Streaming YouTube

Lately I've been watching/listening to some YouTube music videos e.g.  Elise Legrow, The Teskey Brothers, Tedeschi-Trucks etc. via a Sony Bravia > Cambridge CXNv2 / Luxman LX-380 / Devore Super Nines. My old ears like the sound but wondering if anyone has suggestions that might improve the sonic quality or if this is even possible. thanks