Soulution Audio 511 stereo amplifier
The Soulution 511 delivers explosive dynamics, deeply articulated bass and a remarkably silent, source-faithful presentation. Phil Gold found its vast soundstage, clean transients and difficult-load authority equally persuasive, making this high-current powerhouse a compelling reference for revealing loudspeakers and large-scale music.
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Deliciously Crispy
Sound Quality
96/100
Build Quality
93/100
Value for Money
89/100
Pros
Exceptionally clean, silent presentation with abundant detail, articulation and instrumental separation.
Uncompressed dynamics and clean transients from delicate passages through full orchestral climaxes.
Fast, fully articulated bass and effortless control of difficult speaker loads.
Large, relaxed image with notable depth and height.
Cons
Balanced XLR inputs only; the review notes the omission of an unbalanced input.
Limited status display and no input-sensitivity adjustment for unusually high- or low-output preamps.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 96/100
The review describes an exceptionally complete presentation, combining detail, articulation, imaging, attack, decay and tonal colour without apparent compromise. It is praised for remaining true to the source, operating silently, and retaining composure from delicate passages to full orchestral climaxes.
Transparency Resolution
97/100
Phil Gold found detail, articulation and instrumental separation in abundance, calling the amplifier as close to perfect as he had heard by his usual listening criteria. With the source paused and volume at maximum, he heard neither hiss nor hum from the speakers, supporting the impression of an exceptionally quiet and clear presentation.
Tonal Balance Musicality
95/100
The 511 is described as true to the source, producing beauty when it is present in the performance rather than imposing a character of its own. The reviewer also praises its orchestral colour and fully articulated bass, suggesting a presentation that is both neutral and richly communicative.
Dynamics
97/100
The amplifier reportedly scales effortlessly from the quietest pianissimo to the climaxes of Mahler's Third Symphony, with no detectable compression. Clean transients, more than ample headroom, fast bass and an ability to drive difficult loads with ease make power delivery a defining strength.
Soundstage Imaging
95/100
Imaging is singled out among the amplifier's major strengths, while comparison listening found a larger image with greater depth and height. The review also notes that individual instruments remained clear within dense orchestral mixes, reinforcing the sense of stable spatial organization.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
The engineering is unusually substantial: four 600VA power supplies, 500,000µF of storage capacitance, heavy copper signal and power paths, and no cooling fan. Its rated output doubles from 150W into 8 ohms to 600W into 2 ohms, while the claimed high-current capability aligns with the reviewer's experience of effortless difficult-load driving.
Value for Money
89/100
At approximately $37,000 to $59,975, the 511 belongs firmly in the cost-no-object amplifier class. The reviewer explicitly considers its price fully commensurate with the performance offered, though it remains a luxury purchase rather than a conventional value-led proposition.
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Manufacturer's Description — Soulution Audio
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.
Verified Dealers
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Authorized dealers for Soulution Audio 511 stereo amplifier
- The Audio Association — in-store — Anaheim, California, United States (website)
- Addicted to Audio — online and in-store — Epping, Victoria, Australia (website)
- Ann Arbor Audio Design — in-store — Ann Arbor, Michigan, United States (website)
- Audiofeel — in-store — Doetinchem, Gelderland, Netherlands (website)
- Creative Audio of Tennessee — online and in-store — Franklin, Tennessee, United States (website)
- Delve Audio — in-store — Caldwell, New Jersey, United States (website)
- Element Acoustics — Canada (website)
- Euphoria Hifi — in-store — Southlake, Texas, United States (website)
- Farnsworth Audio — in-store — Draper, Utah, United States (website)
- Harmony House Audio — in-store — Arlington Heights, Illinois, United States (website)
and 17 more verified dealers