Number of Drivers
Number of drivers counts the electrically driven sound-producing units in the stated product.
The count is separate from the number of audio channels and the number of frequency bands. Several drivers can reproduce the same band.
Number of Drivers — Loudspeaker
For a loudspeaker, the count normally describes one cabinet. A speaker with several woofers and one tweeter has more drivers than frequency bands, because the woofers may share a role.
Compare the count with the driver complement and whether the figure describes one cabinet or a pair. Passive radiators should be identified separately from driven units. A larger count does not by itself establish greater bandwidth, output or a more complex crossover.
Number of Drivers — Subwoofer
For a subwoofer, driver count describes the powered acoustic drivers in the enclosure. Several woofers can be arranged on different faces or combined within one cabinet.
Compare actual driven woofer count, not every visible diaphragm. A passive radiator moves acoustically and is not another electrically driven woofer. Keep driver size, excursion and enclosure arrangement alongside the count when assessing the design; count alone does not specify bass extension.
Number of Drivers — Headphone
For headphones, the count applies to one earpiece rather than the pair. Multiple drivers in an earpiece can serve different frequency ranges or operate in a combined arrangement.
Compare per-earpiece counts consistently, and use driver complement to identify the technologies and roles involved. Do not turn two earpieces into a doubled per-ear count or infer independent surround channels from the number of drivers. More drivers alone do not establish better frequency response.