Short answer: the Bogasing M4. It ranks #24 of 134 medium speakers at $45.99; the Bose Soundlink Flex 2nd gen ranks #33 and costs $129, so there is not much of a tradeoff to weigh.
The case for the Bogasing M4: Use super bass mode for the most balanced sound. The catch: A bit harsh and thin sounding.
What the Bose Soundlink Flex 2nd gen gets right: Pretty much identical sounding to the 1st gen. Set against that: Not stereo.
Buy the Bogasing M4 if the ranking matters more than the price. Buy the Bose Soundlink Flex 2nd gen if the price matters more than the ranking.
Specifications Side By Side
| Bogasing M4 | Bose Soundlink Flex 2nd gen | |
|---|---|---|
| Price | $45.99 | $129.00 |
| Ranked | #24 of 134 in Medium Size Portable Bluetooth Speakers | #33 of 134 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 54Hz | - |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| EQ | No | Yes (3 band) |
| IP Rating | IPX7 | IP67 |
| Bluetooth Latency | 150ms | - |
| Max Volume | 99dB | - |
| MicroSD Playback | Yes | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| TWS | Yes | Yes |
| Weight | 1.6 lbs / 731 g | 1.3 lbs / 586 g |
| Bluetooth Version | 5.0 | 5.3 |
| Output Power | 40W | - |
| Drivers | 52mm speaker unit | 60mm full-range driver with passive radiators |
| Built in Microphone | - | Yes |
| Party Mode | - | Yes (Bose Party mode) |
| Dimensions | - | 7.9" x 3.6" x 2.1" (201 x 90 x 52 mm) |
| Bluetooth Codecs | - | SBC, AAC, aptX Adaptive |
The Two Speakers In Full
Bogasing M4: $45.99 Amazon
Pros: Use super bass mode for the most balanced sound
Cons: A bit harsh and thin sounding. Default mode has a boosted treble.
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 54Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Latency | 150ms |
| Bluetooth Version | 5.0 |
| Drivers | 52mm speaker unit |
| EQ | No |
| IP Rating | IPX7 |
| Max Volume | 99dB |
| MicroSD Playback | Yes |
| Output Power | 40W |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.6 lbs / 731 g |
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Bogasing M4 Review - vs JBL Charge 5 & Motion Plus - a new contender?
- Alan Ross Reviews: Bose Soundlink Flex vs Soundcore Boost vs Bogasing M4 - cheap or Bose?
- Alan Ross Reviews: Bogasing M4 or Soundcore Boost or Maxsound Plus for $50 champion?? 🤷‍♀️
- Alan Ross Reviews: Tronsmart Element Force review vs Bogasing M4 - cheap speaker 🤑
- Head-to-Head Comparisons
- Links
Bose Soundlink Flex 2nd gen: $129.00 Amazon
Pros: Pretty much identical sounding to the 1st gen
Cons: Not stereo. Warm sounding with overly boosted bass which drowns out midrange detail. Self drains the battery about 10% a week.
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive |
| Bluetooth Version | 5.3 |
| Built in Microphone | Yes |
| Dimensions | 7.9" x 3.6" x 2.1" (201 x 90 x 52 mm) |
| Drivers | 60mm full-range driver with passive radiators |
| EQ | Yes (3 band) |
| IP Rating | IP67 |
| Party Mode | Yes (Bose Party mode) |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 1.3 lbs / 586 g |
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen vs Flex
- Oluv Patreon: Bose Soundlink Flex 2nd gen - sound demo
- Tô Thái Trà Hùng: Unbox & Sound Test - Bose Soundlink Flex 2
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen & Soundcore Motion 300 sound test
- Alan Ross: Hall of Fame classic vs latest Bose tech!
- CEONTHEMAKING: Bose Soundlink Flex 2nd Gen VS Marshall Emberton III - What’s NEW??
- Alan Ross - The Anti Shill!: Small speaker, mighty sound, The Flex gen 2 shatters physics!
- Head-to-Head Comparisons
- Bose Soundlink Flex 2nd gen vs Bose Soundlink Flex
- Bose Soundlink Flex 2nd gen vs JBL Charge 5 Wifi
- Bose Soundlink Flex 2nd gen vs Bogasing G4
- Bose Soundlink Flex 2nd gen vs Wisetiger P3
- Bose Soundlink Flex 2nd gen vs Miatone Boompro
- Bose Soundlink Flex 2nd gen vs JBL Charge 6
- Bose Soundlink Flex 2nd gen vs Sony ULT Field 3
- Bose Soundlink Flex 2nd gen vs Minirig 4
- See all 14 comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.