up do contact me as I have a unit you can put in your car to test which will do wonders for the bass. Only problem is I'm moving soon so if I don't here from you I wont be able to send and it will have to go into storage for now. Thanks

What watts are in Franken?

that would be crazy cool

M, A sub woofer is a speaker that generates low frequency energy.

...Good chat. 😜

@@jaydekaytv It's cause you said GIK 😂

+azor ahai Sub placement is room size and volume dependent . Fill out the information in this link and I can better assist you. www.acousticfields.com/free-acoustic-treatment-room-analysis-tell-us-room/

+Acoustic Fields Thank you

U, The graph is only to illustrate concept. Subs are low-frequency generating devices. They produce sound pressure issues within a room. Don't think of them as speakers with directional energy. They are pressure producing devices that radiate energy in many directions. As a pressure producing device, there are places within a room of a specified volume where their physical placement and position will produce less pressure issues.

@@AcousticFields so the myth of aiming them towards the listener is just that : a myth?

@@jeffinnh76 Yes, one of many.

Hi Bill, You will have to isolate the sub from any surface. Raise it off the floor using technology that will isolate and absorb. Here is a link to our sub platform. www.acousticfields.com/product/subwoofer-platform-absorber/

@@AcousticFields wow not being rude but you really should do a demo of what it sounds like putting a sub on the floor, and then this under it after, 750?!

S, Start in room center and move towards walls. Stay 4' from all walls.

You must consider room volume and sub output. Stay small with less output. Balance the frequencies below 100 Hz. with the middle range frequencies. Stay away from the room boundary surfaces.

Hi Danno, If the vault is consistent in angle on both sides of the peak, then add 14 + 8 and divide by 2 for average height of 11'.

Excellent, that is what I did on a SWAG/whim. Thank you!

Acoustic Fields Always love your videos and advice but this whole vaulted ceiling deal scares my to death. I have an unfinished addict (misspelled intentionally.. ) that I'm saving cash to build my dream HT/music room in. The good news is that it will be from the ground up, so I'm gathering ideas and advice prior to the build to minimize issues. Theoretically, it will basically measure 17 x 22 x 9. This can only happen if I have 6 ft high vertical walls and then the ceiling will follow the angle or pitch of the roof to the horizontal 9 ft ceiling. Makes for a nice man cave aestetically but acoutically to my non engineering trained mind, I am adding at least 2 more surfaces to "my box" and therefore, more problems/challenges with respect to optimizing the room for the best listening experience. I say at least because to get the 22 ft length, the front wall (screen) will also follow the 6 ft scenario mentioned above, so there will be that additional angled surface to consider. I could give up a couple feet of length there by building a false wall but I also see a scenario where I could recess my fronts into that false wall and then I'd be bring a couple more surfaces back into play. Yada, yada, yada.. I intentionally went on this rant to illustrate how nerve racking this whole deal is to me...and I haven't even driven the first nail or fastened a screw yet. I fully intend to take advantage of your room analysis service when the trigger time comes, but am I way out in left field with this room profile I'm considering? Is it gonna create some over the top problems that I can avoid by considering other/better room layouts based on the raw space I have to work with?

Hi Steve, Energy oscillates in waves, so you will be able to feel the energy but your room may not let you "hear" definition and separation that is possible with proper room dimensions / volume / treatment. Room dimensions and the lack of proper treatment will produce modal issues which will smear and blur definition and separation.

So (since I believe 90% of control rooms don't have those free 37.66 ft...) what you mean is with proper treatment you can feel/hear those 30Hz even though theoretically the wavelength doesn't fit ?

What is your room size and usage?

@@AcousticFields My living room is 300 sq ft and my primary uses are watching tv and listening to music.

Start with the sub in room center. Move forward and backwards in 12" increments. Spend time listening to each new position with multiple sources.

M, There are locations that minimize distortion and there are those locations that create more distortion. You must analyze room size, volume, pressure levels etc. to determine your options.

66ddot Elevating a sub woofer requires calculations. You need to know room size and volume, lowest and highest pressure level played below 100 cycles, along with a host of other variables. The platform will need to support the weight/height ratio to avoid tipping. With most sub woofers weighing over 100 lbs., easy of movement and installation along with safety, must be taken into consideration.Since the platform is connected mechanically to the sub woofer, it is a perfect scenario for using a pressure activated absorption technology. With diaphragmatic absorption that close to the source of pressure, one can reduce unwanted pressure at the source or the sub woofer itself before it gets in the room and has time to "grow", by building in that technology into the platform. Adding our activated carbon technology to the diaphragmatic platform increases absorption performance exponentially, especially in that frequency critical range with subs from 30 - 50 Hz. ThanksDennis

I, Using multiple subs to smooth out low-frequency response room curves is an expensive proposition. Each additional sub will only have a + 1 dB - + 1.5 dB improvement, if that. There is no substitute or band-aid for small rooms and their inherent lower frequency issues. You must choose the proper room size and volume to match the usage and then treat the remaining issues with the proper treatment technology.

@@AcousticFields I have many times got about +5dB (average) when adding a second identical sub. (And almost the same when going from two to four, but this time mainly only below 40Hz or so.) But this naturally requires time aligning the subs (either with equal distance placement or delay with some prosessor). And even thou I mostly avoid corner loading and 1/4 lenght (for sq reasons) I also do not place subs in the middle (1/2 lenght) of the room. Maybe putting the sub in the middle of the room (null point) equals the pressurization but it also gives very little additional dB gain. And yes - a small room is a problem for good, even and low reaching bass but only if the walls are stone. I just measured about 11' x 12' (height 8') room with all wood walls, floor and ceiling. It has two 18" IB subs (AE brand) behind the main speakers and the fr is very even (+/-2dB from smoothly raising target curve) starting from 5Hz to 120Hz (without any EQ, only 2. order LR low pass). Here below 35Hz the gain from the second sub was 5,5-6,0dB. Between 35Hz and 120Hz the gain was between 4,0-5,5dB. The measurement instruments were high enough quality (mic Eartworks Audio, mic amp/ADC RME UFX and sturdy micstand and high end cables). Thank you for making the interestind video and pointing out that it is good to use more than one subwoofer. All the best wishes.

Z, It depends on 3 variables: Room size, volume, and usage

@@AcousticFields I just measured up my basement and stairwell leading to it. The basement dimensions are 36' x 11' x 7'. 15 feet of this rectangle is my theater. My stairwell is roughly 3' x 9' x 15'. When added up I get around 3,177 cubic feet. It is a home theater for watching loud action movies.

Z, With a 7' ceiling height, you are beat before you start. I do not have any numbers in my data base to assist you with a 7' ceiling. Start with placing sub 12" off the floor in room center and moving left to right and front to rear.

+SquidCaps Low frequency energy waves will not fit in most small rooms. You need to absorb that energy with the correct rate and level of absorption. Do not think of low frequency energy in terms of radiation fields. That is reserved for middle and high frequencies.

Hi Praying, It would depend on room size, volume, driver diameter.

Starty with one subwoofer in the center of room. Move it left and right back and forth staying away from the walls. Work with one sub only for this placement test. If you do not trust your hearing, you can use a RTA or pressure meter.

Thanks.

R, It depends on room width, height, and length along with pressure levels used.

M, Start in the room center and move left or right towards the side walls. Stay away from corners and walls. Elevate the sub off the floor at least 12" to start. Place it on a caster platform so you can easily move it around during the tuning process.

@@AcousticFields thank you for your generous reply. I greatly appreciate it!

S, Start at room center and move left and right. Then move forward and backward along the side walls.

A, Quantity is not quality. I will keep saying that until the day I die. Reducing peaks in room response below 100 Hz. by using multiple sources is neither cost effective nor quality sound producing.

@@AcousticFields the science disagrees with you but that's your prerogative.

A, Let me see your science.

@@AcousticFields here is Harman science: www.audioholics.com/room-acoustics/optimum-locations-for-subwoofers-in-rectangular-rooms And real results in my odd shaped rooom: www.audioholics.com/home-theater-calibration/bass-optimization-for-home-theater Harman has tons of peer reviewed papers submitted to AES on this topic. At trade shows they use 4 corner loaded subs with Sound field management and NO passive bass trapping at all and the bass is stellar in EVERY seat and row. It works! Passive bass trapping is a requirement for music production but mostly unneeded for sound reproduction in small rooms utilizing active subwoofers and EQ.

Acoustic Fields, Audioholics, I think you are both right. Subwoofer placement, room size, room corrections, eq, and room treatments are all important.

R, Sub placement depends on many variables. You must analyze average pressure levels used, distance from each room boundary surface, ceiling height, room volume, and a host of other variables. After you satisfy all of those variables, you find a starting position and tune from that position. The sound quality in the start position will change with pressure levels used. There is no one size fits all.

Different subs operate at different speeds. If your room is high resolution, then you will hear those differences.

L, There are no "tricks" when it comes to physics and its application. Placing the subwoofer at the listening position and using that variable as your start point depends on room width and ceiling height. Everything involved with low-frequency pressure varies with usage pressure levels, size, and volume.

Lukas bock! That's exactly what i do and works perfectly😎✌im not saying that he's wrong...but so far we work same way and sounds amazing

The Reciprocity Principle at work. And yes, it does work.

This principle is similar to preying for rain, and when it works, claiming praying for rain is the best way to make rain. This method will sometimes work and sometimes not. It works not because the method works, the results are random so you get some hits, but there are cases we're it doesn't work too. Using this method does not take guessing out of the equation, you need to measure the room if you want to find the best spot.

Hi Jon, Why do you want to raise the SPL of low frequency energy? Don't we have too much energy already in our small rooms? Isn't the goal to have more balance in our sonic presentation? We want less room sound not more. Raising the sub allows for pressure balance within the room by reducing SBIE among other issues.

Is this an answer for a home studio or a mobile DJ? Why wouldn't I want to maximize/optimize speaker performance. I have volume control to adjust if its too loud. I'm humbly asking, I'm sure you know more than me. If I'm lugging in a heavy sub, Im going to do all I can to maximize its performance.

Hi Jon, I believe we are talking about two different issues. You are needing quantity not resolution. In small rooms, our goal is not quantity but resolution of all frequencies. If your goal is quantity then adding room sound will increase output and loudness.

Yes, I am talking about live sound - DJ events. Thanks for clearing that up

DJ, Not completely true. Corner loading produces more room gain at middle and higher frequencies. The quantity gain is not worth the quality cost. Not in any room.

A, We place our subwoofers on platforms that have casters on them. This allows for easy positioning. Finding the proper location for your room size/usage/volume is a tuning process that takes time and constant repositioning.

E, Our carbon technology is used in certain designs.

Lets us know what it sounded like.

C, It depends on how you define pressure. Lower frequency energy below 100 Hz. in room acoustics is wave physics which is pressure based. Energy above 100 Hz. is ray physics with less emphasis on pressure and more on reflections. Treatment emphasis is on air flow versus pressure reduction..

C, No application in this video, just definition and explanation. Application video to follow.

D, The goal is to minimize quantity and focus on quality. People zig and zag between these two extremes all the time. The issue with both approaches is that they are both working in rooms that lack the proper type and amount of low-frequency management technology. Once your room is managed correctly with the proper type, amount, and position of treatment, neither extreme is an issue.

The location of any low frequency device is room volume dependent along with the pressure level of the usage within the room. Keep it away from all boundary surfaces. Stay away from the corners.

I do not understand your comment. Please explain.

@@AcousticFields pls put some limiter or somethin on ur audio track. Towards the end of video, ur voice blown my eardrum away. And in the middle voice is feeble. Hope u got the issue.

Thank you , always appreciated.

Hi Jim, Low frequency energy is all about sound pressure and trying to get it to "fit' into a box "room". The position of the low frequency generating device within our rooms is dependent on many variables. It is dependent on room dimensions, volume, SPL level, construction methodology used to build the room, and a host of other variables. Creating a stereo image with a mono energy source that is felt instead of heard is not possible. The goal is pressure management within room size and volume. Once managed correctly, you can not localize the position of the sub. The only given I can tell you in this maddening process is to raise it off the floor. Elevation heights are from 12" - 36" based upon our testing. The platform you use is critical in this process. We use our carbon technology to reduce the floor to sub contact, elevate the sub, and absorb energy close to the source.

The sub should "float" off the floor to reduce unwanted floor vibrations? That makes perfect sense. I got to check out your site.

There is no ideal place. The final positioning will only be decided by a month or so using room "voicing" process. The final position is dependent on frequency, amplitude, room physical dimensions, and a whole host of other variables to consider. Physics can only take you to the edge of the math, the rest you have to listen for.

V, Walk me through how you time-align below 100 Hz. in small room volumes.

P, You can get plenty of low frequency energy from one sub if it is positioned correctly and the room has the appropriate low frequency management. Adding more subs means you are wanting more because of lack of low frequency treatment.

S, There is no "usual" placement for a low frequency device in small rooms. It's location depends on room dimensions, pressure levels used, and a host of other variables. We offer solutions that improve sound quality regardless of the belief systems of our viewers.

P, There are numerous variables to consider. There is no one size fits all. Driver number, diameter, SPL used in room, room size and volume, just to name a few.

T, I can only assist you with the physics of small room acoustics.

A, You want an even distribution of energy throughout the room. You can use a subwoofer to obtain that distribution if you choose the correct room size and volume and have a low-frequency driver that fits the room. Along with that requirement, you need proper treatment and positioning of the low-frequency source. You must balance multiple variables.

No. You don't want bass boom. What you want is low frequency that you can hear and feel but you don 't hear the boom. You just feel it shaking you and being powerful with being able to distinguish every texture of low frequency sound it emits. Bass boom basically eats all of that like a parasite and tires out your ears.

S, Go ahead and fill in the do's and don'ts for people.

Acoustic Fields the video is called "ideal subwoofer placement..". There is not much about it, I watched your other videos which are much better, but this one just isn't explaining enough about the subject. Dos and don't like, don't place it on the floor, don't place it in the middle under the des etc. Measure the room acoustics to find the ideal placement spot(s) and so on. You are the expert amd know for sure every detail. Glad you took the suggestion so joyfully :-)

S, Educating people on the science of physics is a step by step process. Most people we find, cannot even add or subtract numbers correctly. We start simple and increasing complexity as the views on the subject warrant.

Acoustic Fields thanks for the replies. I don't know a better expert on the subject than you are. I know you do free consultation which is also great and have a very good opinion about your knowledge. Just, I feel this one would be much better if made more simple and straight to the point so to speak. Regards!

O, Placing multiple channels of anything in a small room is never a good idea if your goal is music sound quality and speech intelligibility. One could make the argument that it is just a tactic to sell more speakers.

Acoustic Fields you sir drive a hard reason. It's a shame, it's so smart and simple to follow the animated gifs they have on their website.

Hi S, Bass doesn't really boom. It is the air oscillation between the room boundary surfaces that causes the noise.