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  1. Home
  2. Soundbars
  3. Polk Audio Signa S4 vs Yamaha SR-B40A
Polk Audio Signa S4 vs Yamaha SR-B40A
Polk Audio Signa S4

3.1.2-channel | $449

Polk Audio Signa S4
Check price atAmazon›
Yamaha SR-B40A

2.1-channel | $400

Yamaha SR-B40A
Check price atAmazon›
Polk Audio Signa S4 vs Yamaha SR-B40A: the short answer

Across 13 features we can compare from the published specs, the Polk Audio Signa S4 comes out ahead on 3 and the Yamaha SR-B40A on 0. The biggest difference for movies is height: the Polk Audio Signa S4 has 2 ceiling-firing channels and the Yamaha SR-B40A has none.

Reasons to choose Polk Audio Signa S4 over Yamaha SR-B40A
  • Channel layout: 3.1.2 vs 2.1
  • Height channels: 2 vs 0
  • HDMI inputs: 1 vs 0
Side-by-Side Comparison
Polk Audio Signa S4Yamaha SR-B40A
Channel layout
Counts speaker channels the bar actually has. More ear-level and height channels means a wider, taller sound field.		 3.1.2 2.1
Height channels
Drivers aimed at the ceiling, which is what makes Dolby Atmos sound overhead rather than just wide.		 2 0
Dolby Atmos Yes Yes
DTS:X No No
HDMI to the TV
eARC carries lossless Dolby TrueHD and Atmos from the TV; plain ARC compresses them.		 eARC eARC
HDMI inputs
A spare HDMI port for a games console or disc player.		 1 0
Subwoofer
Included beats optional beats none: a separate subwoofer is where deep bass comes from.		 Included Included
Rear speakers
Real rear speakers put effects behind you; without them surround is simulated from the front.		 None None
Room correction No No
Streaming Bluetooth only Bluetooth only
Voice assistant
Built in, rather than through a separate smart speaker.		 No No
Dialogue enhancement Yes Yes
Height
Lower is less likely to block the bottom of the TV picture.		 2.5 in 2.63 in
Width / suits TVs from
Neither is better: match the bar to your TV. See the size simulator below.		 41.13 in / 50-inch 35.81 in / 43-inch
Drivers in the bar 7 6
Power (total, as published)
Makers rate soundbar power differently, so the totals are not a like-for-like comparison.		 — 100 W
Weight — 6.4 lbs
List price $449 $400

Green marks the better figure where one is better. Dashes are specs the maker does not publish.

Size: Both Soundbars in Front of a TV

Drawn to scale. The solid bar is the Polk Audio Signa S4, the dashed outline the Yamaha SR-B40A. Pick your TV size and how it stands to see whether either would cover the picture.

Full Specifications

Polk Audio Signa S4 Specifications

Sound
Channels3.1.2
Dolby AtmosYes
DTS:XNo
DriversTweeters: 1" Dome (3); Midrange: 2.625" Height Drivers (2); Woofers: 4.75"x1.5" Cone (2); Subwoofer: 5.9375" Cone; Enclosure: Ported
SubwooferIncluded
Rear speakersNone
Virtual surroundMovie Mode
Dialogue enhancementYes
Night modeYes
Room correctionNo
Connections
HDMI to TVeARC
HDMI inputs1
HDMI version2.1
Optical inputsYes
Analogue input3.5mm
USBNo
Subwoofer outputWireless
HDMI CECYes
Streaming and Control
Wi-FiNo
BluetoothYes
Voice controlNo
Remote includedYes
Learns TV remoteYes
Physical
Dimensions (W x H x D)41.13 x 2.5 x 3.81 in / 1045 x 64 x 97 mm
Subwoofer size7.88 x 12.94 x 12.81 in (W x H x D)
Wall mountingYes (no bracket supplied)
Warranty1 Year parts, 1 Year labour
List price$449

Power is the maker's total across all drivers and is not comparable to an amplifier's per-channel rating.

Yamaha SR-B40A Specifications

Sound
Channels2.1
Dolby AtmosYes
DTS:XNo
DriversTweeters: 1" Dome (2); Woofers: 1.75" Cone (4); Subwoofer: 6.5; Enclosure: Ported
Power (bar, total)100 watts
Frequency response33-22k Hz
SubwooferIncluded
Rear speakersNone
Virtual surroundYamaha True Sound
Dialogue enhancementYes
Night modeNo
Room correctionNo
Connections
HDMI to TVeARC
HDMI inputs0
HDMI version2.0
Optical inputsYes
Analogue inputNo
USBNo
Subwoofer outputWireless
HDMI CECYes
Streaming and Control
Wi-FiNo
BluetoothYes
Voice controlNo
AppApple iOS, Android
Remote includedYes
Learns TV remoteNo
Physical
Dimensions (W x H x D)35.81 x 2.63 x 5.25 in / 910 x 67 x 133 mm
Weight6.4 lbs / 2.9 kg
Subwoofer size7.63 x 16.5 x 17.25 in (W x H x D), 17.9 lbs
Wall mountingYes (no bracket supplied)
Warranty2 Years parts, 2 Years labour
List price$400

Power is the maker's total across all drivers and is not comparable to an amplifier's per-channel rating.

More Soundbar Comparisons
  • Polk Audio Signa S4 vs JBL Bar 300MK2
  • Polk Audio Signa S4 vs Samsung HW-B750F
  • Polk Audio Signa S4 vs WiiM Bar
  • Polk Audio Signa S4 vs Furrion Aurora FSBNN30MST
  • Polk Audio Signa S4 vs Denon DHT-S517
  • Polk Audio Signa S4 vs Sonos Beam (Gen 2)
  • Polk Audio Signa S4 vs Polk Audio MagniFi Mini AX
  • Polk Audio Signa S4 vs JBL Bar 2.1 Deep Bass MK2

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