• Skip to main content

Soulution

Nature of sound

  • 7 Series
    • 787 turntable
    • 760 DAC
    • 757 deemphasis pre
    • 727 pre
    • 717 stereo / mono
    • 701+ & 711+ Upgrades
  • 5 Series
    • 560 DAC
    • 550 phono
    • 525 Pre
    • 511 Stereo / Mono
  • 3 Series
    • 360 DAC
    • 350 phono stage
    • 331 integrated
    • 326 preamplifier
    • 312 stereo amplifier
  • About
    • Reviews
    • Distributors
    • Downloads
  • Deutsch

soulution 525 preamplifier

Uniting source components with power amplifiers, it must perform the critical functions of impedance matching, level balancing and volume control while maintaining perfect signal accuracy and channel integrity. Adding nothing. Taking nothing away.

While the perfect preamplifier continues to be a technical challenge for audio designers, we believe the 525 gets closest to the ideal.

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.

Specifications

Mains220 – 240 V (50 – 60 Hz)
100 – 120 V (50 – 60 Hz)
Power consumption< 0.5 W standby
100 W device in operation
Inputs2 × balanced (XLR)
2 × unbalanced (RCA)
Input ImpedanceXLR:
RCA:
820 kΩ
47 kΩ
Outputs1 × balanced (XLR)
1 × unbalanced (RCA)
Frequency response (– 3 dB)0 – 2 MHz
THD + N< 0.00009% (20 Hz – 20 kHz)
Signal-to-noise ration120 dB
Channel separation130 dB @ 1 kHz
Gain max+ 15 dB
Volume control range+ 15 DB to – 79 dB in 1 dB steps
Output impedance10 Ω balanced (XLR)
10 Ω unbalanced (RCA)
Output voltage16 VRMS balanced (XLR)
8 VRMS unbalanced (RCA)
Output current max0.2 A (limited)
Dimensions442 × 143 × 448 mm
(W × H × D)
Weightapprox. 20 kg
LINK (remote turn-on)12 V control signal

  • Downloads
  • Facebook
  • Imprint
  • Privacy policy
  • Cookie Policy (EU)

© 2025 · soulution · SPEMOT AG · Dulliken, Switzerland · e-mail: info@soulution-audio.com

Manage Cookie Consent
To provide the best experiences, we use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Functional Always active
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes. The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.
Manage options Manage services Manage {vendor_count} vendors Read more about these purposes
View preferences
{title} {title} {title}