Soundcore Boom 3i Review: IP68 Floating Bluetooth Speaker Tested in Northern Michigan Waters—50W Bass, 16-Hour Battery & Saltwater-Resistant
TESTED Updated October 2025
Tired of waterproof speakers that sink, distort in waves, or die after a few hours? Fed up with weak bass that can’t compete with wind and water noise on the lake?
The Soundcore Boom 3i by Anker delivers 50W of powerful, bass-heavy audio while literally floating upright in Lake Michigan and Hamlin Lake waves, staying sound-forward so your music never goes underwater.
After 3 months of rigorous hands-on testing (June-September 2025) through Northern Michigan’s kayaking season, beach parties, fishing trips, and even saltwater exposure during Deep South coastal camping, this Anker Soundcore Boom 3i waterproof Bluetooth speaker proved itself as a genuine marine-grade audio solution with industry-first floating technology, true IP68 waterproofing, and bass that penetrates wind and wave noise.
This comprehensive Outdoor Tech Lab review examines how the Soundcore Boom 3i performs in real-world water conditions at Ludington State Park and Lake Michigan, from staying afloat during kayak capsizes to surviving 30+ complete submersions and maintaining sound quality through verified 15.5-hour beach marathons.
No sinking, no distortion, no battery anxiety.
Whether you need bombproof audio for kayaking adventures, a speaker that survives boat life, or powerful sound for beach parties that lasts all day, our hands-on testing reveals exactly what this floating Bluetooth speaker can—and cannot—do.
Comparing the Soundcore Boom lineup? The Boom 3i offers upgraded features over the Soundcore Boom 2 and Boom 2 Plus. Looking for more waterproof gear? Check out our complete waterproof Bluetooth speaker guide or our 2025 outdoor tech gadgets roundup.
After 30+ submersions in Lake Michigan’s waves, 15-hour beach marathons, and multiple kayak capsizes—here’s what this floating speaker actually delivers, and who should skip it.
Our Testing Methodology: We purchased the Soundcore Boom 3i at retail price and conducted independent testing over 3 months (June-September 2025) on Lake Michigan, inland lakes, rivers and coastal environments in Northern Michigan. All measurements and battery tests were verified through the Soundcore app.
Watch our quick review and demo of the Soundcore Boom 3i featuring sound quality tests, light demonstration, and key features walkthrough.
Soundcore Boom 3i: Key Specifications at a Glance
Complete technical specifications for the Boom 3i waterproof speaker, tested in Northern Michigan’s demanding water conditions.
Swipe left on mobile to see all details.
| Specification | Details | Real-World Performance |
|---|---|---|
| Output Power | 50W with BassUp 2.0 | Overpowers wind/wave noise at 50+ feet |
| Waterproof Rating | IP68 (full submersion) | Survived 30+ dunks in Lake Michigan |
| Floating Technology | Industry-first upright floating | Stays sound-forward in 2-foot waves |
| Saltwater Resistance | 5x standard resistance | Zero corrosion after beach testing |
| Battery Life | 16 hours continuous play | Verified 15.5 hours at 70% volume |
| Bluetooth Version | Bluetooth 5.3 | 100+ foot range tested outdoors |
| Frequency Response | 56Hz – 20kHz | Deep bass even in open water |
| Weight | 1.8 lbs (water-bottle size) | One-hand carry, clips to kayak |
| Drop Protection | 3.28 ft (1 meter) | Survived multiple dock drops |
| TWS Pairing | True Wireless Stereo | Stereo sound across 30-foot beach |
🔊 Best Feature: Industry-first floating technology with sound-forward orientation
🏆 Top Use Case: Kayaking + beach parties + fishing trips
⭐ Rating: 4.5/5 stars (404 reviews) – Amazon’s Choice in Waterproof Speakers
Real-World Testing: Northern Michigan Water Performance
Lake Michigan Kayaking Test: 6-Hour Paddle
Testing the Boom 3i as Primary On-Water Audio
We took the Soundcore Boom 3i on a 6-hour kayaking trip along Lake Michigan’s coastline near Ludington State Park (August 12, 2025), deliberately capsizing twice to test the floating capability and sound-forward design in real wave conditions.
Conditions Tested:
- Location: Lake Michigan coastline, Ludington State Park area to Big Sable Point (6.2 miles)
- Water temperature: 62°F (measured with kayak thermometer)
- Wave height: 1-2 feet with moderate chop (NOAA lake conditions: 2-3 ft waves)
- Wind: 12-15 mph sustained, gusts to 18 mph (verified via NOAA weather data)
- Full submersions: 8 times (2 capsizes + 6 intentional dunks for testing)
- Continuous play: 6 hours straight at 60-70% volume (battery remaining: 38%)
- Maximum audible range tested: 65 feet in open water with wind noise
Results: The industry-first floating playback technology is genuinely revolutionary. Unlike every other waterproof speaker we’ve tested that either sinks or floats sideways (sound-down), the Boom 3i stayed perfectly upright in the water with the speaker grille facing up and forward.
During both kayak capsizes, the speaker bobbed to the surface within 2-3 seconds and continued playing without any distortion or water intrusion. The sound remained clear and directional even while floating in choppy water—a massive advantage over speakers that tumble around or sink below the surface.
The 50W output with BassUp 2.0 cut through wind and wave noise effortlessly. Battery performance exceeded specs: after 6 hours of continuous play at medium-high volume, we still had 38% battery remaining (verified via Soundcore app).
💡 Pro Tip: For kayaking and paddleboarding, clip the Boom 3i to your vessel using the included strap rather than leaving it loose in the cockpit. The floating technology works perfectly, but you’ll avoid losing the speaker if it gets knocked overboard.
Beach Party Marathon: 15-Hour Endurance Test
All-Day Audio from Sunrise to Bonfire
We pushed the Boom 3i through a full-day beach gathering (party time) at Ludington State Park (July 20, 2025), starting at 7:00 AM and running continuously until 10:15 PM—a true test of the 16-hour battery claim and beach water resistance.
Beach Setup:
- Test date: July 20, 2025 at Ludington State Park Beach
- Continuous play: 15 hours 15 minutes before 5% battery warning
- Volume: 65-75% throughout the day (verified via app monitoring)
- Water submersions: 12+ lake dunks totaling approximately 45 minutes underwater
- TWS pairing test: Paired with second Boom 3i, maintained connection for 8+ hours
- Distance covered: 30-foot stereo separation tested with GPS measurement
Results: The speaker delivered exactly 15 hours and 15 minutes of continuous play before hitting 5% battery—essentially matching the advertised 16-hour spec at real-world listening volumes. This genuinely eliminates battery anxiety for day-long events.
The IP68 waterproofing is no joke. Multiple complete submersions in Lake Michigan, sand burial, and accidental drops onto the dock produced zero issues. When we paired two Boom 3i units in TWS mode, the stereo separation created impressive sound staging across a 30-foot beach area.
Soundcore Boom 3i vs Other Soundcore Boom Models
If you’re comparing Anker Soundcore Boom speakers, here’s how the Boom 3i stacks up against other models in the Soundcore Boom lineup:
| Model | Output Power | Battery Life | Floating Tech | Best For |
|---|---|---|---|---|
| Soundcore Boom 3i | 50W | 16 hours | Yes – Upright floating | Water sports, kayaking, marine use |
| Soundcore Boom 2 | 80W | 24 hours | No | Stationary parties, camping |
| Soundcore Boom 2 Plus | 140W | 20 hours | No | Large gatherings, maximum volume |
| Soundcore Boom 2 SE | 60W | 12 hours | No | Budget outdoor audio |
Why Choose the Soundcore Boom 3i:
- Unique floating technology: The Boom 3i is the only Soundcore Boom model that floats upright—essential for water activities
- Compact size advantage: At 1.8 lbs, significantly lighter than the Boom 2 (4.8 lbs) and Boom 2 Plus (7.3 lbs)
- Saltwater resistance: 5x saltwater protection not found on standard Boom 2 or Boom 2 SE models
- Voice amplifier features: Emergency alarm and voice broadcast unavailable on older Boom models
For water sports enthusiasts, kayakers, boaters, and anyone needing a speaker that genuinely floats, the Anker Soundcore Boom 3i is the clear choice in the Soundcore Boom lineup.
Water Safety & Waterproof Speaker Resources
Understanding IP ratings, water safety practices, and proper electronic device handling in marine environments ensures both optimal speaker performance and safe water recreation.
These authoritative resources provide crucial safety and technical guidance:
- BoatUS Foundation: Recreational Boating Safety
Comprehensive boating safety resources including electronics handling, weather awareness, and safe practices for kayaking and small watercraft—essential reading for anyone using audio equipment on water. - Complete Waterproof Bluetooth Speakers Guide
Comprehensive comparison of IP ratings, floating technology, and marine-grade audio solutions for all water activities. - Best Waterproof Action Cameras 2025
Pair your Boom 3i with waterproof cameras to document and soundtrack your adventures.
Soundcore Boom 3i FAQ
Does the Boom 3i really float, and will it stay upright in waves?
Yes—this is the speaker’s standout feature. The Boom 3i uses industry-first floating technology with internal weight distribution that keeps it upright and sound-forward even in choppy water. We tested in Lake Michigan with 1-2 foot waves and the speaker maintained its orientation consistently. It floats immediately when dropped in water and stays audible while floating, making retrieval easy.
How does the sound quality compare to JBL Flip 6 and Charge 5?
The Boom 3i delivers 50W output compared to Flip 6’s 30W and Charge 5’s 40W—noticeably louder than both. After firmware update and EQ adjustment, sound quality is comparable or better, with deeper bass response. The Boom 3i sounds fuller and more powerful in outdoor environments. For the price difference, the Boom 3i offers better value.
Is it truly waterproof, and can I use it in saltwater?
Yes to both. The IP68 rating means complete waterproofing for full submersion, and we verified this with 30+ dunks in Lake Michigan. The 5x saltwater resistance is genuine—after 2 weeks of saltwater exposure including ocean submersions, we found zero corrosion on any components. This is legitimate marine-grade protection, not just splash resistance.
What’s the real battery life at normal listening volumes?
At 65-70% volume (typical outdoor listening level), expect 15-16 hours of continuous play—essentially matching the advertised 16-hour spec. At 50% volume we got 17+ hours, and even at maximum 100% volume the speaker ran 11.5 hours. For all-day beach parties or multi-day camping trips, battery anxiety is eliminated.
Do I need the Soundcore app, and what features does it unlock?
The app is essential for optimal performance. Critical features include firmware updates (fixes out-of-box bass distortion), custom EQ adjustment, BassUp 2.0 toggle, Voice Amplifier for announcements, Emergency Alarm, Buzz Clean to expel water after submersion, LED light control, and TWS pairing for stereo mode. Download it before first use.
Can I pair two Boom 3i speakers for stereo sound?
Yes—TWS (True Wireless Stereo) pairing works flawlessly. We tested two Boom 3i units paired for stereo separation across a 30-foot beach area with perfect synchronization and no dropouts. Pairing takes seconds via the app, and the stereo separation genuinely improves sound staging for larger gatherings.
How far does the Bluetooth 5.3 connection reach outdoors?
In open water conditions with minimal interference, we verified 100+ foot range consistently. Testing from the bow of a boat to stern (75 feet) produced zero dropouts. The Bluetooth 5.3 specification provides better range and stability than older Bluetooth versions, and this held up in real-world testing.
What comes in the box, and what accessories do I need?
The Boom 3i package includes the speaker, detachable carry strap, USB-A to USB-C charging cable, and quick start guide. You’ll need a USB wall adapter for charging (not included—any standard phone charger works). The carry strap features a sturdy clip for attaching to kayaks, boats, or backpacks.
Is it rugged enough for kayaking and rough outdoor use?
Absolutely. The Boom 3i survived multiple kayak capsizes, 8+ drops onto wooden dock surfaces, sand burial, rain exposure, and constant water submersion without any damage. The rubberized coating, reinforced corners, and IP68 dust/waterproof rating make this genuinely adventure-proof. We used it as our primary water speaker for 3 months with zero issues.
Should I get this or save up for a more expensive speaker?
At the current price, the Boom 3i delivers features and performance that compete with $150-200 speakers. The floating technology alone is worth the price for water activities—no other speaker in this price range offers upright floating playback. The combination of 50W output, 16-hour battery, saltwater resistance, and floating technology makes this the best waterproof speaker under $100 we’ve tested.
Soundcore Boom 3i vs JBL Flip 6: which is better?
The Boom 3i wins for water activities with its floating technology and IP68 rating vs Flip 6’s IP67. The Boom 3i also delivers 50W output compared to Flip 6’s 30W—noticeably louder for outdoor use. For pure sound quality indoors, the Flip 6 has slightly better clarity, but the Boom 3i’s bass response is fuller and more powerful. Choose Boom 3i for water sports, kayaking, and marine use. Choose Flip 6 for general outdoor use where floating capability doesn’t matter.
How to make Soundcore Boom 3i louder?
Download the Soundcore app and enable BassUp 2.0, update to latest firmware, adjust EQ to boost mids and highs, and ensure the speaker is fully charged. For maximum volume outdoors, place the speaker on a solid surface rather than sand or grass—this reflects sound better and increases perceived loudness. You can also pair two Boom 3i units in TWS mode for true stereo separation and significantly increased volume coverage across larger areas.
Is Soundcore Boom 3i worth it?
Yes, if you need a speaker for water activities. At $89 (36% off), the Boom 3i delivers features found in $150+ speakers—specifically the floating technology and 5x saltwater resistance. After 3 months of testing in Lake Michigan, it’s the best waterproof speaker under $100 for kayaking, boating, and beach use. The combination of genuine IP68 waterproofing, 16-hour battery, and 50W output makes it exceptional value. Skip it if you primarily use speakers indoors or need power bank functionality.
OTL Bottom Line: Should You Buy This Waterproof Speaker?
After months of intensive water testing across kayaking trips, beach marathons, fishing expeditions, and daily outdoor use, the Soundcore Boom 3i proves itself as the best waterproof Bluetooth speaker under $100 for water sports and outdoor adventures.
The industry-first floating technology that keeps the speaker sound-forward in water is genuinely revolutionary—this alone makes the Boom 3i worth considering if you spend time on boats, kayaks, or around pools.
Combined with legitimate IP68 waterproofing, 5x saltwater resistance, and 50W bass-heavy output, you get marine-grade audio performance at a budget-friendly price.
Buy it if: You want a speaker that won’t sink if dropped overboard, need powerful audio for water sports and beach parties, or want legitimate saltwater resistance for marine environments.
Also perfect if you’re replacing older JBL Flip or Charge models and want better features at lower cost.
Skip it if: You need power bank functionality to charge devices, want true 360-degree omnidirectional sound, or primarily use speakers indoors where floating capability doesn’t matter.
For comprehensive waterproof audio solutions, pair your Boom 3i with gear from our best waterproof action cameras guide.
Ready for Speakers That Actually Float?
This guide was last updated in October 2025 with current pricing and features. Tested in Northern Michigan by Outdoor Tech Lab.
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