The Stax Mk-2 PP is an electrostatic headphone amplifier designed to drive the Stax electrostatic headphone line, particularly suited for Lambda series models. It is known for delivering uncolored sound and ample power, ensuring an engaging listening experience. This amplifier features both Pro and Normal sockets, allowing for compatibility with various Stax headphones. Some models include a voltage switch, and upgrades are possible through re-wiring for balanced inputs. The build quality is solid, composed of discrete parts, making it largely user-serviceable. However, it's crucial to maintain its performance by replacing aged electrolytic capacitors in the power section and addressing any grounding issues that may arise, particularly with older units. The amplifier excels in providing clear audio across the entire frequency spectrum, generating high levels of detail with no noticeable roll-offs or peaks, which makes it suitable even for high-end models like the SR-404 and potentially the Omega series.
