Every piece of equipment is different in how it reacts to RF and EMF. Measurements are based on experience on what components benefit from 3M absorber application and listening to how application in areas improves or degrades the sound. The 3M material’s data sheet give some suggestions on where to use material, but you need a highly revealing system and a good ear. Thus it is listen to a song snippet from sweet spot. Apply absorber. Return to sweet spot re listen to song snippet. The hone in on how much a where sound best and most natural.
The thread I created in power components chronicles my 3M application discovery
@dchang05 has played with P15 and AB7050HF application.