Echo Link Amp | Stream and amplify hi-fi music to your speakers (requires compatible Echo device for Alexa voice control) £144.99 @ Amazon

I've been after one of these for a while, lowest price I've seen

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info added by @wadz

• Upgrade your speakers with a built-in 60W x 2-channel amplifier, high-fidelity streaming music and Alexa.
• The first Echo device optimised for hi-fi stereo. Echo Link Amp’s DAC delivers premium audio quality. Supports sampling rates (44.1–96.0 kHz) over digital inputs.
• Outputs include digital optical and coaxial, RCA L/R stereo, RCA subwoofer and a high-fidelity amplified 3.5 mm headphone jack.
• Voice control music selection and playback with your compatible Echo device or the Alexa app.
• Connect Echo Link Amp to speakers and group with other supported Echo devices to play music throughout your home.
• Multiple digital and analogue inputs and outputs provide compatibility with your existing stereo equipment.
• Casting multi-room music from a line-in or Bluetooth input are not currently supported.

Size - 217 x 242 x 86 mm
Weight - 2286 g Actual size and weight may vary by manufacturing process.
Audio inputs - Analogue (1 x L/R RCA) Digital (1 x Coaxial RCA, 1 x Optical Toslink)
Audio outputs - Analogue (1 x L/R RCA, 1 x Subwoofer RCA) Digital (1 x Coaxial RCA, 1 x Optical Toslink) L/R Speaker Binding Posts - Headphone
Texas Instruments TPA6120A2 High-Fidelity Stereo Headphone Amplifier and 3.5 mm output jack.
Amplifier - 2 channel x 60W at 8 Ohms, Class D Digital Amplifier. Volume knob for granular control.

THD - Analogue/Amplified Line-out: < 0.008% Amplified headphone out: < 0.01% Measured un-weighted at 1 kHz maximum output using AES17 at 20-20 kHz bandwidth.

Frequency response - 20 Hz–20 kHz +0/-1 dB 5 Hz–22 kHz +0/-3 dB

Dynamic range - Min. 94 dB Measured un-weighted at 1 kHz maximum output using AES17 at 20–20 kHz bandwidth.

Channel separation - Analogue/Amplified Line-out: Min. 100 db Amplified headphone out: Min. 70 dB Measured un-weighted at 1 kHz maximum output using AES17 at 20–20 kHz bandwidth.

Sampling frequency - Sample rates of 44.1, 48.0, 88.2 and 96.0 kHz are supported over optical and coaxial digital inputs.

Ethernet - Single RJ45 jack supports 10/100 Mbps Ethernet.

Wi-Fi - Dual-band Wi-Fi supports 802.11 a/b/g/n (2.4 and 5 GHz) networks. Does not support connecting to ad-hoc (or peer-to-peer) Wi-Fi networks. WiFi 6 (802.11ax) is not currently supported.

Bluetooth - Advanced Audio Distribution Profile (A2DP) support for audio streaming from your mobile device to Echo or from Echo to your Bluetooth speaker. Hands-free voice control is not supported for Mac OS X devices. Bluetooth speakers requiring PIN codes are not supported.

Alexa App - The Alexa app is compatible with Fire OS, Android and iOS devices.

Accessibility - The Alexa app and Alexa-enabled products include several features for customers with accessibility needs related to vision, hearing, mobility and speech. Learn more about Alexa accessibility.

Documentation - Quick start guide or get help, tips and guidance from other owners in the Amazon Forums at uk.amazonforum.com.

Warranty & Service - Amazon Echo Link is sold with a limited warranty of one year provided by the manufacturer. If you are a consumer, the limited warranty is in addition to your consumer rights, and does not jeopardise these rights in any way. This means you may still have additional rights at law even after the limited warranty has expired (for further information on your consumer rights, click here. Use of Amazon Echo Link is subject to the terms found here.

Included in the box - Echo Link Amp, power cord and Quick Start Guide.