Name: INT-25 Amplifier
SKU: 264527

Product Details ＋

The Pass Labs INT-25 is an integrated amplifier and a harmonious fusion of power and precision in a single chassis. The INT-25 combines the exceptional performance of the INT-60 line-level preamplifier with the robust power of the XA25 amplifier, resulting in a formidable all-in-one solution for audiophiles. With its pure Class A topology and 25 watts per channel output, this integrated amplifier delivers breathtaking clarity and dynamics, effortlessly driving a wide range of speakers. The INT-25 features precise volume control and input selection, along with a host of connectivity options including balanced and single-ended inputs. Its sleek, minimalist design embodies Pass Labs' commitment to both aesthetics and audio excellence, making it a standout choice for those seeking uncompromising sound quality and convenience in one exceptional package.

Dragon Cable Recommendation: we recommend pairing the INT-25 amplifier with our award-winning . The Silver Dragon Interconnect is one of our best-selling cables at Moon Audio. Sold in Pairs, it is our top-of-the-line silver conductor-based interconnect. With a braided geometry and amazing shielding, this interconnect is a remarkable solution where noise isolation is key. The is also recommended to provide the cleanest and unbridled power to your high-end amplifier.

The INT-25 amplifier sports a brand-new design by Pass Labratories, inspired by the over fifty years of Nelson Pass' expertise of power amplifiers and the progression of combining sound, style, and performance. The INT-25 carries on the same legacy of beauty, in both the machine and the joys of listening to music.

The INT-25 is a Class A amplifier with 26dB of gain, amazing noise and distortion measurements, and much more. Inside the box you'll find the remote control, power cord, and spare fuse. The speaker binding posts can accept spades, banana plugs, or bare wire.

On the front of the amplifier, you'll find the large volume control, a volume digital meter, and buttons for on/off, mute, and three input options for external audio gear to connect to your system.

Design Elements of the INT-25

Pass Labs crafts FET amplifiers characterized by robust output stages, expansive heat sinks, and substantial power supplies. Utilizing premium components in uncomplicated linear configurations, these amplifiers are meticulously assembled and evaluated. Their performance is exemplary, both in measurements and auditory experience, with proven reliability. Through two decades of continuous innovation, the X and XA series have maintained their position at the pinnacle of high-end audio.

The INT-25 distills this legacy into a more compact form. This Class A stereo amplifier, offered at a more accessible price point, leverages reduced power demands to incorporate streamlined single-ended circuitry with a minimized component count in the signal path. Consequently, it eliminates degeneration—often referred to as "the other negative feedback"—across all stages.

The simplified architecture, featuring fewer gain stages, enhances both speed and stability. Operating at lower voltages enables the use of higher bias currents in gain devices, pushing them further into Class A territory. Advanced power FET technology supplants arrays of small parallel transistors with a single pair of industrial-grade devices, each rated at 700 watts and 40 amps. Equipped with a novel constant-current bias circuit that mitigates temperature fluctuations and is free from current-hogging concerns, these devices interface directly with speakers. This direct connection, devoid of ballast resistors, yields minimal distortion and optimal damping factor. The absence of degeneration further boosts efficiency and Class A operating current, facilitating extended Class A performance with low impedance and reactive loads.

At the amplifier's core, a straightforward front-end employs two pairs of Pass Labs' preferred NOS complementary FETs in common-source configuration, integrated into a current feedback (CFA) design. The preamplifier section presents a simplified, single-ended adaptation of its counterparts in the INT-60 and INT-250 models, featuring three line-level inputs without line-level output.

Every element in the audio chain, from the microphone to the speaker, imparts an enduring signature to the music. The XA25's amplification stage, being direct-coupled, eschews DC servos and frequency compensation, ensuring a transparent audio path. In keeping with Pass Labs' philosophy, the INT-25's technology and construction serve solely to enhance the listening experience. While it boasts impressive technical specifications, its true distinction lies in its subjective qualities. In a market where technically proficient products often lack vibrancy, this amplifier injects fresh vitality into musical reproduction.

Pass Labs and First Watt

Pass Labs and First Watt were founded by hi-fi legend Nelson Pass. After co-founding and later selling Threshold Audio, Pass began working out of his Auburn, California, home in the early 1990s to develop prototypes of single-ended Class A amplifier designs under the name Pass Labs. Pass Labs quickly became known for its commercially produced Aleph, X, and XA Series amps, and preamps. Pass later started First Watt as a passion project focusing on low-power amps for a niche audiophile audience. Today, Pass splits his time between the two companies, with production happening in Pass Labs' facility in Foresthill, California, USA. Some of Pass Lab’s most notable products include the HPA-1 Headphone Amplifier, their integrated amp series (featuring the Pass Labs INT-25, Pass Labs INT-60, and the Pass Labs INT-250), the Pass Labs XA25, and more. If you’re looking for a monoblock amplifier, stereo amplifier, integrated amplifier, or headphone amplifier, then Pass Labs has everything you need for your high-end audio. Visit passlabs.com for more info.

Features:

Class A Operation: Utilizes pure Class A operation for pristine sound quality and low distortion.
25 Watts per Channel: Provides 25 watts of power per channel into 8 ohms, suitable for a variety of speakers.
Combination of XP-12 Preamplifier and INT-25 Amplifier: Integrates the highly regarded XP-12 line-level preamplifier with the INT-25 amplifier for a seamless all-in-one solution.
Symmetrical Circuitry: Ensures balanced and accurate audio reproduction, capturing fine musical details.
High-Quality Components: Meticulously selected components contribute to the amplifier's exceptional sound clarity and dynamics.
Precise Volume Control: Features precise volume control for fine adjustments to suit individual listening preferences.
Balanced and Single-Ended Inputs: Single-ended (RCA) inputs for flexible connectivity options.
Musicality: Known for its musicality, the INT-25 amplifier allows listeners to fully immerse themselves in the nuances of their favorite music.
Minimalist Design: Boasts a clean and minimalist design that reflects Pass Labs' commitment to simplicity and performance.
Robust Build Quality: Crafted with attention to detail and high-quality materials for a durable and long-lasting amplifier.
Efficient Loudspeaker Compatibility: Ideal for use with sensibly efficient loudspeakers, providing engaging and detailed sound reproduction.
Reliable Performance: The INT-25 amplifier is designed for reliability and long-term performance, requiring minimal adjustments.
Exceptional Transparency: Delivers exceptional transparency and clarity, allowing the listener to hear every detail in the music.

What's in the Box?

INT-25 Amplifier
Stock Power Cable
User Manual

FAQ

What is the power output of the Pass Labs INT-25 Integrated Amplifier?

The Pass Labs INT-25 Integrated Amplifier delivers 25 Watts per channel into 8 ohms. Despite its moderate power output, the INT-25 is designed to excel in driving high-quality speakers with precision and clarity. Its Class A operation ensures a clean and detailed sound signature, making it an excellent choice for discerning audiophiles who prioritize sonic purity.

What are the key features of the Pass Labs INT-25 Integrated Amplifier?

The Pass Labs INT-25 is packed with features that appeal to audio enthusiasts. It includes a fully balanced input stage and a discrete, direct-coupled FET output stage for exceptional signal integrity and low distortion. The INT-25 also features a high-quality volume control system, remote control operation, and a home theater bypass mode for easy integration into a multi-channel setup. Its compact size and elegant design make it versatile an