Will Yip combines two different types of reverb to achieve a deeper, wider, and more intricate space around his lead vocal.
One of the reverbs is a shorter, brighter, crisp-sounding plate (1.4s), namely the UAD EMT 140.
This is blended with a larger, longer echo chamber reverb (3-4s), the UAD Capitol Chamber. The echo chamber is slightly EQ'ed (high-pass, with highs boosted) to prevent it from becoming too muddy.
When blended together, both reverbs provide a coherent, spacious vocal ambiance without overpowering the source or muddying up the mix.