I add shungite to the exterior cups of the orthodynamic Fostex T10, and at the jack at the end of cable, I wrapped in a bag a mix of 4 mm lava beads with 4 mm chrysocolla beads + one Herkimer diamond of 8 mm...The results is astounding...The sound coming from the T10 is now more around my head than just around my brain if you know what I means... The imaging improve but especially the soundstage is more coherent, and more holographic...I am in love with the T10 now... And I had not even damped it yet...This rare vintage orthodynamic is the best of my headphone now but with the stones, without them no way...He replace the marvellous cheap and modified dynamic Fostex TH-7b in my heart ...
You can doubt what I say, you can trust what I say, I dont give a damn... But this year instead of expansive upgrade use your actuel audio system and improve it at low cost in the 3 directions I had described, the electro magnetic grid of the house and of the gear, the acoustic atmosphere of the room, the vibrations resonance field of the audio system.... You will perhaps thanks me later...