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Soulution Audio 511 stereo amplifier
Precision, stability and velocity…
… 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)
Highlights
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.
AmplificationThe 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.
Safety
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.
Operation
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.
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Soulution Audio 511 stereo amplifier — iron‑clad control, velvety musicality
The Soulution 511 stereo amplifier couples prodigious current delivery with delicate musical finesse, delivering exceptional dynamics, resolution and a wide, well‑defined soundstage. As tested by Phil Gold -- Enjoy the Music.com, the 511 scales effortlessly from the quietest pianissimo to orchestra‑level climaxes without audible compression, while preserving fast, articulate bass and uncolored treble.
Technically the design relies on ultra‑wide bandwidth circuitry, fast switching power architecture, massive copper bus‑bars and a 500,000 µF power reservoir, enabling fanless operation and an almost silent noise floor. That combination makes the 511 ideal for demanding speakers and reference systems where transparency, imaging and headroom matter. At its premium price the 511 rewards listeners seeking flagship‑class performance and long‑term system compatibility.
Pros
- Exceptional dynamics and headroom that scale from the quietest pianissimo to large orchestral climaxes without audible compression.
- High-resolution, neutral presentation with strong imaging and low noise — audible detail, clarity and life‑like instrument placement.
- Robust build and power architecture (copper bus‑bars, fast switched supplies and a 500,000 µF reservoir) enabling fanless, quiet operation and the ability to drive difficult loads.
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Cons
- No unbalanced (RCA) input and an internally converted balanced path — limits connectivity flexibility for some legacy systems.
- Missing convenient usability features noted by the reviewer (no sensitivity switch and limited front‑panel status text).
Sound Quality
93/100
Dynamics
94/100
Reviewer repeatedly praises the 511's headroom and transient authority: "scales all the way from the quietest pianissimo to the powerful climaxes... I could not detect the slightest evidence of compression." The amp's published ratings (150 W/ch into 8 Ω, 300 W/ch into 4 Ω, 600 W/ch into 2 Ω) plus a massive power supply and >500,000 µF storage support effortless current delivery and slam, and the reviewer notes it "drives almost any load with ease." Overall the impressions align with an exceptional dynamics performance for a high-power Class‑AB (100–200 W class) stereo amplifier.
Soundstage Imaging
92/100
Imaging and scale are specifically praised: the amp "feels more relaxed and throws a bigger image with both greater depth and height," and the reviewer notes clear placement of instruments in the mix even at extreme dynamics. The 511 preserves channel separation and spatial cues while delivering authority, supporting a top-tier imaging score.
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Build Quality
94/100
Internals are described as robust and thoughtfully executed: "copper bars and massive copper traces... instead of wires and connectors," four 600 VA power supplies and a massive 500,000 µF storage capacitance. The amplifier runs without a cooling fan due to reduced idle current, and the reviewer highlights the heavy-duty power-supply architecture—all evidence of exceptional construction and thermal/power management.
Value for Money
90/100
At the stated price (~$41,975) the reviewer explicitly says the cost is "fully commensurate with the performance level on offer." Given the amp's rated power (150 W/ch into 8 Ω, 300 W/ch into 4 Ω, 600 W/ch into 2 Ω), its very large 500,000 µF supply and measured/listening performance, this represents a justified premium in the $30k–$50k high-end amplifier segment. Review language supports a "justified premium" conclusion rather than bargain/value superlatives.
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