Интегральные усилители — Extraudio X800 MKII

The X800 MKII is a hybrid integrated amplifier from Extraudio, whose products are designed in the Netherlands. It combines a valve preamplifier section taken from the XP5 MKII 2026 Edition platform with power stages built on the brand's own Class AD EPAM amplification modules. The maker cites 21 improvements in the MKII version over the original MKI design.

Key specs that matter

Rated output is 400 W per channel into 8 ohm and 800 W per channel into 4 ohm, with a peak output current of 80 A in total. The power section quotes THD+N of 0.0028% at 1 kHz and 1 W, 120 dB signal-to-noise and a damping factor of 1200 into 8 ohm. The preamplifier section is specified at 20 Hz to 20 kHz within 0.05 dB, distortion below 0.003% at 1 kHz, 100 dB(A) signal-to-noise and 102 dB(A) dynamic range. The chassis measures 44 x 12 x 40 cm and weighs 15 kg.

Engineering and use context

Two 6922/ECC88 dual-triode tubes run in pure Class A in the valve stages. The rear panel offers four RCA line inputs plus a single XLR input, together with a dedicated RCA turntable input with a grounding terminal. A processor bypass on both RCA and XLR lets an AV processor drive the unit as a straight power amplifier, letting one unit handle both two-channel and surround duties. Level control relies on a motorised ALPS Blue Beauty potentiometer with 128 microcontroller-managed positions, and the front-panel LED illumination is adjustable. The housing is made of 6061 aluminium with 20 mm thick front and side panels. Boards are hand-soldered with high-silver tin, and components are hand-selected and matched per channel. The amplifier runs on 115 V or 230 V mains, has a peak capability of 1500 W and draws under 0.5 W in standby. The rechargeable RC2 remote charges over USB and covers power, volume, mute and source selection at a range of 20 to 80 metres. Black and grey versions come with a ceramic ultra-matte finish.

Pairing

The WBT speaker connectors are rated for 30 A continuous and 200 A peak, and the high current reserve suits low-impedance or low-sensitivity loudspeakers. No digital converter is built in, so digital sources need an outboard converter or a streamer with analogue outputs. An optional pure Class A phono module for MM and MC cartridges can be fitted at extra cost to serve the turntable input.

Alternatives

The Extraudio X251 is another integrated amplifier from the same maker, listed alongside the X800 in the brand's earlier production generations.