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255i Stereo Integrated Amplifier

The Worlds Most Powerful Integrated Amplifier*

The 255i is Perreaux's most powerful, most sophisticated integrated amplifier. It's performance and specifications are truly impressive, but hearing the 255i is when you will truly appreciate the quality engineering, design and craftsmanship. The 255i is the most advanced integrated amplifier Perreaux has ever produced.

Optional internal 32-bit/384kHz Digital to Analogue Converter (DAC) and Moving Magnet/Moving Coil (MM/MC) Phono Preamplifier modules ensure complete integration of digital source components (such as network music servers and set-top digital receivers), as well as turntables, into a high-performance system.

Find your nearest dealer to experience the éloquence 255i integrated amplifier for yourself.

*In reference to the 255i as a Class-AB integrated amplifier.

General Features

High Power Design

The 255i is designed to handle difficult speaker loads with ease. With it's high powered MOSFET design, the 255i is capable of continuously delivering a genuine 360Wrms into an 8Ω load and a huge 530Wrms into 4Ω.

High-current Custom Power Supply

At the heart of any great amplifier is a great power supply. 3 separate transformers feeding 4 independent power supplies ensure the 255i will drive difficult speakers with ease, producing controlled, quality audio.

High Damping Factor

The 255i's performance features a high damping factor. Ensuring absolute authority and control of any loudspeaker.

Advanced Microprocessor Control

The extensive range of user functions and complex functions are managed by a powerful onboard microprocessor. This gives you more control but is electrically isolated from the audio paths, ensuring faithful sound reproduction.

Advanced Stepped Volume Control

3rd generation microprocessor controlled analogue volume control. The éloquence has advanced all the benefits of a pure unaltered analogue signal path which is merely "switched" to your exact desired volume. This gives you convenience and complete control with the cleanest signal path possible.

Advanced Lossless Stepped Off-Set Balance Control

3rd generation microprocessor controlled analogue balance control. There is no loss of music quality due to the left and right volume controls being analogue "switched" independently without added circuitry. This is the ultimate in allowing you to perfectly adjust the balance volume left or right without signal loss.

Non-Invasive Protection

The 255i features sophisticated microprocessor protection for the amplifier and connected load. The protection covers supply (soft-charge), over-current, over-temperature, DC offset, internal AC supply and DC fuse protection. The protection is non-invasive and does not degrade the signal path.

Internal Headphone Amplifier

The headphone amplifier gives the user all the benefits of the 255i's engineering and design advances, with the convenience of headphones.

Dual sets of speaker binding posts

For ease of bi-wiring loudspeakers and enhanced sound quality.

Balanced (XLR) input

For use with balanced sources. Enabling you to take full advantage of the benefits of balanced audio.

Home Theatre/Pass-Through Loop

Allows the integration of the éloquence into a home theatre/external system as a two channel power amp, then back to full a stereo integrated for music listening.

iPod Input

Plug your iPod directly into the front panel for convenient iPod connectivity.

IR (infrared) input and output

Enables additional remote control options to be connected and controlled by the éloquence Integrated Amplifier.

Trigger input and output

Allows the 255i to have standby contol over, or be controlled by, connected equipment. Offering high system integration and convenience.

Isolation Feet Options

To minimize vibrations, aftermarket "feet" can be easily attached if desired. Also, the éloquence has the ability to go from 4 feet to 3 feet to further ensure mechanical isolation

User Controls

Interactive Menu System
Infrared (IR) Remote Control
Volume Up/Down

I/O Compliment


1 pair Balanced Inputs (XLR)
4 pairs Unbalanced Inputs (RCA)
1 Amp In (RCA)
1 Auxiliary (3.5mm jack)


1 pair Unbalanced Line Outputs (RCA)
1 pair Unbalanced Preamplifier Outputs (RCA)
2 pairs Binding Posts per channel
1 Headphone (6.35mm jack)


1 Trigger input (3.5mm jack)
1 Trigger output (3.5mm jack)
1 External IR input (3.5mm jack)
1 IR output (3.5mm jack)
1 RS232 serial port (RJ45)

Optional Modules*

USB Digital to Analogue Converter (DAC)

32-bit/384kHz upsampling allows high quality digital audio connections to be made. Inputs include 2x Coax, 2x Optical (Toslink) and 1x USB audio.

MM/MC Phono Stage

Allowing both Moving Magnet (MM) and Moving Coil (MC) cartridge connection.

* These optional modules are retrofittable and available after purchase


Width: 426mm (16.8")
Depth: 344mm (13.5")
Height: 149mm (5.9")
Weight: 25kg (55lb)


Rated Power Output (per channel): 250W into 8Ω
500W into 4Ω
Maximum Power Output (prior to clipping, per channel): 360W into 8Ω
530W into 4Ω
Total Harmonic Distortion + Noise
 20Hz to 20kHz:

0.002% @ 1kHz, 250W into 8Ω
0.010%, 250W into 8Ω
Frequency Response
 20Hz to 20kHz:
 5Hz to 60kHz:

+0.00dB, -0.15dB
+0.00dB, -0.50dB
Damping Factor: 800 @ 1kHz, 250W into 8Ω
Signal to Noise Ratio (unweighted): better than 98dB, ref. 250W


Input Impedance

Input Overload

Volume Control Range: -95.5dB to +31.5dB
Volume Control Resolution: 0.5dB per step
Input Volume Trim Range: ±40dB
Balance Resolution: 0.5dB
Balance Range: ±40dB

Headphone Amplifier

Headphone Rated Power Output: 1.0W into 32Ω
150mW into 300Ω

Headphone Total Harmonic Distortion + Noise

20Hz to 20kHz:
0.001% @ 1kHz, 1.0W into 32Ω
less than 0.002%, 1.0W into 32Ω
Headphone Volume Trim Range: ±40dB

255i DAC Module Specifications

Digital Inputs: 2 SPDIF Coax (RCA)

2 SPDIF Optical (Toslink)
1 USB (Type B)

Chipsets: ES9038PRO Sabre DAC / XMOS chipset solution (32 bit / 140db noise floor)
Input Sample Rate: 32, 44.1, 48, 88.2, 96, 176.4, 192kHz (Coax, Optical)
32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /  DSD 64, 128, 256  (USB)
Input Word Length (maximum): 32-bit (Coax, Optical)
32-bit (USB)
Input Impedance: 75Ω (Coax)
Transformer Coupled

Asynchronous and Galvanically Isolated

Analogue Section

Digital to Analogue Conversion: 32-bit/384kHz
Output Voltage: 2.0Vrms @ 0dBFS
Total Harmonic Distortion + Noise 0.002%, 20Hz-20kHz @ 0dBFS

Frequency Response

20Hz to 20kHz:
5Hz to 94kHz:

+0.0dB, -0.1dB
+0.0dB, -3.0dB

Dynamic Range (unweighted): better than 115dB @ 0dBFS
Signal to Noise Ratio (unweighted): better than 115dB @ 0dBFS
Channel Separation: better than 110dB @ 0dBFS
Stop Band: 105kHz
Stop Band Attenuation: 125dB

255i Phono Module Specifications

Input Impedance
Low Gain (MM):
High Gain (MC):

Input Capacitance:


Low Gain (MM):
High Gain (MC):


Total Harmonic Distortion + Noise
20Hz to 20kHz:

0.002% @ 1kHz, low gain setting
less than 0.010%, low gain setting
RIAA Accuracy: ±0.5dB, 20Hz-20kHz
Signal to Noise Ratio (unweighted):

better than 85dB, low gain setting

Brochures & Manuals


255i Integrated Amplifier [Lithuanian]

2018 PDF 372 KB

The Perreaux amplifier delivers expressive and emotional sound, in which the subtle nuances are clearly heard. Energy and power harmoniously combine with compact dimensions and elegant design of the device. The Perreaux 255i is a versatile device that is great for high end enthusiasts who do not miss out on modern multimedia capabilities.

255i Integrated Amplifier - HiFi News

2018 PDF 432 KB

Still billed as ‘The World’s Most Powerful Integrated Amplifier’, Perreaux’s MOSFET flagship has been tickled-up with a new digital input module. And more power too...? Review: Ken Kessler Lab: Paul Miller