PASS LAB X150.5

Second-hand. In excellent conditions. Free from any visible signs of wear. Comes with original packaging and manual.

The Pass Labs X150.5 amplifier immediately stands out for its striking presence. The classic blue analog meter on the front panel adds an aesthetic touch that catches the eye right away—an iconic feature that, while not affecting sound performance, contributes to the product’s overall charm.

From a technical standpoint, the X150.5 represents a significant evolution from Nelson Pass’s Aleph philosophy. While it retains a Class A section, it adopts a hybrid topology that shifts into Class AB beyond a certain threshold, and introduces the Supersymmetry circuit, moving away from the single-ended approach. The result is a sonic character that departs from the signature “liquid” sound of earlier Aleph models, offering instead a more neutral, clean, and transparent reproduction.

Its transparency is remarkable: every detail, even the most subtle, emerges with stunning clarity. Listening to vinyl through a high-quality analog source becomes an immersive experience, with the soundstage unfolding realistically and with great depth in front of the listener.

The extremes of the frequency range impress with their control and dynamic performance. The bass is deep, articulate, and capable of surprising even those who thought they already knew what their speakers were capable of. The energy is palpable, yet always delivered with balance. High frequencies, on the other hand, extend effortlessly and without harshness, always maintaining a refined brilliance that never becomes fatiguing.

The overall tonal character of the X150.5 is incredibly natural: warm enough, but never colored. It gives the impression of intelligent neutrality—one that doesn’t betray the emotional core of music but rather enhances it in its most authentic form.

The X150.5 is not just a powerful and transparent amplifier—it’s a true statement of intent from Pass Labs: a definitive solution for those seeking the perfect balance between technical precision and emotional engagement.

Technical specifications:

• Class: AB
• Type: Stereo
• Input impedance (unbalanced/balanced): 30 kΩ / 20 kΩ
• Gain: 26 dB
• Power output per channel (8 ohm): 150 W
• Power output per channel (4 ohm): 300 W
• Voltage for full power @ 26 dB gain: 1.73 V
• Low frequency response: 1.5 Hz
• High frequency response: 100 kHz
• Damping factor: 150
• Output noise: 200 µV
• Power consumption: 200 W
• Operating temperature: 53 °C
• Dimensions (W x H x D): 48.3 x 17.8 x 48.8 cm
• Weight: 28.1 kg