Head-to-head · Best Soundbars Under $300

Polk Audio Signa S4 vs Yamaha SR-B40A

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Polk Audio Signa S4 comes out ahead by a narrow margin (4.5 vs 4.4). The gap is mostly about movie watchers who want true Dolby Atmos height effects and best-in-class dialog clarity without paying $500+ — read the strengths below before deciding.

Higher ratedRanked #2 in Best Soundbars Under $300

Polk Audio Signa S4

4.5

$300

The Signa S4 is the Dolby Atmos pick at this price tier. Two real upfiring speakers create height effects that DTS Virtual:X (Samsung HW-B750D) and Yamaha SR-B40A can only virtualize. The 3.1.2 channel layout with wireless sub is a step up from 2.1 competitors in this lineup. The catch: MSRP is $399, but it routinely sells for $250-300 on sale — which is when it becomes the obvious pick.

Strengths

— Real Dolby Atmos with two upfiring height channels — only Atmos-certified pick in this round-up
— 3.1.2 channel configuration with wireless subwoofer included
— Polk VoiceAdjust technology brings dialog forward — best speech clarity in this lineup

Watch-outs

— MSRP of $399 — only fits under $300 on sale (frequently does)
— Bluetooth only — no Wi-Fi, AirPlay, or Chromecast like the Polk MagniFi Max
— Smaller subwoofer (5.9") than the Samsung HW-B750D

$300 · Check Price on Amazon Full review →

Ranked #4 in Best Soundbars Under $300

Yamaha SR-B40A

4.4

$300

The SR-B40A is the smaller-room specialist. Yamaha's tuning prioritizes dialog clarity and balanced tonal response over raw volume, which makes it the right pick for apartments and bedrooms where the Samsung HW-B750D or Polk Audio Signa S4 would overwhelm the space. Virtual Atmos is decent but predictably not on par with the real upfiring channels on the Signa S4. The Clear Voice mode is the standout feature.

Strengths

— Optimized for small-to-medium rooms — apartment-friendly sound balance
— Virtual Dolby Atmos via Yamaha's DSP processing
— Clear Voice mode is one of the most natural dialog enhancers in this round-up

Watch-outs

— 2.1 channel layout — loses to the Samsung HW-B750D and Vizio M-Series 5.1 on surround capability
— Virtualized Atmos — no real upfiring drivers like the Polk Audio Signa S4
— Sometimes sits at or just above $300 — buy on sale to fit budget

$300 · Check Price on Amazon Full review →

How they stack up

Polk Audio Signa S4

Only real Dolby Atmos pick here. Beats the Samsung HW-B750D, Yamaha SR-B40A, Polk Audio Signa S2, and Vizio M-Series 5.1 on Atmos certification. Loses to the Samsung HW-B750D on channel count (3.1.2 vs 5.1). Polk VoiceAdjust gives it the dialog-clarity edge.

Yamaha SR-B40A

Best dialog clarity in this lineup along with the Polk Audio Signa S4. Smaller-room focus differentiates it from the Samsung HW-B750D and Vizio M-Series 5.1's bigger-room 5.1 setups. Same channel count as the Polk Audio Signa S2 but with virtual Atmos that the Signa S2 lacks.

Specs side-by-side

Spec	Polk Audio Signa S4	Yamaha SR-B40A
Channels	3.1.2 (with upfiring)	2.1
Subwoofer	Wireless 5.9" included	Wireless included
Audio Formats	Dolby Atmos, Dolby Digital	Dolby Atmos (virtual), Dolby Digital
Connectivity	HDMI eARC, Optical, Bluetooth	HDMI ARC, Optical, Bluetooth 5.1
Dialog Tech	VoiceAdjust	Clear Voice

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