Spark is a powerful guitar amplifier plugin that accurately recreates the sound of iconic Marshall tube amps. It features four distinct amplifier models inspired by well-known Marshall designs, including the AFD, JCM 800, and JMP Super Lead and Bass series. These amp models incorporate classic tube types such as 12AX7, 6L6GC, and EL34, delivering authentic tonal characteristics that capture the warmth and dynamics of vintage tube amplification.

Complementing the amplifier section, Spark offers four cabinet simulations based on renowned 4x12 speaker cabinets from Bogner and Marshall, equipped with classic speaker models like Celestion G12T-75, V30s, Greenback, and JBL K120. Users can enhance their tone further with a selection of popular microphones including Shure SM57, Sennheiser MD441, and Royer R121, enabling precise shaping of the guitar sound. The plugin also includes a range of effects such as noise gate, several overdrive pedals inspired by Ibanez and MESA/BOOGIE designs, stereo chorus, delay, and reverb effects to add depth and character.

Spark supports multiple oversampling options and sample rates to suit different production needs, allowing users to balance performance and audio quality. While the demo version includes some limitations like occasional silence and inability to save presets, it provides a solid representation of the plugin's capabilities. Overall, Spark offers a comprehensive guitar tone solution with detailed amp and cabinet modeling combined with essential effects, making it a valuable tool for guitarists and producers seeking classic Marshall tones in a digital format.