Acoustic treatment

Thanks theaudiotweak… But my result obtained only with water are enough for the day and extraordinary... I am very pleased already, the helmhotz resonator are not snake oil,pricing sometimes is, ideas are often implemented with very low cost and sufficient good result... I will not purchase audiophile resonators, I am proud of my cheap ones and astounded... Perhaps I will try olive oil some day to comes thanks Tom for the idea... Thanks also to Geoff for his impulse and astute observations...

Thanks to Geoff remarks about Helmhotz resonator... I completed the installation of 8 carafes and varied bottles with different aperture with different tubes of my own making inside, and different level of water to discover the right one and I must say the effects are astounding on all counts...And at no cost...All of you read about that and think,it is not necessary to pay anything, very simple to inplement if you try and trust your ears...

Interesting thread.... I just installed some helmhotz resonator improvised with long neck bottles and variable water level experiments, and I must say that it was an improvement with my sound....At no cost.... Perhaps not ideal but my ears  smiles... Thanks