All the promises of an Expert Pro system.
A piece of craftmanship for extreme performance.
The Expert 250 Pro pushes the limits of power amplification thanks to an exclusive hand-polished casing, equipped with a 100% pure copper bottom plate.
ADH®, SAM®, RAM®, EVO®, DAC Magic Wire®
Up to 8 units
Standard (MM / MC)
Yes (mono / stereo)
Carved out from a single aluminium block
Universal 90-240Vac – 50/60Hz
Power cable provided adapted to the country
Patented single stage switching mode topology
High power level: 600W continuous, 4000W peak
High output with power factor correction (PFC
Width: 400mm | Depth: 400mm | Height: 40mm
2×250 Watts RMS under 6Ω
Distortion at full power
Distortion at full power
0,00025% (10W / 6Ω)
Distortion at 10w
Distortion at 10V
DC-30kHz @ -0.1dB
DC-95kHz @ -3dB
0.4° at 20kHz
1.8° at 40kHz
Below measurement threshold
2.4GHz / 5GHz 802.11ac, compatible with 802.11a/b/g/n
RJ45 100/1000 Mbps
USB Audio 2.0 Asynchronous
Very low latency
Bi-directionality (for digitisation of the analog sources)
Digital coaxial inputs
Up to 4x RCA 75Ω
Digital optical inputs
Up to 1x miniTOSLINK 3.5mm
Up to 32bits / 192kHz PCM (USB)
Up to 24bits / 192kHz PCM (AIR®, UPnP, Coaxial)
Up to 24bits / 96kHz PCM (Optical)
Up to 1bit / 3.072000MHz DSD64 (USB, Coaxial)
Up to 2x RCA stereo
Sensitivity adjustable via the Configurator
Advanced phono stage (MM / MC)
4mm banana plugs, fork connectors or stripped cables
Compatible with all speakers from 8Ω to 2Ω
Active filtering available
Up to 1x RS232 3.5mm 115200 bauds (documentation available via the Configurator)
3.5mm trigger connector Trig In and Trig Out
- 1 Devialet Expert 250 Pro
- 1 User Manual
- 1 Expert Remote (3 AAA batteries LR03 1,5V included)
- 1 User Manual1 Warranty booklet (5 years)
- 1 SD card
- 1 Power cable
- 1 Pair of gloves
- 1 Microfibre cloth
What’s the warranty on Expert Pro?
Expert Pro systems come with a 5-year warranty. Effective from date of purchase.
Can I order an optional Pre-Out board for my 140 Pro separately and install it by myself?
No, the Pre-Out board needs to be installed at our factory and therefore can only be purchased on initial order.
How can a firmware update bring extra power and dual-mono compatibility to the 140 Pro?
Our engineers have managed to increase the efficiency of the Class D board of the 140 Pro in order to get 10W extra power in stereo, and have been working hard in porting and adapting the dual-mono bridged mode from the 220 Pro and 250 Pro onto the 140 Pro, in order to deliver 210W in dual-mono with the same harmonic distorsion and signal-to-noise ratio than the 220 Pro and 250 Pro.