Selling my complete audio system as I move back to Europe following 6 years in NYC, comprising of Soulution 530 integrated amp, Soulution 541 cd/sacd player/DAC and Soulution 560 DAC. Lumin U1 server, Audience aR6-TSSOX, Simon Yorke S10 turntable, Stenheim Alumine 3 (first edition with matching subs) and Nordost Valhalla 2 speaker cables.
This ad is for the Soulution 530 Integrated Amp with phono stage.  I have owned and enjoyed many high end audio systems all with pre and power amplifiers from manufacturers such as Krell, and Nagra but this 'one box' soulution beats them all hands down with transparency, power, silenced wonderful musicality.
A masterpiece:

An uncompromising preamplifier and an uncompromising power amplifier, both of reference quality, combined in one housing. That is the way we at soulution understand the concept of an integrated amplifier. Enjoy the purity and power this music machine is able to deliver.

Highlights

Philosophy
Most integrated amplifiers combine the functions of volume control, source selection and amplification in single multi-function circuit.

Not so the soulution 530 Integrated amplifier. It takes the uncompromising route of separate circuits, combining a dedicated reference quality preamplifier, and a dedicated reference quality power amplifier in one housing.

It is a real soulution product – truly a great amplifier.

Design
The audio section of the 530 is physically separated from the power supply and digital circuits. In order to reduce interferences to a minimum, these sections are additionally shielded. The power amplifier section is executed in dual-mono layout. The left and right audio channels have their own respective identical boards to deliver a channel separation of >110dB for a three dimensional sound stage.

Amplification
The amplification circuit of the 530 is based on the technology of the 710 and 700 amplifiers. At its core is an innovative voltage amplification stage that consists of linearized amplifiers operating up to a cutoff frequency of 80MHz.

Current amplification is done in three stages, each with a narrow, almost linear operating range. The high Class A operation supplemented by 47,000µF of storage capacitance results in a nearly infinite impulse response. Massive copper bars on the amplifier board and to the speaker terminals ensure that all the power of the 530 is available to drive the speaker.

High-precision idle current management ensures optimal Class A operation for all conditions, without requiring any readjustment in the music signal. Optimal sound is thereby guaranteed immediately from switch on. Control circuits that protect against RF or DC signals at the input, and short circuits at the output ensure safe operation in all situations. The input level is also monitored continuously.

Power supply
A total of nine power supplies – optimized for each function – feed the 530 integrated amplifier. Those supplying the digital and audio circuits are electrically isolated from each other by optocouplers and transformers. Four cutting-edge switched-mode power supplies deliver 2,400W of audiophile quality power. They feature high performance filtering at the input and output, and six high speed soulution voltage regulators to deliver considerably more stable power than any conventional, transformer-based technology.

Volume control
The 530’s volume control uses only high-precision, low-noise metal foil resistors, and it controls both the volume and balance. To block switching peaks during volume changes which may be hazardous to power amps, the 530 is equipped with a second volume control with PGA (Programmable Gain Amplifier). Active only during the volume control process, it is similar to a potentiometer and enables the volume to be adjusted smoothly without clicks. As soon as the new desired level value has been selected, the unit returns control to the precision resistors.

Pre-Out
The soulution 530 integrated amplifier is equipped with pre-out connections which enable subwoofers, tape recorders or other amplifiers to be driven directly by the 530’s preamplifier section, by-passing the power amplifier section.

Surround mode
Surround mode allows users to optimally integrate the 530 with AV systems. In surround mode, the input signal by-passes the preamplifier section without any adjustment for volume or balance .

Operation
The 530 integrated amplifier is operated via its three front panel buttons and rotary control. Multi-functional, these allow optimisation of the entire audio system, and an ideal set-up of the individual components. All operating modes are indicated on the clear display.

Specifications

Mains220 – 240 V (50 – 60 Hz) 
100 – 120 V (50 – 60 Hz)Power consumption< 0.5 W Standby 
idle 150 W 
max 1600 WOutputs2 pairs Cu-terminal, 
gold platedGain– 31 dB bis + 42 dBPower output125 W @ 8 Ω 
250 W @ 4 Ω 
500 W @ 2 ΩPulse power> 5,000 WFrequency response (– 3 dB)0 – 800 kHzTHD + N< 0.001% at 50 W @ 4 Ω 
(20 Hz – 20 kHz)IM distortions< 0.005 % SMPTE 
< 0.0006 CCIRSignal-to-noise ratio> 120 dB (5 W @ 1 kHz)Channel separation> 110 dB @ 1 kHzDamping factor> 10 000Output current max45 A (limited)Inputs2 × balanced (XLR) 
2 × unbalanced (RCA) 
1 × Phono (RCA)Input impedance 3 kΩ balanced (XLR) 
3 kΩ unbalanced (RCA) 
Phono configurableDimensions 442 × 350 × 448 mm 
(W × H × D)Weightapprox. 40 kgLINK (remote turn-on)12 V control signal