Introduction

SR-1 Owner’s Manual

The SR-1 (Son of Rushmore) is the successor to the Rushmore loudspeaker system produced by Pass Labs between the years 2003 and 2008. The design goals are similar, but product is different.

The Rushmore aimed for high dynamic contrast and control with very low distortion. This was achieved with the finest quality “strong motor” drivers intimately coupled to single-ended Class A amplifiers. Each driver (deep bass, midbass, midrange, and high frequency ribbon) operated over a limited frequency band tailored to its strengths by a passive filter at the input of each of the four amplifier channels. The high efficiency (98+ dB/watt) cone drivers also had very high power handling (up to 400 watts), and the ribbon tweeter extended from the top octave and far beyond the audio range.

The result was a stunning display of clarity and dynamics. With each speaker driver enjoying its own amplifier and operated at small percentage of its capacity, the control was precise and the curtains of distortion parted to reveal phenomenally subtle inner detail. They were accurate and musical. They kept their detail and dynamics at loud and soft levels. Made from Gabro (a deep-sea granite) and piano-formed Cherry layers, they weighed just under 400 pounds each and cost a small fortune.

It’s six years later and we no longer make the Rushmore – the cost of parts, material, processes and shipping have skyrocketed. In this time we have developed its successor, unimaginatively christened SR-1.

The SR-1 is also a four-way system, and the target is still high dynamic contrast, control and very low distortion. Realizing that most customers already have favorite amplifiers or want the opportunity to experience different electronics and cables, we designed it with an internal passive crossover.

Having a network mediate between the amplifier and driver is not without its problems. The loudspeaker drivers no longer have access to source with a high damping factor, and the variable impedance of

SR-1 specifications

The Pass Labs SR-1 is an outstanding addition to the elite category of high-performance audio components. Designed by renowned audio engineer Nelson Pass, the SR-1 represents a culmination of decades of innovation and expertise in the field of high-fidelity sound reproduction. Known for its exceptional sound quality and advanced engineering, the SR-1 is a top choice for audiophiles and music enthusiasts alike.

One of the defining features of the SR-1 is its innovative circuit design. The amplifier employs a Class A topology, which is renowned for its ability to produce an incredibly detailed and warm sound. This design minimizes crossover distortion and ensures that audio signals retain their integrity, resulting in an immersive listening experience. The amplifier’s robust power supply further enhances performance, providing ample current delivery to handle dynamic peaks without compromising sound quality.

The SR-1 also integrates advanced thermal management technologies. With large heat sinks and a well-ventilated chassis, the amplifier can operate efficiently, avoiding overheating even during extended periods of use. This feature not only enhances reliability but also ensures that sound performance remains consistent over time.

Another key aspect of the SR-1 is its flexibility in connectivity options. The amplifier features multiple input selections, accommodating various sources such as CD players, turntables, and streaming devices. The SR-1 is engineered to deliver a wide range of impedance matching, allowing users to connect it seamlessly with different kinds of speakers, ensuring compatibility and optimal performance.

The aesthetics of the SR-1 are equally impressive. With a sleek aluminum chassis and elegant design, it not only fits well in any audio setup but also stands as a statement piece in home entertainment systems. The controls are user-friendly, providing easy access to essential functions such as volume adjustments and input selections.

In summary, the Pass Labs SR-1 is a true testament to high-end audio engineering. Its combination of Class A amplification, exceptional build quality, advanced thermal management, and versatile connectivity makes it a standout choice for those seeking unparalleled sound quality. Whether used in a casual listening environment or a serious audiophile setup, the SR-1 delivers a captivating audio experience that captures the essence of music.