The catch
Klipsch Flexus Core 300
There is one source input and nothing more, and the cabinet is 54 inches wide. The Bluetooth music input it has does not establish a headphone-transmitter feature.
Side by side
Klipsch Core 300 vs Sonos Arc Ultra: Arc Ultra links to Sonos headphones, Core 300 takes a player directly
Quick verdict
One HDMI source can connect directly to the Core 300, which can also reuse a powered sub, and the Arc Ultra supports TV Audio Swap to compatible Sonos headphones. The Core 300 is the choice to keep a suitable sub or get around a TV’s audio-passthrough limitation. The Arc Ultra is the choice if the Sonos headphone route or the smaller cabinet solves your room. The headphones cost extra, Wi-Fi has to stay on for TV Audio Swap, and neither standard package includes rear speakers.
Before you buy
Why, and what it costs you
With a disc collection, the TV can become the part that decides
When a player outputs a soundtrack your TV will not pass, Arc Ultra’s TV-only connection leaves that limitation in the path. Core 300 has a direct source input, so a supported soundtrack can reach the bar and the video carries on to the TV. That can help if you are replacing an old receiver but keeping a disc player. It does not make every disc or video mode compatible. Check the player output, the bar’s decoding and the video passthrough together. A household that only uses supported streaming apps built into the TV may get little from that extra input, and the other system features of Arc Ultra then matter more.
Where this comes from
Source topology, set against a documented TV passthrough limitation. The route improves only under certain conditions. No claim is made that all TVs block a format or that Core 300 supports every video mode.
The catch
Sonos Arc Ultra
It has neither a separate HDMI source input nor a generic RCA sub output. The TV and compatible Sonos accessories decide how it can expand.
Klipsch Flexus Core 300
- Why pick it
- An external player has to connect directly to the soundbar, depending on the exact formats it supports.
- You want to keep a compatible RCA-input powered sub and have room for the 54-inch bar.
- The catch
- There is one source input and nothing more, and the cabinet is 54 inches wide. The Bluetooth music input it has does not establish a headphone-transmitter feature.
Sonos Arc Ultra
- Why pick it
- Compatible Sonos headphones for TV Audio Swap are already yours or on your shopping list, and you accept its Wi-Fi and setup requirements.
- The 46.38-inch cabinet suits your space better, and the TV already deals with your sources and the audio formats you require.
- The catch
- It has neither a separate HDMI source input nor a generic RCA sub output. The TV and compatible Sonos accessories decide how it can expand.
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What this page compares
Core 300 against Arc Ultra for disc players, an existing sub and watching once a partner has gone to sleep. Weigh source routing, headphone costs and cabinet space.
Each is a premium standalone Atmos bar with optional expansion and room tuning. It is reasonable to cross-shop them. The main difference is the equipment each can connect and the routines those connections make possible.
Which one fits
Pick the situations that sound like you
A player has to send its signal to the soundbar ahead of the TV
One direct input is on Core 300. Look into its exact audio and video formats.
- Klipsch Flexus Core 300
- Better fit
- Sonos Arc Ultra
- Not suitable
The documented Sonos headphone route for TV is what you want
Arc Ultra handles it, provided you buy compatible headphones separately and keep Wi-Fi enabled.
- Klipsch Flexus Core 300
- Caution
- Sonos Arc Ultra
- Better fit
You want to keep a compatible conventional powered sub in use
The RCA output is on Core 300. Arc Ultra expands with compatible Sonos equipment.
- Klipsch Flexus Core 300
- Better fit
- Sonos Arc Ultra
- Not suitable
Your usable TV surface is 48 inches across
Arc Ultra spans 46.38 inches and Core 300 spans 54 inches. Add clearance for connections.
- Klipsch Flexus Core 300
- Not suitable
- Sonos Arc Ultra
- Better fit
In practice
Differences you will notice
With a disc collection, the TV can become the part that decides
When a player outputs a soundtrack your TV will not pass, Arc Ultra’s TV-only connection leaves that limitation in the path. Core 300 has a direct source input, so a supported soundtrack can reach the bar and the video carries on to the TV. That can help if you are replacing an old receiver but keeping a disc player. It does not make every disc or video mode compatible. Check the player output, the bar’s decoding and the video passthrough together. A household that only uses supported streaming apps built into the TV may get little from that extra input, and the other system features of Arc Ultra then matter more.
How we worked this out
Source topology, set against a documented TV passthrough limitation. The route improves only under certain conditions. No claim is made that all TVs block a format or that Core 300 supports every video mode.
An ecosystem you would skip anyway can be justified by mismatched bedtimes
If one partner wants another episode after the other has gone to bed, Arc Ultra can send TV audio to compatible Sonos Ace or Ace Ultra headphones. When two people want to watch on headphones, a second configured set can join the same session, although dynamic head tracking switches off with two listeners. Wi-Fi must be enabled on the bar, and ordinary Bluetooth headphones cannot stand in for this feature. The Bluetooth music input documented for Core 300 does not establish an equivalent route. If you pick it, look into a separate TV headphone solution. Arc Ultra wins the preference only when this routine is worth the headphone purchase and setup it requires.
How we worked this out
The manufacturer’s TV Audio Swap requirements, set against different household bedtimes and occasional headphone viewing by two people. No promise of absolute silence, guaranteed range or compatibility with every pair of headphones.
What you keep can count for more than the bar you swap out
Through its RCA output, Core 300 can keep a compatible conventional powered sub in service, which may spare you from replacing a well-placed piece of an older system. Arc Ultra expands through compatible Sonos equipment instead. On size the trade goes the other way. Arc Ultra is 7.62 inches narrower, so it may leave room for a console that Core 300 would push out. Compare the whole arrangement, meaning the sub input, the width of TV surface you have and where displaced equipment would go. A lower soundbar price loses its appeal if it forces another bass purchase or a furniture change, but no price advantage is assumed until you check the current complete offers.
How we worked this out
54 minus 46.38 = 7.62 inches, together with the documented sub connection types. The consequence for the total system is conditional. It is not a quoted saving or a universal compatibility claim.
Plug in your numbers
Is there room for the soundbar under your TV?
Measure the clear space under your TV. Count only the devices you will plug into the soundbar. Leave out the ones already connected to the TV. The numbers below are placeholders until you enter yours.
Klipsch Flexus Core 300
Fails these checksIt takes 54 inches of width, more than your 48 inches.
Sonos Arc Ultra
Fails these checksWith 0 separate HDMI source inputs, it cannot take the 1 device you want to plug into the bar.
Measure the top of an open shelf. This check does not cover enclosed cubbies. Detachable speakers count toward the docked width. Leave extra depth for cables and the TV stand. This checks size and port count only. Dolby Atmos, 4K/120Hz passthrough and the audio formats your TV supports are outside it.
Option A
Klipsch, 1072083
Klipsch Flexus Core 300
An external player has to connect directly to the soundbar, depending on the exact formats it supports.
- Best for
- An external player has to connect directly to the soundbar, depending on the exact formats it supports.
Facts we checked
- External player route: One HDMI source input plus TV eARC
- Existing bass equipment: RCA output for a compatible powered sub
- Headphone TV listening: No equivalent integrated headphone route established by the cited documentation
- Cabinet width: 54 inches
Option B
Sonos, Arc Ultra
Sonos Arc Ultra
Compatible Sonos headphones for TV Audio Swap are already yours or on your shopping list, and you accept its Wi-Fi and setup requirements.
- Best for
- Compatible Sonos headphones for TV Audio Swap are already yours or on your shopping list, and you accept its Wi-Fi and setup requirements.
Facts we checked
- External player route: TV eARC or ARC, no separate HDMI source input
- Existing bass equipment: Compatible Sonos sub expansion, no RCA sub output
- Headphone TV listening: TV Audio Swap with compatible Sonos headphones, maximum two
- Cabinet width: 46.38 inches
Spec by spec
Where they really differ
| Spec | Klipsch Flexus Core 300 | Sonos Arc Ultra | In practice |
|---|---|---|---|
| External player route | One HDMI source input plus TV eARC | TV eARC or ARC, no separate HDMI source input | With Core 300, the audio from one player can bypass the TV passthrough path. |
| Existing bass equipment | RCA output for a compatible powered sub | Compatible Sonos sub expansion, no RCA sub output | A conventional sub that already works shifts the cost comparison for the whole system. |
| Headphone TV listening | No equivalent integrated headphone route established by the cited documentation | TV Audio Swap with compatible Sonos headphones, maximum two | For different bedtimes, Arc Ultra has a documented option that comes with extra hardware and setup. |
| Cabinet width | 54 inches | 46.38 inches | At the TV, Arc Ultra saves 7.62 inches, before installation clearances are counted. |
| Room setup | Dirac with supplied microphone and a quiet measurement session | Trueplay with supported mobile devices, advanced mode requires compatible iOS | Make sure you can complete the process. Do not assume a tuning badge does the work for you. |
Trade-offs
What each pick costs you
With Klipsch Flexus Core 300
- For Dirac setup you need a quiet room and the supplied microphone. Household noise that goes on afterward is not removed by it.
With Sonos Arc Ultra
- You must buy compatible Sonos headphones separately to use TV Audio Swap. For two listeners you need two configured sets, and dynamic head tracking is turned off in that shared session.
Change of plan
When the answer changes
Compatibility with a source or powered sub you already have is the firm requirement
Go with Klipsch Flexus Core 300. Both the direct input and the RCA output come with Core 300.
The routine is solved by watching TV on compatible headphones or by a narrower bar
Go with Sonos Arc Ultra. The Sonos route is supported by Arc Ultra, in a smaller cabinet.
Decision guide
Before you buy
Movie audio for the room and a quieter evening routine are what you are after, without replacing all the equipment that already works.
What this page can’t tell you
- There is no matched test of listening, room correction or disturbance. A source input helps only with the formats it supports. A Klipsch headphone feature that is not documented is not treated as proof that every alternative headphone arrangement is impossible.
By the numbers
What the data shows
What we found across the soundbars we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Klipsch Flexus Core 300 |
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| Sonos Arc Ultra |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Klipsch Flexus Core 300
An external player has to connect directly to the soundbar, depending on the exact formats it supports.
You want to keep a compatible RCA-input powered sub and have room for the 54-inch bar.
See price & reviews on AmazonSonos Arc Ultra
Compatible Sonos headphones for TV Audio Swap are already yours or on your shopping list, and you accept its Wi-Fi and setup requirements.
The 46.38-inch cabinet suits your space better, and the TV already deals with your sources and the audio formats you require.
See price & reviews on AmazonEach link opens in a new tab.
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