Stromtank S 2500 Quantum 2 is a computer-controlled battery-based AC power source from Germany, equipped with the latest 48V battery and inverter technologies. Substituting the isolation-transformer and PS Audio Power Plant combo in my listening room as the AC source, the S2500Q2 transforms the sonic characteristics of the system in a very fundamental way. The mid-range and low-frequency presentation becomes much more full bodied, yet with tuneful, extended and well controlled bass response. Another impressive improvement is in the expressiveness, degree of realism and extended palate of tonal colors/shadings in vocals and instruments, enabling greater enjoyment of every music genre. Additionally, the background in the soundscape further darkens, allowing previously hidden ambient and spatial information details to stand out. With the unit in place, I also notice much easier differentiation among various recording/mixing techniques in the source material, and any audio equipment powered by it seems to demonstrate more of its true potential. Very pricey yet strongly recommended.
