Direct answer
For the Bose Smart Soundbar 600, source, EQ, fit, volume, codec, driver and physical contamination should be separated. First, reset EQ and test a known clean source at moderate volume.
What this covers
- Bose Smart Soundbar 600 (873973)
- Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
- The specific fault this record addresses: sounds distorted, muffled or unbalanced
What it does not cover
- ×The same symptom on a different Bose product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
An equaliser setting is applied
What separates it Sound noticeably altered across everything, with an EQ preset active in the companion app or the phone.
How to confirm Both the accessory's app and the phone can apply EQ independently, and either can be left on a preset that was tried once.
- 2
The source is low quality
What separates it Poor quality on specific content only.
How to confirm Compare against a known high-quality track. Streaming quality settings and low-bitrate sources are frequently the actual limit.
- 3
The speaker is placed where the room works against it
What separates it Boomy or thin sound tied to position rather than content.
How to confirm Placement close to a wall or in a corner reinforces bass substantially. Many speakers also have a room-calibration routine that is worth running after moving them.
- 4
Room calibration has never been run
What separates it Sound that is boomy, harsh or uneven in a room with hard floors, large windows or sparse furnishing.
How to confirm Rooms colour sound far more than most people expect. A calibration routine measures the room and compensates, and running it is usually the single largest improvement available on a speaker or soundbar.
- 5
A night, speech or dialogue-enhancement mode is active
What separates it Compressed, thin or oddly balanced sound, often with quiet passages louder than expected.
How to confirm Night mode deliberately compresses dynamic range and speech modes lift the midrange. Both are easy to leave enabled after being tried once.
- 6
The subwoofer is not connected, is out of phase, or is set too high
What separates it Bass that is either absent entirely or boomy and disconnected from the rest.
How to confirm Check the sub is bonded in the app and adjust its level. A subwoofer in a corner will always sound heavier than one placed away from boundaries.
- 7
The source is being received in a compressed format
What separates it Poor quality on one input, particularly a compressed broadcast or a Bluetooth source.
How to confirm Bluetooth is lossy, and many broadcast streams are heavily compressed. Compare against a known high-quality source over the main input.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether any EQ preset is active, in either the companion app or the phone.
- Whether it affects all content or only some.
Turn off every EQ preset in both the companion app and the phone
ReversibleEither can apply EQ independently and be left on a setting tried once and forgotten.
Run the room-calibration routine after moving a speaker
ReversiblePlacement near a wall or in a corner substantially changes the bass, and calibration compensates for it.
Turn off night mode and any speech or dialogue enhancement
ReversibleNight mode compresses dynamic range and speech modes lift the midrange; both are easy to leave on after being tried once.
Check the subwoofer is bonded and adjust its level
ReversibleA sub placed in a corner will always sound heavier, and level is adjustable independently in the app.
Move the speaker away from a corner or a rear wall as a test
ReversibleBoundaries reinforce bass substantially, and a few centimetres changes the balance more than most settings do.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- 873973. Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
- Type — compact Atmos soundbar (WiFi + eARC)
- A compact Dolby Atmos soundbar with up-firing drivers, connecting by HDMI eARC and WiFi. 'No TV sound' is the eARC/HDMI-CEC link; streaming/app is WiFi. Smaller than the Smart Ultra but with real Atmos height drivers.
- Voice & app
- Built-in voice assistants and Bose Music app setup; pairs with Bose surrounds and the Bass Module wirelessly for fuller sound.
- eARC + CEC
- Use the eARC/ARC port and enable HDMI-CEC; power-cycle both to fix a lost handshake.
- Symptom boundary
- This record covers Bose Smart Soundbar 600 when it sounds distorted, muffled or unbalanced. A different symptom on the same hardware, or this symptom on a different Bose product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Stop for distortion accompanied by heat or a burning smell, which indicates a damaged driver or amplifier rather than a settings problem.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Bose Support publishes this as "Product support". Official Bose product support; this key exists so smart-soundbar-600 cites its OWN articles — Bose publishes one per symptom per product. What that article does not carry is the model boundary — it is written for a product line, and 873973 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
Should I add a subwoofer to my Bose Smart Soundbar 600?+
The 600 is a compact Atmos bar, so its deep bass is limited by size — if you want more low end, it pairs wirelessly with the Bose Bass Module (such as the Bass Module 700), which is the intended way to add bass. That is a design characteristic, not a fault. For dialogue clarity without a sub, the soundbar's dialogue mode helps. Add Bose surrounds and a bass module through the Bose Music app for a fuller system.
Does this answer apply to every Bose model?+
No. It is scoped to 873973. Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
What should I record before troubleshooting distorted or muffled?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing distorted, muffled. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for severe distortion with heat, liquid or damaged drivers.
Answer for the exact device and software version shown above.