Highlights

Design
The audio section of the 311 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 as well as its dedicated power supplies are executed in dual-mono layout for optimal channel separation (> 105 dB) which is key for a three dimensional sound stage.

Amplification
The amplification circuit of the 311 is based on the technology used in our Series 5 amplifiers. Current amplification is done in three stages, each with a narrow, almost linear operating range. The high Class A operation supplemented by more than 160,000 µF of storage capacitance results in a nearly infinite impulse response. 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.

Power supply
A total of six power supplies – optimized for each function – feed the 311 stereo amplifier. Four cutting-edge switched-mode power supplies deliver 1,200 VA of audiophile quality power. They feature high performance filtering at the input and output, and high speed soulution voltage regulators to deliver considerably more stable power than any conventional, transformer-based technology.

Highlights

Philosophy
A preamplifier should only amplify or attenuate the music signal, not change it in any way. No distortion, no hum or noise, at the same time achieving the lowest cross talk and widest bandwidth. The soulution 325 preamplifier elegantly meets these demands.

Layout
Unbalanced design ensures the fewest components in the signal path. Physical separation of the left and right channel provides optimal separation and cross talk performance. High quality relays switch between the inputs. For safety, an audio grade coupling capacitor protects the preamplifier as well as downstream amplifiers and loudspeakers from potential DC-components in source signals..

Volume control
The 325’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 amplifiers, the 325 is equipped with a second volume control with a PGA (Programmable Gain Amplifier). Active only during the volume control process, it is similar to a potentiometer and enables the volume to be adjusted in smooth, click-free steps. As soon as the new desired level value has been selected, the unit returns control to the precision resistors.

Power supply
A switched mode power supply and audiophile DC-DC converters with linear regulator provide the required supply voltages for the 325 preamplifier. Induction of noise is omitted by physical separation from the analog audio boards and effective shielding. Switched mode power supplies provide supply voltages that are more stable and lower in noise than other power supply technologies.

Theater-Mode
The 325 may as well be integrated in an Audio/Video system. One input can be defined as surround input. Volume and balance settings of the 325 preamplifier will be ignored for the surround Input.

Highlights

Philosophy
Most integrated amplifiers combine the functions of volume control, source selection and amplification in single multi-function circuit. Not so the soulution 330 Integrated amplifier. It takes the uncompromising route of separate circuits, combining a dedicated preamplifier, and a dedicated power amplifier in one housing. It is a real soulution product – truly a great amplifier.

Design
The audio section of the 330 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 as well as its dedicated power supplies are executed in dual-mono layout for optimal channel separation (> 105 dB) which is key for a three dimensional sound stage.

Amplification
The amplification circuit of the 330 is based on the technology used in our Series 5 amplifiers. Current amplification is done in three stages, each with a narrow, almost linear operating range. The high Class A operation supplemented by more than 160,000 µF of storage capacitance results in a nearly infinite impulse response. 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.

Power supply
A total of six power supplies – optimized for each function – feed the 330 integrated amplifier. Four cutting-edge switched-mode power supplies deliver 1,200 VA of audiophile quality power. They feature high performance filtering at the input and output, and high speed soulution voltage regulators to deliver considerably more stable power than any conventional, transformer-based technology.

Volume control
The 330’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 330 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.

Theatre mode
Theater mode allows users to optimally integrate the 330 with AV systems. In theatre mode, the input signal by-passes the preamplifier section without any adjustment for volume or balance.

Operation
The 330 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.

Perfect volume control
The 525 owes much to the design of the range-topping soulution 725 Preamplifier. It uses the same volume control which ingeniously combines the smooth fingertip control of variable resistors with the precision and stability of fixed resistor networks. For the 525 we’ve chosen the best performing Vishay Dale resistors with relays of the utmost quality. The end result is volume control that is finely adjustable in 95 steps of 1 dB each, with no perceptible switching clicks. Truly the best of both worlds.

Advanced Switching
Input selection too uses very high-quality relays. The design – which switches ground as well as signal connections – ensures that only the selected input is connected through to the 525 electronics, the remainder being isolated. By buffering all signals immediately after the input, the 525 presents only a minimal load to source devices. Both balanced and unbalanced inputs are available.

Dual-mono construction
As few components as possible in the signal path speak for an unbalanced circuit concept. In this case, the lowest possible stereo conversations can only be achieved with a consequent dual-mono design. The analogue circuits and the associated power supplies of the left and right channels are physically separated from one another and are additionally decoupled with filter networks.

Level and phase correct with all loads
An ideal preamplifier like the 525 maintains perfect level accuracy and phase accuracy regardless of load. But measured values are only part of the story. Ultimate sound quality should always be the first priority. At no time should distortion, noise or hum be allowed to colour the music.

Perfect power
In order to drive the longest of signal cables, the output stage of a preamplifier must be sufficiently power­ful to do the job. The 525 employs a powerful, very fast and ultra-wide (2 MHz/– 3 dB) output stage that can drive long cables with ease. We team that with a similarly robust, high specification switched-mode power supply which features high-precision and extremely low-noise linear control circuits. Backed by more than 400,000 μF of storage, the power supply of the 525 provides virtually unlimited pulse power with indiscern­ible levels of noise.

Audiophile transparency
Musical transparency is pre-eminent in the 525. Colouration is simply not a factor. Control too is at the 525’s heart: stereo imaging precision is exemplary while sound sources appear perfectly focused on the sound stage. Once you audition the 525 you will come to understand the true nature of sound and the importance of the right preamplifier in achieving it.

Highlights

Philosophy
A preamplifier should only amplify or attenuate the music signal, not change it in any way, while meeting the highest technical specifications. No distortion, no hum or noise, at the same time achieving the lowest cross talk and widest bandwidth. The soulution 520 preamplifier elegantly meets these demands and is a benign load for any source component.

Design
Unbalanced design ensures the fewest components in the signal path. Physical separation of the left and right channel provides optimal separation and cross talk performance. High quality relays switch between the inputs. Source signals are buffered directly at the input. For safety, an audio grade coupling capacitor protects the preamplifier as well as downstream amplifiers and loudspeakers from potential DC components in source signals.

Volume control
The 520’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 amplifiers, the 520 is equipped with a second volume control with a PGA (Programmable Gain Amplifier). Active only during the volume control process, it is similar to a potentiometer and enables the volume to be adjusted in smooth, click-free steps. As soon as the new desired level value has been selected, the unit returns control to the precision resistors.

Output stage
Multi-stage, similar to that used in the reference 720 preamplifier, it achieves very fast, ultra wideband (1MHz/-3dB) amplification and is able to drive the longest interconnects with ease.

Phono-MC-Preamplifier
Similar to the 720, the phono preamplifier of the 520 is also multi-stage using the highest grade components.

Operation
The 520 is operated via its 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.

Highlights

Philosophy
Building the ideal phono amplifier is the ultimate challenge for audio designers. It must work with the extremely low signal levels of moving coil (MC) cartridges while achieving low noise, low distortion, high channel separation and maximum linearity. It must provide up to 80dB gain – equivalent to raising the signal level by 10,000 – yet must exhibit level and phase accurate behaviour while adhering strictly to RIAA-IEC equalisation standards.

Design
The soulution 750 (three MC inputs) and 751 (two MC inputs, one MM input) have risen to this design challenge supremely well. Based on an advanced design around an ultra wide band (1 MHz/– 3 dB) multi-stage amplifier, both are built with the very highest quality components.

For all inputs the gain factor and the terminating impedance are freely selectable. The working bandwidth may also be chosen from either Low (200 KHz) or High (1 MHz) to within – 3 dB. To suppress rumble from warped records there is an IEC subsonic filter (< 20 Hz) which will protect loudspeakers against hazardous cone excursions. On the 750/751 there is also a key to select mono operation.

A front panel level control allows sound level balancing across the three inputs.

Highlights

Philosophy
A CD or SACD player brings both digital and analogue domains into an audio system. For the very highest quality sound every part of the player is critical. A high-quality D/A converter alone is no longer enough. The 746 unites a top quality optical drive, a super-precise master clock generator, an intelligent digital signal processor with over­sampling, and analogue output stages of the utmost quality. Together they ensure nothing in the music is lost on its way from disc to output connection.

Design
Look inside many CD/SACD players and you’ll find a lot of empty space and off the shelf electronics. soulution’s approach is somewhat different. As with our other components we’ve engineered our own circuitry and used a consistent dual mono layout throughout. Three separate power supplies – for drive, digital and analogue stages – are moved offboard into an external housing, removing a potential source of interference.

Transport
Drive quality is critical in a high-end player. For the 746 we chose the Esoteric synchromesh drive from Teac. It is mounted to massive copper chassis which are in turn affixed with damped mountings for complete mechanical isolation.

Due to the new power supply technology the 725 preamplifier has an even more breathtaking three-dimensional sound quality than its predecessor the 720 already did. Unsurpassed wealth of detail. Incredible punch at low frequencies. Distortions and noise could be reduced even further. The preamplifier is the command centre of your high fidelity chain. In tests its sound quality has proved to be second to none.

New power supply technology
The 725’s totally redesigned power supply unit works even more precise and regulates more precise and faster than the power supply of the 720. With more than 500,000 µFarad of storage capacitance it provides almost unlimited impulse current for the analog circuits.

Higher precision, even more stability and velocity…
… than already has been achieved with the soulution 710 stereoamplifier, seems to be im­possible. Still, the new soulution 711 significantly out­per­forms its prede­cessor in all disciplines! The new “switched mode” power supply technology brings the soulution 711 to new level of per­formance. Improve­ments on the test bench get confirmed by the performance in the listening room. Words alone cannot convey the per­for­mance and sheer acoustic presence of the soulution 711 stereo­amplifier. We’ve combined the ultimate technical specification and highest possible performance with just one aim – to liberate the best the music has to offer. Listen like never before. Marvel. Enjoy. Without limits.

Key Features

• Audio grade “Switched Mode” power supply (4 × 600 VA )
• More than 1,000,000 µFarad storage capacity in the power supply unit
• Peak current rating of more than 120 Ampere
• Impulse power rating > 6’000 Watt

More power, more control and even lower distortion.
Supported by the new “switched mode” power supply technology the soulution 701 mono­amplifier sets new standards in for uncompromising music reproduction and out­classes its predecessor the soulution 700 by far. Colossal power and breath taking performance. Never has an amplifier been so close to perfection, but at the same time the technology must be subordinate – and transparent – to the music. Letting you experience music in all its natural diversity and beauty.

Key features:

• Audio grade “switched mode” power supply (4 × 600 VA )
• More than 1,000,000 µFarad storage capacity in the power supply unit
• Peak current rating of more than 120 Ampere
• Impulse power rating > 12,000 Watt