Naim NAIT 5si Integrated Amplifier

The Classic Pure-Analogue Entry Point to High-End Audio

Inspiration drawn from Naim’s iconic original 1983 NAIT amplifier lives on in the Naim NAIT 5si. Operating as the pure analogue entry point into Naim's high-performance component hierarchy, the NAIT 5si delivers the signature drive, timing, and dynamic grip that audiophiles expect from the brand—engineered without digital clutter to focus entirely on signal purity.

Housed in a solid zinc and aluminum chassis with a brushed black finish, the NAIT 5si features a clean front panel layout, a motorized analog volume control, and Naim’s classic illuminated green input buttons.

Engineering & Architecture: High Dynamic Drive & Dedicated Headphone Stage

Under the hood, the NAIT 5si is built around a heavy toroidal transformer and upgraded power supply circuitry delivering 60 Watts per channel into 8 Ohms. With passive preamplifier stages and carefully routed internal wiring to minimize inter-component crosstalk, it drives real-world loudspeaker loads with punchy dynamic transients and rhythmic precision.

Key Performance & Technological Innovations

60W Class A/B Output: Delivers 60W RMS per channel into 8 $\Omega$ (90W into 4 $\Omega$) backed by high transient current reserves.

Dedicated Class A Headphone Stage: Features a front-panel 6.35mm (1/4") headphone output driven by a discrete headphone amplifier stage.

AV Bypass Mode: Includes a selectable AV input mode to integrate the stereo amplifier directly into a home theater setup as the front left/right power stage.

Flexible Analogue Inputs: Equipped with 4 line-level inputs supporting standard RCA connections alongside Naim’s traditional low-noise 5-pin DIN sockets.

Resonant-Damping Enclosure: Extruded aluminum chassis protects sensitive audio circuits from microphonic vibration and external magnetic interference.

Product Specifications

Type: Pure Analogue Integrated Amplifier

Power Output: 60 W RMS per channel into 8 $\Omega$ | 90 W RMS into 4 $\Omega$

Analogue Inputs: 4 x Line Level (2 x 5-pin DIN / RCA pairs, 2 x stereo RCA pairs)

Audio Outputs: 1 x Headphone Jack (6.35mm / 1/4"), 1 x Fixed Line Out (HDD RCA pair)

Input Sensitivity: 170 mV

Input Impedance: 20 k$\Omega$

Power Consumption (Max): 300 VA

Dimensions (W x H x D): 432 mm x 70 mm x 301 mm

Weight: 6.8 kg

What’s in the Box?

1 x Naim NAIT 5si Integrated Amplifier

1 x NARCOM-4 Remote Control (with batteries)

1 x Naim Power-Line Lite Mains Cable

Quick Start & Safety Documentation