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Soulution 725 preamplifier

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The Soulution 725 preamplifier elevates analog reproduction through advanced power supply architecture that surpasses its acclaimed 720 predecessor. Its redesigned power delivery system—featuring over 500,000 µFarad of storage capacitance—enables exceptional three-dimensional soundstaging, refined detail retrieval, and commanding low-frequency authority while minimizing distortion and noise. The dual-mono signal path employs precision metal foil resistors for volume control and relay-based input selection, maintaining maximum channel separation and virtually eliminating crosstalk. An optional phono MC stage delivers up to 80dB gain with ultra-wideband performance adhering to RIAA-IEC standards. Dedicated power supplies isolate audio and digital circuits, while the multi-stage output amplification—comparable to the 711 power amplifier—drives extended interconnects with authority. Intuitive front-panel operation and comprehensive system-matching functions complete this reference-grade control center for discerning audiophiles.

 

Specifications

Mains 220 – 240 V (50 – 60 Hz)
100 – 120 V (50 – 60 Hz)
Power consumption < 0.5 W standby
60 W device in operation
Inputs 2 × balanced (XLR)
3 × unbalanced (RCA)
1 × Phono-MC (optional)
Input impedance 2 kΩ balanced (XLR)
47 kΩ unbalanced(RCA)
10 – 1000 Ω (adjustable)
Outputs 1 × balanced (XLR)
1 × unbalanced (RCA)
Frequency response (– 3 dB) 0 – 1 MHz
THD + N < 0.00009% (20 Hz – 20 kHz)
Signal-to-noise ratio > 140 dB
Channel separation > 110 dB
Gain + 9.5 dB balanced (XLR)
+ 3.5 dB unbalanced (RCA)
+ 54/60 dB Phono-MC unbalanced (optional)
plus gain adaption + 3/+ 6/+ 9 dB
Volume control range 0 to – 79 dB in 1 dB steps
Output impedance 2 Ω balanced (XLR)
2 Ω unbalanced (RCA)
Output voltage 16 VRMS balanced (XLR)
8 VRMS unbalanced (RCA)
Output current max 1 A (limited by protection circuit)
Dimensions 480 × 167 × 450 mm
Weight approx. 30 kg
LINK (remote turn-on) 12 V control signal

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