In order to be clear and fair, we should distinguish between 'different' and 'better'. Lead was my holy grail for all things vibrational in terms of audio, until I saw the results first hand, from a completely, and I should say more open perspective.
I have speakers that have a 'lead chamber' at the bottom, and I used it for that purpose. The dynamics died (Don McLean's, The Day the Music Died") Everything exciting about music, dynamic contrasting, natural decay, all went away. We put the speakers on some spikes (Sistrum, and no I do not know the owners of the company, and have NO VESTED INTEREST HERE) under them, and it was disgusting to hear the difference. Different is not better, and better is not different, oh they may be coincidental, but not in this instance.
The spikes left the speakers 'singing' and doing the same things that all great products can do, and the lead, literally killed that sense of effortlessness.
Beware of the lead fix. As a former devotee of that, I am now cured, because I witnessed it first hand.
Best,
Larry