Not knocking his playing at all. Its just the bass tone gets weak and lot of fret rattles. When he hits the lower notes it seems fine. I'm using Beyer D headphones too so its not because of the laptop.
I've noted that with others playing them too. Stanley Clarke tone i find the same. Again an excellent player but his tone weakens. I guess its just a personal taste thing.
I would still love an Alembic. Any version to be honest as i love how they sound in a band. No other bass sounds quite like them.
Dave