Naim Audio NAC 332

The NAC 332 embodies Naim Audio’s approach to analog preamplification. Part of the new “New Classic” series, it features a versatile design and an architecture inspired by the Statement S1 preamplifier. Designed for users attentive to sound quality, the NAC 332 combines balanced musical reproduction with exceptional clarity. It offers extensive connectivity, including a headphone output, multiple inputs, and compatibility with the NVC TT phono preamplifier, making it a central component for many audio systems.

Naim Heritage and Sound Philosophy

The NAC 332 follows in the footsteps of Naim’s legendary preamplifiers while marking a significant evolution. Under the guidance of the brand’s Technical Director, engineers have developed specific electronic circuits to deliver superior performance. The NAC 332 reconnects with Naim’s signature sound—dynamic, engaging, and deeply involving—while adding greater resolution and transparency.

This distinctive sonic approach results in a remarkable ability to deconstruct music and reveal how its different elements interlock. Each instrument benefits from increased definition, making it easy to follow individual lines in complex arrangements. Listening tests reveal that the piano has superior richness and timbre, while subtle electric guitar patterns gain in definition.

Compared to previous models, the NAC 332 represents a significant step forward. On its own, it already surpasses the NAC 82 combined with a HiCap power supply. When paired with the external NPX 300 power supply, its performance even exceeds that of the NAC 252-SuperCap combination, with a smoother, richer, and more refined presentation.

Innovative Technical Architecture

At the heart of the NAC 332 is a volume control architecture directly inspired by the Statement S1, Naim’s reference preamplifier. This system uses Reed relays for resistance switching, delivering the superior sound quality of fixed-resistor volume controls while ensuring precise channel balance.

The electrically controlled optical encoder features a precision ball bearing for exceptionally smooth rotation. This “fly-by-wire” approach eliminates the noise and degradation issues associated with traditional potentiometers.

The discrete Class A balanced input circuits use two asymmetric buffers (one for the “hot” signal, one for the “cold”) feeding a discrete Class A operational amplifier. The Class A asymmetric transistor input buffers and filtering circuits use hand-soldered polystyrene capacitors, specially designed for ultra-low dielectric absorption.

The NAC 332 incorporates two separate power supplies: a high-quality audiophile linear supply based on a large toroidal transformer for the audio circuits, and a highly efficient switching supply allowing for just 0.5W consumption in standby mode. Galvanic isolation between the control and audio circuits ensures maximum signal integrity.

Unprecedented Connectivity and Versatility

The NAC 332 stands out as the most versatile preamplifier ever designed by Naim. Its front panel features a 6.35 mm headphone jack powered by a discrete Class A/AB 1.5W amplifier—a first for a Naim preamplifier.

The wealth of rear connections allows the NAC 332 to be integrated into virtually any audio system. It offers eight configurable inputs across various connector types: 2 pairs of balanced XLR (100kΩ), 3 pairs of RCA (47kΩ), 2 five-pin DIN, and 1 eight-pin DIN. The latter provides +/-18V power compatible with the NVC TT phono preamplifier for outstanding vinyl playback.

Outputs are available in both balanced XLR and RCA, allowing connection to any power amplifier. A second pair of RCA outputs facilitates bi-amplification or connection to a subwoofer. This connection flexibility makes it easy to integrate the NAC 332 into systems using equipment from other manufacturers.

Each input is fully configurable: sensitivity, AV bypass mode, and assignment of input sockets to the front panel buttons. This advanced customization allows you to precisely tailor the NAC 332 to your system and sources.

Listening Experience and Sound Performance

The NAC 332 excels in two areas that are traditionally difficult to reconcile: rhythmic precision and transparency. Naim preamplifiers have always been recognized for their ability to faithfully reproduce musical timing, and the NAC 332 is no exception. However, it adds a level of transparency and detail revelation usually associated with other high-end brands.

This unique combination results from considerable efforts to minimize vibration and electrical noise. The result is a significant reduction in mechanical disturbances and high-frequency electrical interference compared to previous Classic models.

In practice, this translates into a soundstage where rhythms are perfectly articulated while revealing the subtlest sounds that give each performance its depth and naturalness. Listening tests reveal a notable improvement in dynamics and a rhythmic precision that goes from excellent to spectacular.

Adding the external NPX 300 power supply further elevates the NAC 332’s performance, bringing a richer tonality and smoother, more fluid highs. This improvement is especially noticeable on complex passages where the standalone NAC 332 can occasionally tend toward a certain harshness.

Integration into a Naim Ecosystem

The NAC 332 reveals its full potential when integrated into a complete Naim system. It communicates wirelessly in both directions with the NSS 333 network player via ZigBee technology, allowing unified control through the Focal & Naim app.

The bidirectional ZigBee RF remote control does not require direct line of sight and displays real-time volume changes. 3.5 mm optical connections allow for synchronized standby and lighting with compatible power amplifiers such as the NAP 350.

Paired with NAP 350 monoblocks, the NAC 332 offers improved dynamics, better bass foundation, and greater ease. Listening tests reveal that percussion hits harder, while toms and bass guitar gain solidity. The bass becomes more tangible and present.

For optimal performance, Naim recommends using DIN connections rather than XLR for standard cable lengths, despite the presence of both connector types. This preference is confirmed by listening tests.

Technical Specifications

Audio Performance

• Innovative electronic circuits and audiophile-grade components
• Through-hole resistors for precise volume control
• Volume control inspired by the Naim Statement (Reed relays for switching)
• Input sensitivity and maximum volume adjustment
• Analog gain: preamplifier at maximum volume: 15.5 dB
• Frequency response: line 3 Hz to 40 kHz -3 dB
• Signal-to-noise ratio: line 104 dB ref 2.2 V A-weighted, volume at 0 dB
• Distortion:
  • Line: 0.003% @ 2.2 V input, volume at 0 dB, 1 kHz
  • Line: 0.018% @ 2.2 V input, volume at 0 dB, 20 kHz
• Crosstalk:
  • Line: 90 dB 1 kHz, volume at 0 dB
  • Line: 70 dB, 20 kHz, volume at 0 dB

Technical Architecture

• Statement volume knob architecture using Reed relays for precise channel balance
• Ultra-smooth optical encoder with electric controls and precision ball bearing
• Reed relay input switching
• Discrete class A balanced input circuits via two class A unbalanced buffers
• Asymmetric class A transistor with buffers and filter circuit
• Hand-soldered polystyrene capacitors
• Configurable inputs: pre-set input sensitivity, name, AV bypass mode, and deactivation of unused inputs
• Two internal power supplies:
  • One high-quality linear type based on a large toroidal transformer
  • One for 0.5 W power consumption in standby
• Galvanic isolation of control and audio circuits

Design and Construction

• Sleek, contemporary design
• Premium materials
• Mechanical volume control with precision ball bearing
• Adjustable brightness logo
• Aluminum chassis used for its anti-vibration, thermal, and magnetic properties
• Protection of sensitive components for optimal sound quality

Connectivity

• 8 configurable inputs: balanced XLR, DIN, RCA
• Powered DIN socket for NVC TT phono stage
• 6.35 mm front headphone jack with 1.5 W headphone amplifier
• Paired XLR and RCA outputs for connection to any power amplifier
• Analog inputs:
  • 1 x 8-pin DIN (47 kΩ, 2.2 V typical, 9.5 Vrms max)
  • 2 x 5-pin DIN (47 kΩ, 2.2 V typical, 9.5 Vrms max)
  • 3 x RCA pairs (47 kΩ, 2.2 V typical, 9.5 Vrms max)
  • 2 x XLR pairs (100 kΩ, 2.2 V typical, 9.5 V max)
  • 8-pin DIN compatible with 5-pin DIN
  • 8-pin DIN +/-18 V (compatible with phono stages, see NVC TT)
• Analog outputs:
  • 1 x XLR pair (balanced 10 Vrms max)
  • 1 x RCA pair (10 Vrms max)
  • 1 x 6.35 mm jack for headphone output (1.5 W at 16 Ω)
• 1 x USB port for updates

Physical Specifications

• Power consumption in standard use: 20 W
• Power consumption in network standby: <2 W
• Power consumption in standby: <0.5 W
• Mains voltage: 115 V or 230 V, 50 / 60 Hz
• Dimensions (H x W x D): 9.15 x 43.2 x 31.75 cm
• Weight: 11 kg

Communication and Control

• Bidirectional wireless connection with the NSS 333
• Optical synchronization with NAP 350 amplifiers and New Classic range
• Bi-directional ZigBee RF remote control with volume change display
• 3.5 mm optical connection for synchronized standby and lighting, compatible with power amplifiers
• Upgradable with NPX 300 via two Burndy cables (one digital and one analog)