2155 Power Amplifier

Date of manufacture : Jan 85 - Jan 87

Please note that this document contains the text from the original product brochure, and some technical statements may now be out of date

•Power output conservatively rated at 55 watts per channel into 8 or 4 ohms.

•+3 dB IHF Dynamic Headroom for peaks: 110 W/ch at 8 ohms, 130 W/ch at 4 ohms.

•High-current output stage, able to deliver peak currents up to 40 amperes for precise control of voice coil motion with speaker impedances as low as 2 ohms.

•Bridging circuit yields 150 watts continuous power, 250 watts IHF dynamic power.

•Exclusive NAD impedance selector optimises power delivery to either high or low speaker impedance.

•Soft Clipping™ minimises distortion at output levels above the rated power.

NAD leads the audio industry in producing amplifiers with high-headroom circuitry and high-current out- put stages, precisely the qualities needed for musically accurate reproduction of today’s wide-range analogue and digital recordings. The 2155 power amp is one of the finest in a long tradition of highly praised NAD amplifiers, with increased power, improved reliability, and numerous refinements in sound quality. As a high-current high-headroom power amplifier it drives even “difficult” loudspeakers to surprisingly high volume levels with clean, solid, full-bodied musical sound that remains refreshingly free from distortion even in transient peaks.

The 2155, which is simply the power amplifier section of the 3155 and 7155 packaged on a separate chassis, is NAD’s “building-block” amp, offering a variety of convenient and economical approaches to up-grading a stereo system for higher performance and power. The 2155 is an obvious choice if you want to upgrade from a low-powered receiver or integrated amp, or if you are using a separate preamplifier. If you need still higher power, a pair of 2155s in the “bridged” mode deliver nearly three times as much power output for only twice the cost.

The 2155 delivers substantially more than its conservatively rated 55 watts/channel into the complex and varying impedances of real loudspeakers. In the bridged monophonic mode this amplifier is rated conservatively at 150 watts continuous output. And these amplifiers maintain a full 3 dB of IHF dynamic headroom (2.5 dB in bridged mode), meaning that they deliver twice their rated power in brief bursts: over 110 watts/channel in stereo and about 250 watts in bridged configuration. This headroom for peaks is crucially important for reproducing the uncompressed transients in modern digital and DBX- encoded recordings.

When combined as a bridged stereo pair, these amplifiers function as a 150 W/ch stereo amplifier with 250 watts per channel of short-term output. That power, together with the remarkable flexibility and flawless sonic performance of the 7155 or 3155’s preamplifier section, make these combinations remarkable best-buy systems.

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NAD 2155 brochure Power Amplifier
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2155 specifications

NAD 2155 is a noteworthy product in the realm of audio amplification, recognized for its exceptional performance and user-friendly design. It is a powerful stereo receiver that integrates a range of advanced technologies to deliver high-quality sound. The NAD 2155 is particularly well-regarded for its versatility, making it suitable for both casual listeners and audiophiles alike.

One of the standout features of the NAD 2155 is its robust power output. It is designed to provide significant wattage per channel, ensuring that even demanding speakers receive adequate power for optimal performance. This power capability allows the NAD 2155 to handle dynamic musical passages without distortion, providing a rich, full-bodied sound that enhances the listening experience.

In terms of technology, the NAD 2155 employs Pulse Width Modulation (PWM) in its amplifier design. This allows for more efficient power management, resulting in less heat generation compared to traditional linear amplifiers. As a result, the NAD 2155 operates cooler and can maintain consistent performance even during long listening sessions.

Moreover, the receiver features a high-quality Digital-to-Analog Converter (DAC) that improves the clarity and detail of audio playback. This component is crucial for ensuring that digital music sources are translated into sound with precision, enhancing the overall sound fidelity. The NAD 2155 supports various inputs, including HDMI, optical, and coaxial connections, making it compatible with a broad range of modern audio devices.

Another aspect that sets the NAD 2155 apart is its intuitive interface. The front panel is equipped with easy-to-navigate controls, allowing users to adjust settings seamlessly. An included remote control further enhances convenience, providing access to all features from a distance.

The NAD 2155 also emphasizes build quality. Constructed with durable materials, the chassis minimizes vibration and interference, which contributes to clearer sound reproduction. Its design is both sleek and functional, allowing it to blend seamlessly into any home entertainment setup.

Overall, the NAD 2155 is a versatile, powerful, and well-designed audio receiver that caters to a variety of listening preferences, making it a valuable addition to any audio setup.
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