Sennheiser HD 820 vs Focal Bathys Mg
Sennheiser HD 820 (#1, best overall) vs Focal Bathys Mg (#4): in our Over-Ear Headphones (Audiophile Music Picks) scoring the Sennheiser HD 820 totals 9.1/10 and the Focal Bathys Mg 8.5/10, the Sennheiser HD 820 leading on Sound Quality and Soundstage and the Focal Bathys Mg on Value.
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TopsFive comparison scores
Side by side
| Sennheiser HD 820 | Focal Bathys Mg | |
|---|---|---|
| Price | $2199 | $1129 |
| Driver Size | 56mm ring radiator | 40mm magnesium dome |
| Impedance | 300Ω | — |
| Frequency Response | 12Hz-43.8kHz | 15Hz-22kHz wireless |
| Weight | 360g | 350g |
| Design | Closed-back with Gorilla Glass reflector | — |
| Connectivity | — | Bluetooth 5.2 |
| Battery | — | 30 hours |
How they differ in real use
Built from our over ear music scoring, each product's published specifications, and verified owner feedback — not hands-on testing.
Both the Sennheiser HD 820 and the Focal Bathys Mg made our Top 5 Over-Ear Headphones (Audiophile Music Picks), at #1 (best overall) and #4. Sennheiser's flagship closed-back with 56mm ring radiator drivers and Gorilla Glass reflector technology. Delivers remarkably open soundstage for a closed-back design with up to 26 dB isolation. Proof that wireless can satisfy audiophiles. What Hi-Fi? rated it their highest-scoring wireless headphones ever, and a recent price drop to around $1,129 makes the case even stronger.
We score over-ear headphones (audiophile music picks) on Sound Quality (40%), Soundstage (20%), Comfort (15%), Build Quality (15%) and Value (10%). On that basis the Sennheiser HD 820 totals 9.1 out of 10 and the Focal Bathys Mg 8.5. The widest gap is Sound Quality, where the Sennheiser HD 820 scores 10 against 9 for the Focal Bathys Mg — audiophile-grade clarity and detail. Soundstage also separates them: 9.5 for the Sennheiser HD 820 versus 8 for the Focal Bathys Mg. The Focal Bathys Mg claws back ground on Value.
On paper, the specifications that actually differ: Driver Size — 56mm ring radiator on the Sennheiser HD 820 versus 40mm magnesium dome on the Focal Bathys Mg; Frequency Response — 12Hz-43.8kHz on the Sennheiser HD 820 versus 15Hz-22kHz wireless on the Focal Bathys Mg; Weight — 360g on the Sennheiser HD 820 versus 350g on the Focal Bathys Mg.
Pricing as of July 29, 2026: $2,199 for the Sennheiser HD 820 and $1,129 for the Focal Bathys Mg, a $1,070 difference in the Focal Bathys Mg's favor. Owners praise the Sennheiser HD 820 for 56mm ring radiator drivers with glass reflector technology and remarkably spacious soundstage for a closed-back; the most common complaint is requires quality amplification (300Ω). Owners praise the Focal Bathys Mg for audiophile-grade wireless sound and pure magnesium drivers from Clear Mg lineage; the most common complaint is nearly 3x Sony XM6 price.
Sennheiser HD 820
- 56mm ring radiator drivers with glass reflector technology
- Remarkably spacious soundstage for a closed-back
- Up to 26 dB passive isolation
- Includes balanced 4.4mm Pentaconn cable
- Requires quality amplification (300Ω)
- Very expensive
- Heavier at 360g
Focal Bathys Mg
- Audiophile-grade wireless sound
- Pure magnesium drivers from Clear Mg lineage
- Bluetooth 5.2 with LDAC
- Effective ANC
- Nearly 3x Sony XM6 price
- 30hr battery (less with ANC)
- Heavy at 350g
Which should you buy?
The Sennheiser HD 820 is the better fit for audiophiles needing isolation and critical listeners with quality amps — it is the higher-scoring pick here, chiefly for Sound Quality and Soundstage. The Focal Bathys Mg is the better fit for audiophiles needing wireless and those wanting no compromise portable sound, and the stronger choice if Value matters more to you than the overall score. If the $1,070 saving matters more than Sound Quality, the Focal Bathys Mg is the better value. The Sennheiser HD 820 is a poor fit for bass lovers; the Focal Bathys Mg is a poor fit for budget shoppers.
Choose the Sennheiser HD 820 if
- Audiophiles needing isolation
- Critical listeners with quality amps
- Those wanting closed-back without sacrificing soundstage
Skip it if
- Bass lovers
- Those without amplification
Choose the Focal Bathys Mg if
- Audiophiles needing wireless
- Those wanting no compromise portable sound
- Hi-res music listeners
Skip it if
- Budget shoppers
- Those prioritizing ANC over sound
Common questions
Is the Sennheiser HD 820 better than the Focal Bathys Mg?
In our Over-Ear Headphones (Audiophile Music Picks) ranking the Sennheiser HD 820 scores higher overall, 9.1 to 8.5, with the biggest advantage in Sound Quality. The Focal Bathys Mg is stronger on Value, so it is the better pick if that matters most to you.
How much more does the Sennheiser HD 820 cost than the Focal Bathys Mg?
$1,070 more as of July 29, 2026: $2,199 for the Sennheiser HD 820 against $1,129 for the Focal Bathys Mg. Prices move, so the merchant page shows the current figure. What the extra buys is mostly Sound Quality — 10 versus 9 in our scoring.
What is the main difference between the Sennheiser HD 820 and the Focal Bathys Mg?
The headline spec difference is Driver Size: 56mm ring radiator on the Sennheiser HD 820 versus 40mm magnesium dome on the Focal Bathys Mg. In use, the gap that matters most is Sound Quality (10 vs 9 in our scoring): audiophile-grade clarity and detail.