Pass Pass Labs XS preamplifier and Pass XS 300 power amp

Pass Labs XS preamp, flagship, mint condition, single owner, original packaging and manual included, silver finish. Electrically flawless, fully tested and inspected by our workshop.
Price 17.500€

The Pass Labs Xs Preamplifier is the ultimate flagship, dual-chassis reference line-stage preamplifier from Pass Laboratories, engineered without cost constraints to represent the pinnacle of solid-state audio performance.

Dual-Chassis Design: Features a completely separate power supply chassis that houses massive toroidal transformers and extensive filtering, isolating power line noise and magnetic interference from the delicate audio circuitry in the main control chassis.

Pure Class A Circuitry: Utilizes a true dual-monaural, DC-coupled, pure Class A topology built with custom, hand-matched JFETs and MOSFETs to achieve ultra-low noise, maximum channel separation, and high dynamic headroom.

Precision Volume Control: Employs a custom electronic attenuator with micro-stepped resistor networks, delivering precise volume control with perfect channel matching and zero signal degradation.

Connectivity & Routing: Offers comprehensive balanced (XLR) and single-ended (RCA) inputs and outputs, allowing seamless integration into high-end reference systems with flexible routing and gain settings.

Heavyweight Build Quality: Housed in massive, precision-machined aluminum casework featuring Pass Labs' signature industrial aesthetic, engineered to dampen mechanical resonances and shield sensitive internal components.



Pass Labs XS 300 flagship monoblock amplifiers, 4-chassis configuration (2 per channel), mint condition, single owner, original packaging and manual included, silver finish.
Year 2016, currently in production with a retail list price of €133,000 per pair. Electrically flawless, fully tested and inspected by our workshop.
Price 49.500€

Designed by Nelson Pass and Wayne Colburn without budget or size constraints, they represent the ultimate expression of pure Class A solid-state amplification technology.

Architecture and Topology
4-Chassis Configuration: A complete Pass XS 300 stereo system consists of 4 separate chassis. Each monoblock channel utilizes two distinct modules connected via high-current umbilical cables:

Power Supply Chassis: Houses oversized toroidal transformers and dedicated filter capacitor banks to isolate mains noise and magnetic fields from signal circuitry.

Gain/Output Chassis: Contains the input stage and power transistor banks, thermally and electrically isolated.

High-Power Pure Class A: Capable of delivering a continuous 300 Watts into 8 Ohms and 600 Watts into 4 Ohms, remaining constantly biased in Class A without ever shifting to Class AB.

Low-Feedback Topology: Utilizes single-stage gain circuitry with minimal global feedback, preserving the harmonic integrity of the original signal.

Inputs: 1x Balanced XLR, 1x Unbalanced RCA

Dimensions (each chassis): 48.3 cm (W) x 69.8 cm (D) x 28.0 cm (H) / 19" (W) x 27.5" (D) x 11" (H)



We are dealer and distributor in Italy and ship worldwide.
We accept wire transfer on our company bank account or PayPal (adding 6% commissions).
You can find the advice on our website at: www.mondoaudio.it/prodotti/usato/