What happened to my room acoustics

Helmholtz resonators are the basis of mechanical acoustics...

As you know i used them in my first room a lot ...

Distribution and location matter ...

Now in my second room with smaller speakers , i designed a new porthole for them using different straws tuned for this goal exactly as when we compute the right size of the neck volume and diameter of the resonator body ...

Then you understand my perspective ...

My goal was first learning acoustics then improve my sound without cost ...

Thanks for the information...

My best to you ...

@mahgister

In the late 70’s Randy Hooker aka RH Labs. Made a subwoofer that was a helmholtz resonator. It was a passive subwoofer down firing into a slot. It was huge in comparison to modern subwoofers, about 3 feet by 2 feet by 2 feet. They made beautiful if somewhat colored bass. Inside the enclosure the driver was housed in a larger compartment which was slot loaded into a smaller compartment. It resonated at 20 Hz forcing the driver to go down low. It was a pleated 12" paper driver, nothing special. There were no subwoofer drivers back then.

It cannot be patented... It is a basic concept of acoustic and the volume and diameter of the straws their lenght must be computed but with many straws it is a bit complex computation for me with the speakers volume but its is easier to tune it by ears ... The numbers of straws and their dimension parameters will differ for each speakers with a porthole  ... Put in simple term: instead of a single inefficient  porthole it is a complex designed  more efficient porthole ...

The concept if you search for it is : Helmholtz resonator ... Any speakers with a hole in particular is an actual Helmholtz resonator ...

Interesting idea! Perhaps you could develop this concept into a customized tube and commercialize it. Whether or not it’s an original idea of yours, being the first to own the commercial product could lead to significant success. Thank you for sharing it.

i own little speakers with a 4 inches woofer which i modified and i had clean bass at 50 hertz no boominess ...😊

How ? saying that we are in the obligation to use dsp and subwoofers as only one solution for little speakers is ignorance ...

I used four solutions :

--One mechanical which is damping with a heavy load on top of speakers when possible ...

--Isolating/decoupling with granite blocs /shungite plate/sorbothane plate /cork plate/bamboo plate sandwich which is very efficient ... ( springs can be effective by the way but ONLY used in a certain way with PRECISE tuning control of the compressive load on the springs but i dont need springs with these light smaller speakers with my other bigger speakers i used two set of springs under and over the speakers under tuned load with a precision around 100 grams this method of using springs though is not practical for all especially in a living room )

--Using my porthole speakers for what they are  acoustically : Helmholtz resonators...Then i put bundle of  straws of dfferent diameter and lenght in the rear porthole, all  mechanically tuned then to increase bass depth and clarity going from the 85 hertz specs to 50 with great clarity and impact ...I dont need costly pair of subwoofers to listen jazz and classical ...

--Using adequate room treatment and if necessary  room  distributed Helmholtz resonators ( i had many in me first acoustic room with bigger speakers but  in this acoustic smaller room i use the speaker itself as a resonator which i control ...)

Cost: peanuts ... Results : amazing ...

and a complete transformation of these well reviewed  low cost speakers which now punch way over their price and beat all the headphones i listened to ...

Then proposing general recipe for all case and for all people situations as some mandatory subwoofers when anyway they are not needed and present hard problems of their own, and some DSP equalization for bass problems presented as ONLY solution is ridiculously narrow perspective ... Tools are tools not exclusive solutions ...

To solve a room problem anyway we MUST BE THERE LISTENING and adressing the room mechanically and not only electronically especially with bass problems .. ...

Small room acoustic is very complex...General recipe means little each case of specific speakers and specific room is a problem of its own asking for a specific tuning of the couple room speakers ...