If you've read our individual reviews of the SONR Music 2 and the SONR Multisport, you already know both are strong devices. The question that actually matters is which one matches how you train — and that's what this comparison settles.
SONR Music 2
Larger buttons, more stable through turns, 16 GB.
SONR Multisport
32 GB, 8-hour battery, built for swim + run + bike.
The Quick Answer
If you only swim, get the SONR Music 2 — it's more refined for that single use case, with a fit and button design purpose-built for the pool. If you train across swimming, running, and cycling, or you're a triathlete doing brick sessions, the SONR Multisport is the more logical buy: double the storage, double the battery, and a fit designed to hold through runs and rides, not just laps.
Spec-by-Spec Comparison
| Spec | SONR Music 2 | SONR Multisport |
|---|---|---|
| Primary use case | Swimming | Swim + run + bike |
| Storage | 16 GB | 32 GB |
| Battery | Not specified — check listing | Up to 8 hours |
| Controls | Large tactile buttons | Standard controls |
| Fit under swim cap | Excellent | ~ Good |
| Stability on runs/rides | ~ Not designed for it | Excellent |
| Bluetooth + MP3 dual mode | ~ Check listing | ✓ |
| Waterproof | IPX8 | IPX8 |
The Case for SONR Music 2
The Music 2 is a focused refinement of a device that already did one thing well: swimming. The larger, tactile buttons solve the real-world annoyance of adjusting controls with wet, gloved-feeling fingers mid-set, and the improved stability through turns and push-offs means less audio dropout exactly when you're moving fastest. If your training doesn't extend meaningfully into running or cycling, there's no reason to pay for capability you won't use.
Choose Music 2 if
- You're a dedicated lap swimmer
- You want the most refined pure-swim fit
- You frequently adjust volume or tracks mid-set
- You don't need cross-training features
Music 2 falls short if
- You also run or cycle regularly
- You want maximum storage or battery
- You're training for a triathlon
The Case for SONR Multisport
The Multisport exists because a swim-only device doesn't serve triathletes well. Doubling both storage and battery isn't just a spec bump — it reflects a device meant to be worn across an entire training week without swapping headphones or thinking about charge levels. The wrap-around fit that makes it stable on a run is a small trade-off in the pool, but a real gain everywhere else.
Choose Multisport if
- You train across swim, run, and bike
- You do brick workouts
- You want one device instead of three
- You need longer battery for bigger training weeks
Multisport falls short if
- You only ever swim
- You want the slimmest possible under-cap profile
- Budget is the deciding factor
Bottom Line by Athlete Type
- Pool-only lap swimmers
- Masters swimmers and swim clubs
- Open water swimmers who don't run/bike
- Triathletes and duathletes
- Runners/cyclists who also swim
- Anyone doing brick sessions
Final Verdict
Neither device is a straightforward "winner" here — they're built for different training patterns. The SONR Music 2 is the sharper tool for swimming alone. The SONR Multisport is the better investment the moment your training crosses into running or cycling. Match the device to your actual week, not the spec sheet.