Quick Answer: The Ekrin B37S is Ekrin Athletics’ premium single-motor massage gun for 2026, priced at $329.99 with the same 56 lb stall force ceiling as the standard B37 but a progressive-delivery motor Ekrin rates at up to 30% more power at lower speeds, a 12mm amplitude, 2,000-3,200 RPM across 5 speeds, and an up-to-8-hour battery. The catch: Massage Gun Advice’s independent testing measured 56.8-63.3 dB of noise — 5 to 8 dB above Ekrin’s own advertised 35-55 dB range, a real gap between the spec sheet and what you’ll actually hear.
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The B37S is the sibling that’s easy to miss: it sits between the standard B37 and the flagship Kestrel in Ekrin’s five-gun lineup, and unlike its three siblings it never got its own dedicated breakdown on this site. Here’s what the extra $100 over the B37 actually buys — and the one spec where Ekrin’s marketing doesn’t match independent test results.
Ekrin B37S at a glance
| Spec | Ekrin B37S |
|---|---|
| Amplitude | 12mm |
| Stall force | 56 lb (progressive: ~36 lb at speed 1 to 56 lb at speed 5) |
| Speeds | 5 (2,000-3,200 RPM) |
| Noise (advertised) | 35-55 dB |
| Noise (independently tested) | 56.8-63.3 dB |
| Battery | Up to 8 hrs (2550mAh Samsung cell; ~6-7 hrs measured) |
| Attachments | 6 heads + force-meter feedback + locking heads |
| Warranty | Lifetime (registered customers) |
| Price | $329.99 |
| Best for | Slow-speed, high-pressure sessions |
What the Ekrin B37S gets right
More usable force at the speeds people actually use. The standard B37’s 56 lb ceiling only shows up at its top speed; independent testing found the B37S delivers roughly 36 lb even at its lowest setting, climbing to the same 56 lb maximum — a flatter curve that means more pressure without cranking the speed all the way up. That’s the real substance behind Ekrin’s “up to 30% more power at lower speeds” claim.
A bigger attachment kit with real feedback. Six heads plus a force-meter display and locking heads, versus the standard B37’s four heads and no feedback display — useful for anyone tracking pressure across sessions rather than guessing.
A longer rated battery. Up to 8 hours from a 2550mAh Samsung cell, an hour or two more than the standard B37’s 5-6 hour rating, even though Massage Gun Advice’s real-world test landed closer to 6-7 hours.
The same lifetime warranty as the rest of the lineup. Register within 30 days and the B37S is covered for life, alongside a 30-day money-back guarantee — the same standout coverage that applies across every Ekrin gun, including the cheaper B37.
Where the Ekrin B37S falls short
Louder than the spec sheet says. This is the one that matters most: Ekrin advertises 35-55 dB, but Massage Gun Advice’s independent sound testing measured 56.8-63.3 dB across the speed range — 5 to 8 dB above the top of the advertised band. Decibels are logarithmic, so that gap is clearly audible, not a rounding error. If quiet operation is a priority, this is worth knowing before you buy, and it’s louder than the Hypervolt 3 Pro’s published 51 dB.
No higher stall-force ceiling than the cheaper B37. Despite the $100 upcharge, the B37S doesn’t beat the standard B37’s 56 lb maximum — the upgrade is entirely about delivery curve, battery, and attachments, not raw top-end power.
Same 12mm amplitude as the base model. Buyers chasing deeper stroke length should look at the Kestrel’s 13mm or the Theragun Pro’s 16mm instead — the B37S doesn’t move the needle on amplitude at all.
Ekrin B37S vs the alternatives
| Massage gun | Best for | Amplitude | Stall force | Noise (tested) | Price |
|---|---|---|---|---|---|
| Ekrin B37S | Low-speed, high-pressure work | 12mm | 56 lb | 56.8-63.3 dB | $329.99 |
| Ekrin B37 | Best value in the lineup | 12mm | 56 lb | Not independently tested | $229.99 |
| Ekrin Kestrel | Deepest stroke in the Ekrin line | 13mm | 55+ lb | Not independently tested | $349.99 |
| Theragun Pro (Gen5) | Deepest published amplitude | 16mm | ~60 lb | Not published | $529.99 |
- B37S vs B37: $100 buys a flatter force-delivery curve, 2 more attachments, and a couple extra hours of rated battery — not a higher stall-force ceiling. Most buyers save the $100 and stay with the B37.
- B37S vs Kestrel: $20 more gets you 1mm of extra amplitude and a sixth speed on the Kestrel — a closer call than B37S vs B37, but still a marginal upgrade.
- B37S vs Theragun Pro: the Pro’s 16mm amplitude and OLED force meter cost $200 more and only a 1-year warranty, against the B37S’s lifetime coverage.
See the full Ekrin lineup for the B37, Kestrel, Bantam, and 365, or the complete field in our best massage gun ranking.
Who should buy the Ekrin B37S?
Buy it if: you regularly work at slow speeds with heavy pressure — sports-massage-style sessions on dense tissue like glutes and quads — where the flatter force-delivery curve genuinely helps, and you want the bigger attachment kit and force-meter feedback.
Skip it if: noise matters to you (the tested 56.8-63.3 dB runs louder than most guns at this price), or you’re not sure you need the low-speed power boost — in which case the standard B37 delivers the same top-end stall force and amplitude for $100 less.
Ekrin B37S by the numbers
| Spec | Figure | Source |
|---|---|---|
| Stall force (progressive) | ~36 lb (speed 1) to 56 lb (speed 5) | Massage Gun Advice independent testing, 2026 |
| Noise, advertised vs tested | 35-55 dB advertised vs 56.8-63.3 dB tested | Ekrin published specs vs Massage Gun Advice testing, 2026 |
| Battery, rated vs tested | Up to 8 hrs rated vs ~6-7 hrs tested | Ekrin published specs vs Massage Gun Advice testing, 2026 |
| Price vs Ekrin B37 | $329.99 vs $229.99 | Ekrin list pricing, 2026 |
The bottom line
The Ekrin B37S delivers exactly what its $100 premium over the standard B37 promises — a flatter stall-force curve for low-speed, high-pressure work, a bigger attachment kit, and a longer rated battery — all backed by the same lifetime warranty across Ekrin’s lineup. But it’s also genuinely louder than Ekrin advertises: independent testing measured 56.8-63.3 dB against a published 35-55 dB range, a gap worth weighing if quiet operation matters to you. For most buyers, the standard B37 still covers 90% of the same ground for $100 less; the B37S earns its price only if you specifically live at the slow-speed, deep-pressure end of the spectrum. See the rest of Ekrin’s current lineup in our Ekrin massage gun review, or compare the full field in our best massage gun guide.