The Law of Accelerating Returns

@mahgister 

Helmholtz treatment "only" work on ONE frequency and to bring down a peak in that very specific frequency and nothing more or less.

So you had 100 bulky Helmholtz devices around your room probably not that bulky when you have 100 of them so they are smaller and then less powerful.

So you can treat 100 different PEAKS in 100 different frequencies.. and or probably several of them treating the same frequency peak when they're not that big and powerful.

It would be fun to listen to that system when all correction is done in the physical domain.

But if I had that much problems with my room and the placement of speakers and sweet spot then i would never put a stereo in that room that seams be a room from hell in my opinion.

Lets compare a miniDSP has 10 PEQ filters and each one of them IS like a Helmholtz actually! In the sense that a PEQ use a specific frequency just like the Helmholtz, then we can adjust it to take a higher amplitude of a peek in dB but narrower OR lower but in a wider frequency band around that specific frequency.

So IF anybody has the time (week/weeks) and patience (in theory) to build AND tune 10 Helmholtz that needs to be of different volume so it would be possible that achieve almost the same what a DSP would do better in 5 minute. (And if you move anything or get new speakers or something then it needs to a retuning..)

But to take those 10 and tenfold them to 100 yeh maybe that is needed when they probably is smaller and less powerful that they need to be If there were only 10 of them.. Just imagine to take 100 books and place them on the floor, and scattered around on the floor around the sweet spot, and a book is far smaller than a Helmholtz resonator.. i can not imagine that mess.. (and then also add all the other treatment types that you also mentioned.)

I will crawl back under my stone when I really don't have bandwidth to maintain a discussion. 🥰

Is it a I purchase with a 'Money is no Object' attitude to my System building ?

Or, I am content in buying from Vendors with a

'No shame here about the added Mark Up' attitude ?

If a person is taking the idea of producing a HiFi System seriously and they want to incur a vast outlay whilst doing so, they are more than welcome to the experience.

The assembly of devices and ancillaries at the end, does not in any way suggest it betters lesser costing set ups.

The only asurity is that the initial cost is what it cost.

Hypothetical - A system purchased in 2018 cost £ 400 000 ( $ 520 000 ).

A system containing all the same components and ancillaries in 2022 is purchased as New,  Ex Demo, and low usage used items for £180 000ish           ( ($195 000ish ).

Leaving the set up environments out of the equation, and Purchased Brands.

When only focusing on the Purchase Value, in most minds, when prompted to suggest which one is the better system, the more expensive will be the most likely one selected.

A TT Producing Company whose Patrons were visitors to my Demonstration Room at a Public Attended Exhibition, had revisited my room on a few occasions.

On one visit when the room was with less visitors, they gave my system a very healthy appraisal and suggested it was sounding on par with systems they have heard from their customers, of which some are in access of £300 000.

Appreciative as I was, I inquired if their customers Journey's had been filled with as much fun as mine, in efforts undertaken to build a system, that for me is quite satisfying and has a trail of friendships made in its wake. 

"As for price, you are not going to get top quality sound from a $500 tt or a $700 dac. $7k for a dac, $10k for a tt/cart/tonearm, now you are getting into good sounding gear."

Pay more attention to the quality of engineering and design implementation. Most importantly listen with an open mind and let your ears be the judge instead of the price tag, unless bragging rights and status is all that really matters to you.

Yesterday I adjusted the crossover setting on my subwoofer and changed its position relative to the front wall. Let's say the crossover adjustment applied about 50 cents worth of time and effort to a $20K system.  The bass response  improvement may not have been as great as adding a subwoofer in the first place, but then, the cost was far far less. 

However, the "law" won't necessarily apply if you just start fiddling with dials (or spending money). You first need to identify where your system needs improvement (for example, in the sounds of kick drums.)  

Helmholtz treatment "only" work on ONE frequency and to bring down a peak in that very specific frequency and nothing more or less.

NO! they can be used to notch around a frequency. To contour a particular frequency or by using slot vs tube vary a single resonator to encompass several frequencies with less control but over a much wider bandwidth. 

Helmholtz is the ONLY way to tune a room completely. 

I've even used passive radiators as frequency collectors vs frequency producers. 

The concept can be used to increase a given frequency by notching around it and lowering the over all SPL. I use several different resonators and  two huge 100+ cubic foot pipe collectors. It looks like a pipe organ turned sideways in both corners of the front wall, floor to ceiling 36 x 36 x 96" but they are behind the wall. Different diameter ABS tubes are sticking out of the wall.

Many of the tubes are capped, about 1/3 aren't, the ones that ARE capped are used to diffuse, the ones that are not, are used for tuning. You simply push or pull them further in or out of the wall. You pick the correct size 1/2" - 6" pipe uncap it and tune it. I also use 4 more adjustable tube traps for the rear and sides, with slot style wall resonators for fine tuning.

You can hear a fly fart if you want.. :-) I think that would be in the 18khz range.. LOL

10hz to 15khz 100% tunable..

BTW ALL the traps on the walls and floor are decoupled from the wall and floor..

Speakers, Subs, and any object with equipment on it.. (Especially TTs) are decoupled. A sound changing experience for life. The same for servo driver systems and small planars.. A different sound that is very appealing to me..

Equipment? Gear? Take your pick and go from there. After the ROOM everything else is pretty superficial. All those thing that did make such a big difference before don't amount to a hill of beans.. 10K integrated means squat then, when a 2K total system will sound better. It's the room and tuning it along with decoupling and refining the quality even more.

Did I mention electrical? :-) This is when "Doris get's her oats".