While any improvement in sound is ultimately subjective, I have owned Arro, Staff and Forest. ALL of them clearly benefited with mass loading. And this improvement was audible not only to me but to audiophile friends of mine, as well as my non-audiophile wife and kids. The benefits far exceeded what I was able to accomplish with tweaking speaker placement or even speaker cable upgrades.
And I agree that while taking the loading material out is a bit of a hassle, it should not be particulalry challenging.
And I agree that while taking the loading material out is a bit of a hassle, it should not be particulalry challenging.