Products
Klipsch Flexus Core 300
Sonos Arc Ultra
Tested using Methodology v1.3
Updated Oct 24, 2025 06:15 PM
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Amazon.com
Tested using Methodology v1.3
Updated Oct 24, 2025 06:17 PM
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Channels
5.1.2
Channels
5.1.2
Our Verdict
Klipsch Flexus Core 300
Sonos Arc Ultra
The Sonos Arc Ultra and the Klipsch Flexus Core 300 are both premium 5.1.2 soundbars that you can expand with additional speakers. With the Sonos, you get the benefits of a large ecosystem of other products, a pretty simple setup, and a slightly louder and less compressed sound. And while Atmos isn't as evenly tuned on the Sonos, it sits louder in the mix. On the other hand, the Klipsch outperforms the Sonos concerning connectivity and audio format support, making it a much more flexible standalone bar that you can use as an entertainment hub and for gaming. Plus, it has a deeper low-frequency extension for a touch more bass.
Variants
- Flexus Core 300 (Black)
- Arc Ultra (Black)
- Arc Ultra (White)
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Black
Flexus Core 300
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Black
Arc Ultra
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Black
Flexus Core 300
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B&H
White
Arc Ultra
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Black
Flexus Core 300
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BestBuy.com
Black
Flexus Core 300
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Walmart.com
Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
7.9
7.7
Audio Format Support: Optical
10
0.0
Audio Format Support: HDMI In
10
0.0
Full Comparison
Design
Style - Bar
Style photo - bar
Style - Subwoofer
Style photo - sub
Sub Wireless
No
No
Enclosure
Integrated
Integrated
Style - Satellites
Style photo - satellites
Satellite Wireless
No
No
Dimensions - Bar
Dimensions photo - bar
Width
54.0" (137.2 cm)
46.5" (118.0 cm)
Height
2.9" (7.4 cm)
3.0" (7.5 cm)
Depth
4.9" (12.5 cm)
4.3" (11.0 cm)
Dimensions - Subwoofer
Dimensions photo - sub
Width
N/A
N/A
Height
N/A
N/A
Depth
N/A
N/A
Dimensions - Satellites
Dimensions photo - satellites
Width
N/A
N/A
Height
N/A
N/A
Depth
N/A
N/A
Mounting
Bar Mounting Holes
Satellite Mounting Holes
Mountable Bar
Yes
Yes
Bar Brackets Included
No
No
Mountable Satellites
No
No
Satellite Brackets Included
No
No
Build Quality
8.5
8.0
Build quality photo
In The Box
In The Box photo
Sound
Stereo Frequency Response
7.8
7.6
Stereo Setup
Raw Frequency Response
Frequency Response Small
Channels
5.1.2
5.1.2
Tested Preset
Movie
No Preset
Slope
-0.48
0.06
Standard Error
2.95 dB
2.50 dB
Low-Frequency Extension
38.9 Hz
46.9 Hz
High-Frequency Extension
19.9 kHz
18.8 kHz
Stereo Frequency Response With Preliminary Calibration
7.9
7.6
Frequency Response Calibrated
Suggested Preset
Movie
No Preset
Suggested Bass Setting
-2
0
Suggested Treble Setting
1
0
Slope
0.06
0.01
Standard Error
2.42 dB
2.53 dB
Low-Frequency Extension
40.6 Hz
46.9 Hz
High-Frequency Extension
19.9 kHz
18.8 kHz
Stereo Dynamics
7.8
8.4
Dynamic Range Compression
SPL @ Max Volume
91.8 dB SPL
93.0 dB SPL
DRC @ 90dB
1.28 dB
0.23 dB
DRC @ Max Volume
1.29 dB
0.57 dB
Center
8.5
8.5
Center Setup
Frequency Response
Localization
Discrete
Discrete
Slope
0.08
0.59
Std. Err.
2.63 dB
2.67 dB
SPL @ Max Volume
92.6 dB SPL
95.3 dB SPL
Weighted THD @ 80dB
0.45
0.63
Weighted THD @ Max Volume
1.42
1.90
Surround 5.1
6.2
6.4
Surround Setup
Frequency Response
Localization
Phantom (Side Firing, Bar)
Phantom (Side Firing, Bar)
Slope
-1.32
0.35
Std. Err.
3.45 dB
3.45 dB
SPL @ Max Volume
91.9 dB SPL
97.6 dB SPL
Weighted THD @ 80dB
0.84
3.73
Weighted THD @ Max Volume
2.34
4.31
7.1 Rears
No
No
Height (Atmos)
6.0
5.7
Height Setup
H Frequency Response
Localization
Phantom (Up Firing, Bar)
Phantom (Front Firing, Bar)
Slope
-1.28
0.25
Std. Err.
3.53 dB
4.49 dB
SPL @ Max Volume
77.9 dB SPL
85.4 dB SPL
Weighted THD @ 80dB
1.09
0.48
Weighted THD @ Max Volume
0.28
0.89
Sound Enhancement Features
9.5
5.7
Room Correction
Yes
Yes
Dialogue Enhancement
Yes
Yes
Auto-Volume/Night Mode
Yes
Yes
Subwoofer Level Adjustment
Yes
No
Bass Adjustment
Yes
Yes
Treble Adjustment
Yes
Yes
EQ
Graphic + Presets
No
Surround Level Adjustment
Yes
No
Rear Level Adjustment
Yes
No
Height Level Adjustment
Yes
Yes
Virtual Surround
Yes
No
Connectivity
Inputs/Outputs - Bar
Physical Connections Bar Photo 1
Physical Connections Bar Photo 2
Optical Audio In
1
No
HDMI Out
eARC
eARC
HDMI 2.1 Class Bandwidth
Yes
No
Full HDMI In
1
No
Analog Audio In 3.5mm (Aux)
No
No
RCA In
No
No
USB for Files
1
No
Ethernet
1
1
Subwoofer Output
Yes
No
Audio Format Support: ARC/eARC
10
9.6
Dolby Atmos
Supported
Supported
Dolby Digital
Supported
Supported
Dolby Digital Plus
Supported
Supported
Dolby TrueHD
Supported
Supported
DTS
Supported
Supported
DTS:X
Supported
Not Supported
DTS-HD MA
Supported
Not Supported
PCM Channels
Up To 7.1
Up To 7.1
Audio Format Support: HDMI In
10
0.0
Dolby Atmos
Supported
Not Supported
Dolby Digital
Supported
Not Supported
Dolby Digital Plus
Supported
Not Supported
Dolby TrueHD
Supported
Not Supported
DTS
Supported
Not Supported
DTS:X
Supported
Not Supported
DTS-HD MA
Supported
Not Supported
PCM Channels
Up To 7.1
Not Supported
Audio Format Support: Optical
10
0.0
Dolby Digital
Supported
Not Supported
DTS
Supported
Not Supported
PCM Channels
2.0
Not Supported
Audio Latency: ARC
7.3
8.1
ARC Latency Video
PCM-2.0 ch
112 ms
49 ms
PCM-5.1 ch
112 ms
45 ms
Dolby MAT (PCM) Atmos
89 ms
64 ms
Dolby Digital
102 ms
98 ms
Dolby Digital Plus
109 ms
107 ms
Dolby Digital Plus Atmos
110 ms
107 ms
Audio Latency: HDMI In
7.1
0.0
HDMI Latency Video
PCM-2.0 ch
118 ms
N/A
PCM-5.1 ch
115 ms
N/A
Dolby MAT (PCM) Atmos
94 ms
N/A
Dolby Digital
123 ms
N/A
Dolby Digital Plus
118 ms
N/A
Dolby Digital Plus Atmos
113 ms
N/A
Audio Latency: Optical
6.2
0.0
Optical Latency Video
PCM-2.0 ch
183 ms
N/A
Dolby Digital
225 ms
N/A
Video Passthrough To TV
10
0.0
1080p Max Refresh Rate
120Hz
Not Supported
1080p @ 4:4:4 Max Refresh Rate
120Hz
Not Supported
4k Max Refresh Rate
120Hz
Not Supported
4k @ 120Hz @ 10-Bit
Supported
Not Supported
4k @ 4:4:4 Max Refresh Rate
120Hz
Not Supported
8k Max Refresh Rate
60Hz
Not Supported
HDR10 Passthrough
Yes
No
HDR10+ Passthrough
Yes
No
Dolby Vision Passthrough
Yes
No
HDMI Forum VRR Passthrough
Yes
No
FreeSync Passthrough
Yes
No
G-SYNC Passthrough
Yes
No
ALLM Passthrough
Yes
No
Wireless Playback
10
9.0
Bluetooth
Yes
Yes
Wi-Fi Playback
Yes
Yes
Chromecast built-in
Yes
No
Apple AirPlay
Yes
Yes
Spotify Connect
Yes
Yes
Additional Features
Interface
Interface photo
Display
Yes
No
Bar Controls
Controls photo
Remote
Remote photo
Voice Assistants Support
Amazon Alexa
No
Yes (Built-in)
Google Assistant
No
Yes (Built-in)
Apple Siri
No
No
Microphone Mute
No
Yes
Check Price
Black
Flexus Core 300
SEE PRICE
Amazon.com
Black
Arc Ultra
SEE PRICE
BestBuy.com
Black
Flexus Core 300
SEE PRICE
B&H
White
Arc Ultra
SEE PRICE
BestBuy.com
Black
Flexus Core 300
SEARCH
BestBuy.com
Black
Flexus Core 300
SEARCH
Walmart.com
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Klipsch Flexus Core 300
Sonos Arc Ultra
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Klipsch Flexus Core 300 vs Sonos Arc Ultra: Main Discussion
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