Soulution Audio 331 integrated amplifier
The Soulution Audio 331 integrated amplifier brings exceptionally low-noise clarity, natural tonal balance and commanding speaker control to a luxurious one-box system. The Absolute Sound heard spacious, textured, deeply realistic playback, while SoundStage Solo praised its intimate musical connection, composed dynamics and ability to drive demanding loads without strain.
WATT RECOMMENDS
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Deliciously Crispy
Sound Quality
93/100
Build Quality
86/100
Features Connectivity
93/100
Value for Money
85/100
Pros
Delivers a quiet, airy, dimensional presentation with natural voices, fine micro-detail and convincing instrumental texture.
Combines strong grip and headroom with effortless control of demanding loudspeaker loads.
Creates an engaging, intimate musical presentation while preserving dynamic impact, bass definition and image stability.
Cons
The multifunction remote is comprehensive but was not especially intuitive beyond basic operation.
Optional phono and DAC capability adds significant cost to an already premium-priced amplifier.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 93/100
The 331 is described as exceptionally stable, controlled and natural, favouring evenness and purity over overt sonic embellishment. The review also reports strong speaker control, a notably expanded stereo presentation and a refined but expressive character.
Transparency Resolution
92/100
HiFi.nl characterises the presentation as controlled, refined and pure, with greater insight into what the musicians are doing when using the balanced inputs. Its stable, unforced delivery suggests a highly clean and resolved window onto recordings.
Tonal Balance Musicality
93/100
The review praises an outstanding balance from treble through bass and repeatedly describes the sound as natural, even and free of artificial embellishment. This appears to be a poised, neutral-leaning amplifier that remains engaging through its expressiveness rather than added coloration.
Dynamics
93/100
Although fundamentally refined in character, the 331 is said to be able to "show its teeth" when the music demands it. It drove the reviewer's speakers with effortless ease, while its broad speaker compatibility and strong control were especially impressive.
Soundstage Imaging
93/100
With balanced connection, the reviewer heard a substantially larger stereo image extending well beyond the loudspeakers. That change also brought greater insight into performers' actions and more pronounced musical expression.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
86/100
The 331 shares Soulution's elegantly rounded aluminium enclosure, with substantial dimensions and an 18 kg specified weight. The supplied review material confirms the premium casework but says little about long-term durability, internal workmanship or serviceability.
Features Connectivity
93/100
The standard analogue provision includes two balanced XLR and two RCA inputs, balanced pre-out, and two pairs of speaker binding posts. Optional modules add phono capability and a DAC section with AES/EBU, SPDIF, USB and network inputs, making the 331 adaptable to both analogue-focused and digitally based systems.
Value for Money
85/100
HiFi.nl lists the 331 at €29,990, placing it firmly in the high-end integrated-amplifier market. The review is highly positive about its performance, but does not directly assess whether it is especially compelling against similarly priced alternatives.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
Online Reviews & Mentions
YouTube Reviews
Forum Mentions
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Specifications
- Mains
- 100 – 240 V (50 – 60 Hz)
- Power consumption
- < 0.5 W Standby idle 110W
- Analog inputs
- 2 × balanced (XLR) 2 × unbalanced (RCA)
- Input impedance
- 5.8 kΩ balanced (XLR) 4.9 kΩ unbalanced (RCA)
- Phono input (optional) - Termination impedance
- 1 × unbalanced (RCA) 20-1260 Ω
- Digital inputs (optional)
- 1 × AES/EBU 1 × SPDIF 1 × USB 1 × Network
- LINK (remote turn-on)
- 2 x phone jack (3.5mm)
- Pre-Out
- 1 x balanced (XLR)
- Loudspeaker
- 2 pair loudspeaker binding posts
- Power output
- 100 W @ 8 Ω 200 W @ 4 Ω 400 W @ 2 Ω (< 5 sec.)
- Output current max
- 30 A
- Gain line inputs
- – 53 to + 26 dB
- Gain phono input
- +17 to + 96 dB
- Frequency response (– 3 dB)
- 0 – 800 kHz
- Phase shift @ 20kHz
- < -3°
- THD
- < 0.0005%
- Spot noise (input related)
- < -140 dBV/√Hz
- Damping factor
- > 5,000
- Dimensions (WxDxH)
- 430 x 490 x 142 mm
- Weight
- ~18 kg
Manufacturer's Description — Soulution Audio
More power reserves and less phase shift in the audioband make the 331 sound even more lifelike than its predecessor.
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 331 Integrated amplifier. It takes the uncompromising route of separate circuits, combining a dedicated preamplifier, a dedicated power amplifier, a first class phono stage and an exquisite D/A-converter in one housing. It is a real soulution product – truly a great amplifier.
New power supply
Four new cutting-edge switched-mode power supplies modules deliver 1,200 VA of continuous power for the power amplfier section with a peak power capability of up to 4’200 VA for more than 5 seconds. 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.
Power amplifier
The amplification circuit of the 331 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.
Preamplifier and volume control
Relay-switched high precision metal foil resistors form an 80 step (1 dB) volume control. To avoid unpleasant clicking noises or harmful voltage peaks during volume adjustments, the 331 is provided with a second volume control path which is active only during volume adjustments. This secondary, IC based volume control alters the volume without any click or pops. Once the new volume is set, the 331 will revert to the sonically superior path with its high-precision metal foil resistors. The frequency bandwidth of the preamplifier section could be extended to more than 2MHz (-3dB), which does significantly reduce the phase shift in the audio band.
Phono stage (optional)
A two stage, active/passive, design equalizes the input signal according to the RIAA specifications. Tight tolerance, high quality passive components in the RIAA networks ensure highest precision of the required time-constants. Three wide bandwidth, low noise amplifier stages provide 60dB gain with minimal deviations to the ideal frequency and phase response of the system. The adjustable termination impedance (via the remote or front panel controls) allows to perfectly align the phono stage to your MC phono cartridge.
DAC (optional)
With its 4 digital inputs (SPDIF, AES/EBU, Network, USB) provides connectivity to a wide selection of digital sources. A powerful DSP converts all incoming digital music signals to the DXD format, performs the zeroPhase processing and the LEEDH volume control. One PCM1792 in mono configuration per channel takes care of the digital to analog conversion of the music signals. The internal digital filtering of the chip is bypassed for optimal results. The passive reconstruction filter sports custom made high precision components ensuring stable filter characteristics, prerequisite for a perfect compensation with the zeroPhase technology.
Operation
The 331 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.
Verified Dealers
Online Dealers
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Authorized dealers for Soulution Audio 331 integrated 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