Why It Matters — What the Solera Method Does for Brandy

Aging brandy in oak barrels (especially a mix of new-oak plus sherry/port casks) helps impart depth: wood aging contributes flavors like vanilla, spice and oak, while previous sherry/port casks can lend richer, wine-influenced notes (dried fruit, nutty, sweet-wine character). This layering can create greater complexity compared to a brandy aged in just a single type of cask. (This is consistent with general principles of barrel aging brandy.) Wikipedia+2Quality Liquor Store+2
The solera system — by blending across different ages — tends to smooth out extremes, giving a brandy that’s harmonious: mature but not overpowering, with subtle flavors from many years.

Solera Aging