Pro-Ject Amp Box S3 CI silver

Pro-Ject Amp Box S3 CI: The Compact and High-Performance Power Amplifier

The Pro-Ject Amp Box S3 CI is an ultra-compact stereo power amplifier that delivers astonishing performance despite its small size. With dimensions of just 103 x 36 x 112 mm and a lightweight of 380 g, it easily fits into the tightest spaces. This amplifier is the perfect companion for small bookshelf speakers and portable audio systems.

Despite its reduced size, the Amp Box S3 CI doesn’t compromise on power. It can deliver 2 x 20 W at 8 Ω and up to 2 x 37 W at 4 ohms, providing dynamic and authoritative sound for most compact speakers on the market. Its switching power supply offers excellent efficiency while minimizing its footprint.

Precise and Dynamic Sound

In terms of sound, the Amp Box S3 CI stands out for its high precision and dynamics. The soundstage is wide and stable with impressive depth. The tones are accurate and natural, without noticeable coloration. Airiness and clarity are present, even in the densest passages.

This amplifier is quick and responsive when needed. Note attacks are crisp, and the rhythmic message is conveyed with conviction. The bass is deep, tight, and perfectly defined. The level of detail is high, allowing subtle nuances to be heard.

Unbeatable Performance-to-Size Ratio

With its compactness and performance, the Amp Box S3 CI establishes itself as a benchmark in the mini power amplifier market. It is suitable for music lovers looking to assemble a discreet and affordable hi-fi system, as well as those seeking a secondary amplifier to power an additional room. Its excellent value for money will appeal to a wide audience.

Easy to integrate, simple to use, and capable of high performance, this amplifier encapsulates Pro-Ject’s expertise in an ultra-compact format. It continues the brand’s minimalist and rational approach without any compromise on sound quality. A model to discover urgently!

Does it have an automatic standby feature?

Yes, the Amp Box S3 CI is equipped with an automatic standby circuit that activates after about 20 minutes without an input signal. This feature helps reduce power consumption in case of forgetfulness. It can be enabled/disabled via a switch on the rear panel.

What amplification technologies are used?

The power stage of the Amp Box S3 CI uses two latest-generation TDA7498 integrated circuits, one per channel. This chip operates in class D with PWM modulation for excellent efficiency. The power supply uses an oversized toroidal transformer and generous filtering capacitors for a significant current reserve.

Technical Specifications

Installation and Design

• Professional custom installation solution
• Ultra-compact with anti-vibration/interference metal casing
• Finishes available in silver, black
• European manufacturing

Audio Performance

• Advanced audiophile amplification module
• Output power: 2 × 20 W (8 Ω), 2 × 37 W (4 Ω)
• Peak power: 2 × 50 W (4 Ω)
• Total harmonic distortion and noise (THD+N): < 0.03% at 5 W
• Signal-to-noise ratio: 88 dBV, 95 dBV A-weighted
• Channel separation: - 68 dB at 10 kHz
• Gain: 37 dB (maximum level)
• Input impedance: 10 kΩ

Frequency Response

• Bass (20 Hz): variable equalization ± 11 dB
• Treble (20 kHz): variable equalization ± 5 dB

Connectivity

• Stereo RCA inputs/outputs
• Trigger input/output
• 12 V DC trigger (2.5 mm 2-pole jack connector)
• Professional connectors
• Serial interface (RS232)

Features

• Automatic signal detection
• Automatic standby/power-on
• Settings: level, bass, treble
• Control via serial interface (RS232)

Physical Characteristics

• Dimensions: 103 × 36 × 112 mm (including connectors)
• Weight: 380 g (without adapter)
• Power supply: 20-24 V / 3 A DC (universal power adapter)