Pass Labs X2.5 Preamplifier The Pass Labs X2.5 is a high-end preamplifier that is designed to provide the ultimate in sonic performance. This preamp features a number of innovative technologies that help to deliver a pure and uncolored soundstage. One of the key features of the X2.5 is its use of Pass Labs proprietary Class A circuitry. This circuitry is designed to provide a high level of detail and resolution, without any harshness or grain. Another important feature of the X2.5 is its use of Pass Labs Balanced Differential Input. This input design is said to offer a more accurate and precise soundstage than traditional single-ended inputs. If you are looking for a high-end preamplifier that will deliver the ultimate in sonic performance, then the Pass Labs X2.5 is a great option. This preamp is made with the highest quality materials and features some of the most advanced technologies available. As a result, it is capable of delivering a truly immersive and engaging listening experience. Features:Class A circuitryBalanced Differential InputHigh level of detail and resolutionClean and accurate soundNo noise or distortion Specifications:Input: Balanced XLR, Single-ended RCAOutput: Balanced XLR, Single-ended RCAGain: 18dBFrequency Response: 20Hz-20kHz, +/-0.1dBTotal Harmonic Distortion: 0.005% Condition:Used in excellent conditionMinimal visible cosmetic wearFully functional