Polk Audio Signa S2 vs Polk Audio Signa S4

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Signa S2 compared with Signa S4

	Polk AudioSigna S2	Polk AudioSigna S4
Overview
Released
Released	2018	December 2021
Sound
Type
Type	Soundbar	Soundbar
Channels
Channels	2.1	3.1.2
Dolby Atmos
Dolby Atmos	No	Yes
Drivers
Drivers	Two 1.25 × 4.4 in oval midrange drivers and two 1 in tweeters; included ported subwoofer has a 5.25 in driver. Maker sheet's 165 mm parenthesis conflicts with its inch value and current maker table's 13.34 cm.	Seven soundbar drivers — two 25 mm tweeters, two 120 × 40 mm racetrack midrange drivers, one 25 mm centre full-range driver and two 66 mm elevation drivers; included subwoofer has a 150 mm woofer
Frequency response
Frequency response	45 Hz–20 kHz system response (maker; no tolerance published)	–
Audio formats
Audio formats	Dolby Digital decoding with virtual surround presentation; stereo 2.1 physical arrangement, no Atmos or dedicated centre channel (RTINGS); DTS unsupported (Heise)	Linear PCM, Dolby Digital, Dolby Digital Plus, Dolby TrueHD and Dolby Atmos (maker manual); non-Atmos content can be upmixed for virtual height effects
Room tuning
Room tuning	Movie, Music and Night modes; bass adjustment and three-level VoiceAdjust	Movie, Music and Night modes; VoiceAdjust with three levels; bass adjustment
Connections
Wi-Fi
Wi-Fi	No	No
Bluetooth
Bluetooth	Yes	Yes
AirPlay
AirPlay	No	No
HDMI eARC
HDMI eARC	No	Yes
Voice assistants
Voice assistants	None	None
Bluetooth
Bluetooth	–	Bluetooth 5.0; SBC codec; A2DP 1.3 and AVRCP 1.6; maker line-of-sight range approximately 10 m
Ports
Ports	One HDMI ARC connection, optical digital and 3.5 mm AUX input; no separate HDMI video input or passthrough	One HDMI eARC/ARC connection, optical digital input, 3.5 mm analogue input and USB-A for firmware updates; no HDMI video passthrough input
Streaming
Streaming	Bluetooth music playback; no Wi-Fi networking, app or voice control (Heise)	Bluetooth music playback; no Wi-Fi streaming or built-in voice assistant
Design
Weight
Weight	1.8 kg (better)	2.9 kg
Controls
Controls	Five top buttons, supplied IR remote and LED indicators; TV volume control over HDMI CEC	Top buttons and supplied remote; HDMI control and TV remote learning; remote lacks backlighting (WIRED)
Mounting
Mounting	Rear keyhole hangers for horizontal wall mounting	Soundbar can be wall mounted; mounting template and spacers supplied
Size
Size	Current maker table gives soundbar 89.99 × 5.46 × 8.18 cm and subwoofer 17.07 × 34.04 × 30.99 cm, W × H × D. Maker sheet rounds these to 90 × 5.5 × 8.4 cm and 17.1 × 34.1 × 31.2 cm, with bar 1.8 kg and subwoofer 5.2 kg; main weight is bar only.	Soundbar 1046 × 95 × 60 mm, W × D × H, 2.9 kg; subwoofer 200 × 328 × 280 mm, W × D × H, 4.1 kg. Main weight is bar only.
Colours
Colours	Black; Signa S2D has a different fabric finish with the same specifications (RTINGS)	Black; Signa S4D is an online-exclusive finish, not a different acoustic generation
In the box
In the box	Soundbar, wireless subwoofer, IR remote, two power cords, soundbar power supply, 1.5 m HDMI and optical cables and literature (maker sheet)	Soundbar, wireless subwoofer, remote, soundbar and subwoofer power cords, HDMI and optical cables, two AAA batteries, quick-start guide, registration and safety cards, wall template and spacers