Very speaker dependent, but I’ve found them very effective on some. I’ve had a set of Tannoys, currently have a set of Fostex T90A with L-pads which I’ve found very good, though I don’t need to use them with my current Bastanis OB’s.
“Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”
Hunter S Thompson