Portable Speaker Specs, Watts and IPX7
Watts say little about how loud a portable speaker plays unless you know how they were measured; an IP rating like IPX7 shows its water resistance.
By Andrian ChengContributing writer.
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The short answer
Two numbers on a portable speaker's box matter most and are the easiest to misread:
- Watts: the power the amplifier can deliver. More watts can mean louder, but only if you know how the figure was measured.
- IP rating: a code like IPX7 or IP67 from the international standard IEC 60529. It says how well the speaker keeps out dust (first digit) and water (second digit).
How many watts is a good Bluetooth speaker?
There is no single right number, for three reasons.
The measuring method changes the figure. A continuous (often called RMS) rating describes power the amplifier can sustain. A "peak" or PMPO figure has never been defined in any standard, so makers use different methods and there is no way to convert it to continuous power. A big PMPO number on a small speaker tells you very little.
In the US, there is a rule for this. The Federal Trade Commission's Amplifier Rule says that when a maker advertises the power output of sound amplification equipment, it must also show a rated power measured under the rule's test conditions, labeled "FTC Power Output Rating". When you compare speakers, compare that rating, not a peak figure.
Loudness does not grow in step with watts. Perceived loudness follows a logarithmic curve. Roughly, a 10 dB increase sounds about twice as loud, and that takes about ten times the acoustic power. Doubling the power adds only about 3 dB. So a speaker with twice the watts of another will not sound twice as loud. How efficiently the driver turns power into sound (its sensitivity) matters just as much.
The practical approach: compare continuous ratings between speakers of a similar size, and read the maker's figures for battery life and sound at the volume you actually use.
What does IPX7 mean?
An IP code has two digits after "IP":
| Digit | Protects against | Levels that matter for speakers |
|---|---|---|
| First | Solid objects and dust | 5: dust protected; 6: dust-tight |
| Second | Water | 4: splashing; 5 and 6: water jets; 7: immersion up to 1 meter; 8: deeper immersion set by the maker |
An X means that part was not tested or no rating is given. So IPX7 means the speaker passed the immersion test (up to 1 meter for 30 minutes) but has no dust rating.
Two details catch people out:
- The ratings are not cumulative above 6. An IPX7 speaker has not necessarily passed the jet tests for IPX5 or IPX6. Products that pass both list both, such as IPX5/IPX7.
- Testing uses fresh water. Salt water, pool chemicals and drinks are not covered by the rating.
IPX7 vs IP67
The water part is the same: both pass the 1 meter, 30 minute immersion test. The difference is dust. IP67 adds the top dust rating (6, dust-tight), which matters on a beach or a trail. Apple, for example, rates its AirTag IP67 and spells it out as a maximum depth of 1 meter for up to 30 minutes. Ultimate Ears rates its Wonderboom 4 speaker IP67 and lists 14 hours of playtime. Apple also notes that water and dust resistance can decrease with normal wear, so do not treat a rating as a promise for life.
Portable speakers on Wiki Shopping
Of the 89 portable speakers and audio docks listed on Wiki Shopping on October 26, 2026, 60 are portable Bluetooth speakers; the other 29 do not state a type. Browse them under cell phones and accessories.
How we count
Speaker types are read from each store listing. The counts change as listings are added or removed.