Description

WiiM AMP Pro + Polk ES20 Stereo Bundle (Black)

WiiM AMP PRO

The Amp Pro is the quiet one. WiiM took the original Amp platform and rebuilt the signal path around an ES9038 SABRE DAC and post-filter feedback amplification, so background hiss sits far below the music even on sensitive speakers.

It suits a lounge where television and music share the same pair of speakers. HDMI ARC accepts Dolby Digital 5.1 soundtracks from the TV, and a dedicated output hands the low end to a subwoofer when the room has one.

Control runs through the WiiM Home app, with Alexa and Google Assistant both supported, and the upgraded wireless platform keeps streaming stable even in a flat full of competing networks.

For official product information and current support resources, visit the WiiM Amp Pro product page.

ITEM	DESCRIPTION
Main Features
Post-filter feedback output	Feedback taken after the output filter holds performance steady whatever speakers are attached.
Two-way Bluetooth	Sends audio to Bluetooth headphones as readily as it receives a stream from the phone.
USB in and out	A storage drive full of music plays directly, and the USB output feeds an external DAC digitally.
Multiroom grouping	Joins other WiiM streamers, amplifiers and speakers so one playlist can run the whole house.

DETAIL	VALUE
Product Specifications
Output power	60 Watts/channel at 8 ohms; 120 Watts/channel at 4 ohms
Amplification	Class-D with PFFB (Post-Filter Feedback); TI TPA3255
DAC	ESS ES9038 Q2M SABRE
Total harmonic distortion (THD+N)	-105 dB (0.0005%) at 5W
Signal-to-noise ratio (SNR)	120 dB (A-weighted)
Inputs	1 × HDMI ARC (stereo PCM and Dolby Digital; DTS not supported); 1 × optical, up to 192kHz/24-bit; 1 × RCA line-in (2 Vrms, digitised up to 192kHz/24-bit); USB storage (FAT32, NTFS, EXT4)
Outputs	Passive speaker terminals (banana plugs, L and R); subwoofer out (2.0 Vrms); USB out (UAC 2.0, up to 192kHz/24-bit)
Network and wireless	Wi-Fi 6 (upgradeable to Wi-Fi 6E via software update); 10/100Mbps Ethernet; Bluetooth 5.3, two-way
Streaming protocols	Google Cast Audio, Spotify Connect, TIDAL Connect, Alexa Cast, DLNA, Squeezelite, Roon Ready (AirPlay 2 is not supported)
Voice control	Alexa, Google Assistant
Power input	100-240V AC, 50/60Hz, 4A max
Dimensions	190 × 190 × 63 mm (7.48 × 7.48 × 2.48 in)
Weight	1.84 kg (4.1 lbs)
Package Contents
In the box	1 × WiiM Amp Pro; 1 × WiiM Voice Remote; power, HDMI, RCA and optical cables (1.5m each); quick start guide

Polk ES20 Bookshelf

The Polk Signature Elite ES20 is a full-size bookshelf option for music, television and cinema systems that benefit from a properly engineered stand- or shelf-mounted speaker.

Its Power Port bass-vented enclosure and Signature Elite driver array give it a purposeful role as a stereo pair, front channels or part of a larger matched system. The format keeps floor space clear while still making room for a substantial cabinet.

Pair the ES20 with an amplifier or AV receiver suited to the official power and impedance guidance below, then add other Signature Elite speakers as the system grows.

For official product information and current support resources, visit the Polk Audio Polk ES20 Bookshelf product page.

ITEM	DESCRIPTION
Main Features
Full-size bookshelf role	Suited to left/right stereo use or as front channels in a compatible home-cinema system.
Power Port bass enclosure	The bass-vented design is engineered as part of the speaker rather than added as a generic port.
System-building flexibility	Part of the Signature Elite range for coordinated multi-channel installations.

DETAIL	VALUE
Product Specifications
Quantity Included	Pair
Height	14.8" (37.59 cm)
Width	8.5" (21.59 cm)
Depth	13.8" (35.05 cm)
Weight	17 lbs (7.71 kg)
Driver Complement	• (1) 1" (2.54 cm) d (Round) Terylene High-Res Dome Tweeter • (1) 6.5" (16.51 cm) d (Round) Dynamic Balance Mica Reinforced Polypropylene Driver
Driver Enclosure Type	PowerPort Bass Vented
Total Frequency Response	41 Hz → 40 kHz
Sensitivity (2.83V @1m)	86 dB
Recommended Amplifier Power Per Channel	20 watts → 125 watts
Crossover Frequency	2.4 kHz
Impedance	Compatible with 4 and 8 ohm outputs
Inputs	(1) Pair of 5-way Binding Posts - Gold Plated