Short answer: the KEF Muo gen2 for better sound quality, the Zealot S61 for the lower price. The KEF Muo gen2 ranks #73 of 136 medium speakers at $249.99. The Zealot S61 ranks #134 at $20, $229.99 cheaper.
What the KEF Muo gen2 offers: KEF seemed to have fixed the rolled off treble and overall balance Watch for: Lacking deeper bass. Very thuddy bass. Appears to be the exact same hardware but with updated tuning. Bass distorts as volume increases, and the claimed 43Hz extension is really only audible at low listening volumes, with a few seconds of lag after volume changes. Loses most of its bass off-axis. Customer reviews are mixed, ranging from praise for detail at low volume to complaints of a boxy, hollow sound.
What the Zealot S61 offers: 20W output, IPX7 waterproof, exceptional 40-hour battery life, Bluetooth 5.2, TWS stereo pairing, compact 665g design, single full-range driver, built-in microphone, AUX input, USB-C charging Watch for: Sounds like a soup can, no bass at all. Weird frequency response all over.
Buy the KEF Muo gen2 if sound quality is the priority over the price, or the Zealot S61 if the price is the priority over sound quality.
If sound quality matters at all to you, skip the Zealot S61. It ranks near the bottom of the 136 medium speakers, so look higher up the list instead.
There is a real battery-life gap here: the Zealot S61 is rated for 40 hours, the KEF Muo gen2 only 24 hours.
Specifications Side By Side
| KEF Muo gen2 | Zealot S61 | |
|---|---|---|
| Price | $249.99 | $20 |
| Ranked | #73 of 136 in Medium Size Portable Bluetooth Speakers | #134 of 136 in Medium Size Portable Bluetooth Speakers |
| App | Yes | - |
| Battery Life | 24 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 KHz 24 bit | - |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Auracast) | - |
| Stereo | Yes | - |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| Weight | 1.6 lbs / 740 g | 1.5 lbs / 665 g |
| Bluetooth Version | 5.4 | 5.2 |
| Drivers | 1x 58x117mm racetrack woofer, 1x 20mm tweeter | 66mm full-range |
| Dimensions | 8.5" x 3.2" x 2.3" (216 x 82 x 59 mm) | 4.1" x 4.1" x 6.7" (103 x 103 x 170 mm) |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) | - |
| Output Power | 40W | 20W |
| Max Volume | 90dB | - |
| Built in Microphone | - | Yes |
| Aux Input | - | Yes |
| Power Input | - | USB-C |
| Power Bank | - | No |
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- JBL Charge 6 vs Tronsmart Mirtune S100
- Sonos Roam vs Sony ULT Field 3
- JBL Charge 2 vs Sonos Roam
- JBL Charge 5 Wifi vs Zealot S61
- KEF Muo gen2 vs Tribit Stormbox Mini
Prices on this page were last checked August 27, 2026 at 10:09 PM 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
KEF Muo gen2: $249.99 Amazon eBay
Pros: KEF seemed to have fixed the rolled off treble and overall balance
Cons: Lacking deeper bass. Very thuddy bass. Appears to be the exact same hardware but with updated tuning. Bass distorts as volume increases, and the claimed 43Hz extension is really only audible at low listening volumes, with a few seconds of lag after volume changes. Loses most of its bass off-axis. Customer reviews are mixed, ranging from praise for detail at low volume to complaints of a boxy, hollow sound.
Full KEF Muo gen2 review and specifications →
| App | Yes |
|---|---|
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 KHz 24 bit |
| Bluetooth Version | 5.4 |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 8.5" x 3.2" x 2.3" (216 x 82 x 59 mm) |
| Drivers | 1x 58x117mm racetrack woofer, 1x 20mm tweeter |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Max Volume | 90dB |
| Omnidirectional | No |
| Output Power | 40W |
| Party Mode | Yes (Auracast) |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.6 lbs / 740 g |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Zealot S61: $20 Amazon Aliexpress eBay
Pros: 20W output, IPX7 waterproof, exceptional 40-hour battery life, Bluetooth 5.2, TWS stereo pairing, compact 665g design, single full-range driver, built-in microphone, AUX input, USB-C charging
Cons: Sounds like a soup can, no bass at all. Weird frequency response all over.
Full Zealot S61 review and specifications →
| Aux Input | Yes |
|---|---|
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.1" x 4.1" x 6.7" (103 x 103 x 170 mm) |
| Drivers | 66mm full-range |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Output Power | 20W |
| Power Bank | No |
| Power Input | USB-C |
| TWS | Yes |
| Weight | 1.5 lbs / 665 g |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons