Tests, tools & research
Vibrator strength: why powerful is not a measurement
Two toys that both advertise ten levels can differ by a wide margin at level one, and nothing in the published data would tell you. This page explains the two quantities that decide how a toy feels, and what a published strength figure would have to carry.
Strength is two quantities, and the industry quotes neither
A vibration has an amplitude, which is how far the surface actually moves, and a frequency, which is how many times per second it moves. Those two numbers together are what your nerves respond to. Brands publish neither. They publish a count of levels, a pattern menu, a motor count and occasionally a wattage, which describes electrical consumption rather than anything that reaches you.
The distinction matters because the two quantities do opposite things. High frequency with small amplitude is the sensation people call a buzz: it is felt in the skin, it numbs quickly and it fades with use in a single session. Lower frequency with large amplitude is what people call rumble: it is felt deeper, through tissue, and it tends not to desensitize as fast. Most disappointed purchases in this category are a rumble expectation met by a buzz.
A single number for strength therefore cannot be honest unless it says which of the two it is describing, and at what setting.
What the published claims actually mean
- Number of levels or speeds. A count of positions in the firmware. It says nothing about where the first one starts or where the last one ends, and the steps are frequently not evenly spaced.
- Patterns. A pulse program. Useful to some people and irrelevant to strength. A long pattern list is cheap to add and often used to pad a specification sheet.
- Watts or voltage. Electrical input, not output. A badly matched motor can draw more and deliver less.
- Revolutions per minute. Occasionally quoted for rotating mass motors. Closer to useful than a level count, but it describes the motor unloaded, and the figure collapses once the head is pressed against anything.
- Strongest on the market. A comparative claim with no comparison published. It appears on dozens of listings at once, which is the clearest evidence that none of them is measuring.
Motor type predicts character better than any number brands publish
Most toys use an eccentric rotating mass motor: a weight off center on a spinning shaft. Frequency and amplitude are coupled in that design, so turning it up makes it both faster and harder, and the low, large movement people want is difficult to reach. These motors are cheap, reliable and the reason so much of the category buzzes.
A linear motor drives a mass back and forth instead of spinning it. That decouples the two quantities and makes a low frequency with real amplitude possible, which is why the toys people describe as rumbly usually have one. They cost more and are far less often named in a specification sheet.
Mains powered wand motors are a third family, physically larger, and their reputation for depth comes from the amount of mass they can move rather than from anything clever.
None of this is a substitute for a measurement. It is a usable proxy while measurements do not exist, and a brand that names its motor type is giving you more real information than one quoting a level count.
The method results on this page will follow
A rig, not a hand
The toy clamped in a stated fixture with the accelerometer bonded at a stated point on the contact surface. A hand damps vibration heavily and differently every time, which makes hand held figures unrepeatable by construction.
Amplitude and frequency reported separately
A spectrum per setting rather than one headline number, so a deep low component and a thin high one cannot be averaged into the same figure. The dominant frequency and the peak amplitude are both published.
Every setting, free and under load
Each step unloaded, then the same steps with a stated force applied through a stated compliant material. The gap between the two is the most useful fact about a motor, and it is the one no listing contains: some toys lose most of their output the moment they are pressed.
Repeats, several units, and a stated tolerance
Three runs per setting, more than one unit of a model where possible, and the accelerometer and fixture tolerance printed with the table. Production runs change, and a single unit cannot speak for a model.
No ranking without the raw figures
If a number cannot be published, the ordering derived from it will not be published either. A league table whose underlying values are withheld cannot be checked.
What to use in the meantime
- Look for the motor type, not the level count. A named linear motor is a meaningful disclosure. Ten levels is not.
- Read owner language for the axis that matters. Buzzy, surface, tickly and numbing on one side, deep, thuddy, rumbly and heavy on the other. Those words are reported experience and they separate the two families reliably.
- Weigh the toy if you can. Moving a large mass needs a large mass, and depth correlates with weight more honestly than with any published figure. A very light toy promising earth moving depth is promising something its physics makes difficult.
- Check what happens under pressure. The most common complaint pattern in owner feedback is a toy that feels strong in the air and disappears when pressed. If several owners describe that, believe them.
- Treat pattern counts as neutral. They are not strength, they are software, and a long list is often there to fill the box.
Questions people ask
- Is stronger better?
- No, and this is the most common framing error in the category. A great deal of the category is sold on maximum output, while the complaint that recurs most in owner feedback is a first step that is already too intense. A wide usable range, especially a genuinely gentle bottom end, is worth more than a higher ceiling to most people.
- Why does a toy feel weaker after a few minutes?
- Nerve endings adapt, and they adapt fastest to a constant high frequency. That is the physiological reason rumble is preferred by people who use a toy for longer, and the reason varying the setting works better than reaching for maximum.
- Do two motors mean twice the strength?
- No. Two motors mean two locations, which can matter a great deal for a toy that has to reach two places at once. Output is set by each motor, and a dual motor toy sometimes runs both at a lower level to protect its battery.
- Is a mains powered wand always stronger than a rechargeable one?
- Not always, although the mains family does hold most of the deep end, because a cable removes the energy budget that shapes every design decision in a battery powered toy. Modern rechargeable wands have closed much of the gap and the better ones are chosen for that reason.