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Soulution 331 integrated amplifier

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The Soulution 331 integrated amplifier delivers exceptional sonic performance through a philosophy of dedicated circuit separation rather than multi-function compromise. Four advanced switched-mode power supplies provide 1,200 VA continuous output with peak capability exceeding 4,200 VA, ensuring superior stability compared to conventional transformer-based designs. The three-stage power amplifier employs technology from Soulution's Series 5 line, while the preamplifier features relay-switched precision metal foil resistors in an 80-step volume control with intelligent click-free adjustment circuitry. Extended bandwidth exceeding 2MHz significantly minimizes phase shift across the audio spectrum. Optional phono and DAC modules add versatility—the phono stage offers adjustable MC cartridge impedance matching with 60dB gain, while the DAC accepts multiple digital formats and employs zeroPhase processing with custom passive reconstruction filtering. Intuitive front panel controls and display enable complete system optimization.

Specifications

Mains 100 – 240 V (50 – 60 Hz)
Power consumption < 0.5 W Standby
idle 110W
Analog inputs 2 × balanced (XLR)
2 × unbalanced (RCA)
Input impedance  5.8 kΩ balanced (XLR)
4.9 kΩ unbalanced (RCA)
Phono input (optional)
- Termination impedance
1 × unbalanced (RCA)
20-1260 Ω
Digital inputs (optional) 1 × AES/EBU
1 × SPDIF
1 × USB
1 × Network
LINK (remote turn-on) 2 x phone jack (3.5mm)
Pre-Out 1 x balanced (XLR)
Loudspeaker 2 pair loudspeaker binding posts
Power output 100 W @ 8 Ω
200 W @ 4 Ω
400 W @ 2 Ω (< 5 sec.)
Output current max 30 A
Gain line inputs – 53 to + 26 dB
Gain phono input +17 to + 96 dB
Frequency response (– 3 dB) 0 – 800 kHz
Phase shift @ 20kHz < -3°
THD < 0.0005%
Spot noise (input related) < -140 dBV/√Hz
Damping factor > 5,000
Dimensions (WxDxH) 430 x 490 x 142 mm
Weight ~18 kg

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