Short answer: the Marshall Willen II on measured sound quality, the Monster Bluetooth Speaker on price. The Marshall Willen II ranks #11 of 47 small speakers at $129.99. The Monster Bluetooth Speaker ranks #31 at $19.99, $110 cheaper.
What the Marshall Willen II offers: More balanced than the first Willen, no sharp treble Watch for: Not that deep of bass. Fairly low max output vs pricier speakers; midrange can sound a bit congested at volume. No aux input.
What the Monster Bluetooth Speaker offers: A very light, IPX7-rated mini speaker with USB-C charging, aux and microSD playback, speakerphone support and TWS pairing. It is a convenient rugged travel speaker when water resistance and small size matter more than bass. Watch for: Its tiny 36mm driver has very limited bass (about 95Hz at -10dB), elevated mids and rolled-off highs. It cannot deliver the scale, detail or battery endurance of stronger small-speaker rivals, and no app or EQ is available to improve the tuning.
Buy the Marshall Willen II when sound quality outweighs the price for you, and the Monster Bluetooth Speaker when the price outweighs sound quality instead.
Battery life favors the Marshall Willen II: rated for 17 hours against 6.5 hours for the Monster Bluetooth Speaker.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Willen II | Monster Bluetooth Speaker | |
|---|---|---|
| Price | $129.99 | $19.99 |
| Ranked | #11 of 47 in Small Size Portable Bluetooth Speakers | #31 of 47 in Small Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 70Hz | 95Hz |
| Battery Life | 17 hours (Manufacturer specified) | 6.5 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | No |
| IP Rating | IP67 | IPX7 |
| Party Mode | No | No |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Pointing up |
| TWS | No | Yes |
| Weight | 0.8 lbs (360 g) | 0.4 lbs (185 g) |
| Aux Input | No | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 5.3 | - |
| Frequency Response | 75Hz - 20kHz (Manufacturer specified) | - |
| Charging Time | 2.5 hours | - |
| Drivers | 2" (51mm) full-range with dual passive radiators | 1.4" (36mm) full-range driver |
| Dimensions | 3.9" x 1.7" x 3.9" (99 x 43 x 99 mm) | Specifications vary by model |
| Amplifier Power | 10W | 5W |
| Digital Aux Input | No | No |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for Marshall Willen II:
- Tribit Stormbox Micro 2 vs Marshall Willen II
- Soundcore Boom Go 3i vs Marshall Willen II
- Tribit Stormbox Micro vs Marshall Willen II
- Marshall Willen II vs Tribit Stormbox Micro 3
- Teufel Boomster Go vs Marshall Willen II
Prices on this page were last checked September 16, 2026 at 12:41 AM UTC. Product prices and availability are accurate as of that date/time 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.
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The Two Speakers In Full
Marshall Willen II: $129.99 Amazon eBay
Pros: More balanced than the first Willen, no sharp treble. Measured bass extension of 70Hz (-10dB).
Cons: Not that deep of bass. Fairly low max output vs pricier speakers; midrange can sound a bit congested at volume. No aux input.
Full Marshall Willen II review and specifications →
| Amplifier Power | 10W |
|---|---|
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 70Hz |
| Battery Life | 17 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Charging Time | 2.5 hours |
| Digital Aux Input | No |
| Dimensions | 3.9" x 1.7" x 3.9" (99 x 43 x 99 mm) |
| Drivers | 2" (51mm) full-range with dual passive radiators |
| EQ | Yes |
| Frequency Response | 75Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Omnidirectional | Pointing up |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| TWS | No |
| Weight | 0.8 lbs (360 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- Marshall Willen II vs Soundcore Mini 3 Pro
- Marshall Willen II vs Marshall Willen
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- Marshall Willen II vs Teufel Boomster Go
- See all 31 comparisons
Monster Bluetooth Speaker: $19.99 Amazon eBay
Pros: A very light, IPX7-rated mini speaker with USB-C charging, aux and microSD playback, speakerphone support and TWS pairing. It is a convenient rugged travel speaker when water resistance and small size matter more than bass. Measured bass extension of 95Hz (-10dB).
Cons: Its tiny 36mm driver has very limited bass (about 95Hz at -10dB), elevated mids and rolled-off highs. It cannot deliver the scale, detail or battery endurance of stronger small-speaker rivals, and no app or EQ is available to improve the tuning.
Full Monster Bluetooth Speaker review and specifications →
| Amplifier Power | 5W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 95Hz |
| Battery Life | 6.5 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | Specifications vary by model |
| Drivers | 1.4" (36mm) full-range driver |
| EQ | No |
| IP Rating | IPX7 |
| MicroSD Playback | Yes |
| Omnidirectional | Pointing up |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 0.4 lbs (185 g) |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
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