To make the Spectrum 004, a two part maturation technique has been employed, the first being maturation of New Make spirit in ex-Bourbon casks followed by transferring the aged spirit into the custom barrels. The custom barrels are made with 4 different kinds of staves , new American Oak with Char level 3, new French Oak with light toasting, ex-Olorosso staves and ex-PX Sherry staves. The aforementioned barrel has equal proportions of all four kinds of staves arranged in a one-after-the-other manner lending their own characteristics and complexities to the malt coming into its own on the nose and the palate.

The Spectrum is a testament to Amrut and India's commitment to constantly innovate and release whiskies that will push the boundary yet amaze the discerning consumer what the 'liquid gold' can be capable of with a twist of innovation.