Soulution 511 STEREO

Stereo/power amplifier
Stereo: 2 × 150 W @ 8 Ω 2 × 300 W @ 4 Ω 2 × 600 W @ 2 Ω Mono: 600 W @ 8 Ω 1200 W @ 4 Ω 2000 W @ 2 Ω Pulse power: Stereo 2 × 2000 W Mono 4500 W
1 × balanced (XLR)
2 pairs Cu-terminal, gold plated
+ 26 dB Stereo / +36 dB Mono
Frequency Response:
Stereo 0 – 800 kHz; Mono 0 – 1.6 MHz
less than 0.5 W standby idle 200 W max 2000 W
Stereo less 0.001% at 50 W @ 4 Ω (20 Hz – 20 kHz); Mono 0.001% at 200 W @ 4 Ω (20 Hz – 20 kHz)
Signal to noise ratio:
108 dB (5 W @ 1 kHz)
Channel separation:
more 120 dB @ 1 kHz
Imput impedance:
2 kΩ balanced (XLR)
Damping factor:
Stereo more than 10,000; Mono more than 5,000
442 × 270 × 448 mm (W × H × D)

33 600,00€

About product

… just a razor-thin fraction behind our reference designs of Series 7, this was the design goal we have set for the 511 stereo amplifier. The 511 is equipped with the same “switched-mode” power supply technology, optimized for audiophile applications, as our series7 products. Additionally it is optimized for shortest “signal paths” for the music signal but as well for shortest paths and optimal flow of the current supplying the amplifier stages. Get inspired by the uncompromising music playback and enjoy the diversity and natural beauty of the music. A sound experience, of which everyone will be enchanted. Convince yourself. 

Key Features

  • “Switched-mode” power supply (4 x 600 VA) optimized for use in audio amplifiers
  • more than 500’000 µFarad of storage capacitance in the power supply
  • Peak current rating of more than 60 A
  • versatile: stereo-, mono- und dual-mode
  • Impulse power rating  3’000 Watt (stereo/dual),  6’000 Watt (mono)


Operating modes
The 511 stereo-amplifier can be used in three different setups:

  • Stereo-mode: 140 W 8 Ω, 280W  4 Ω, 560W  2 Ω per channel
  • Dual-mode: 140 W  8 Ω, 280W  4 Ω, 560W  2 Ω per channel
  • Mono-mode: 560 W  8 Ω, 1’120 W  4 Ω, 2’000 W  2 Ω

The operating mode can be changed in the menu functions of the 511 stereo amplifier.

The amplification circuit similar to the technology used for the 711 and 701 amplifiers. At its core is a proprietary voltage amplification stage that consists of linearized amplifiers operating up to a cut-off frequency of 80 MHz. Current amplification is done in three stages, each using a very small and thus almost linear operating range. The high Class A operation supplemented by 500,000 µF of storage capacitance in the power supply 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 511 stereo amplifier is available to drive the speaker. This ensures the 511 does not get the plaything of the  loudspeakers, but controls them with the appropriate precision, power and velocity asked for by the music signal. 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.

Power supply
A total of 10 power supplies – optimized for each function – feed the 511 stereo amplifier. Circuitry that does not process audio signals should not be able to influence them. Therefore those supplying the digital and audio circuits are electrically isolated from each other by optocouplers. Four cutting-edge switched-mode power supplies combined with more than 500’000 µFarad of storage capacitance deliver 2,400W of audiophile quality power. They feature high performance filtering at the input and output, and six linear, high speed, ultra low noise voltage regulators to deliver considerably more stable power than any conventional, transformer-based technology.

Control circuits that protect the 511 stereo amplifier 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. In case a malfunction is detected the 511 stereo-amplifier is muted and will automatically power down.

The 511 stereo amplifier is operated via push buttons and a rotary control on the front panel. It can be switched on remotely with other soulution devices via the LINK system.

About brand


Soulution is owned by the Spemot corporation, a company located in the Swiss town of Dulliken. Spemot is a well-established designer and producer of electronic devices and electric motors used in automotive and other applications including professional catering equipment. The company has a strong track record in innovative bespoke solutions that meet specific customer needs.

The soulution brand for premium audio was created by Spemot’s two managing directors Cyrill Hammer and Roland Manz, both of them passionate high-end audio hobbyists. The pair are long-time Swiss distributors of the Hi-Fi & Records magazine. Having owned and heard top amplifiers produced by US and Japanese manufacturers, they resolved to lay down a challenge and build a family of audio products that would set a new and even higher benchmark.

As reviews of soulution products by audio magazines around the world testify, Hammer and Manz have achieved their goal.


The outstanding sound qualities of the soulution products should also be supported by the design of housing, both visually and by their construction. Due to their size it was clear that they must integrate optimally into a listening/living room to be enjoyed not just for their sonic beauty but as well for their visual appearance. The development of the housing design was therefore carried out with the same care and professionalism as the development of the electronics. Several proposals were made which fulfilled both the technical requirements for stability and heat dissipation, as well as the design requirements.

Design Awards

The effort has paid off. The soulution products were awarded several times for its timeless and elegant design by international design juries.

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