A dual loudspeaker has two drive units - one for bass and one for treble, fed via a crossover unit that separates the bass and treble signals.
A dual-concentric loudspeaker has the two drivers (bass and treble) mounted co-axially. The benefits being a frequency response and phase response that is not affected by nodal-cancellation found in normal multi-way speakers. This limitation in conventional multi-way speakers cannot be avoided.
There are a number of famous designs based on the dual-concentric principle, including Stentorian, KEF, the RCA "LC1A", and the famous Altec 604-series (released by Altec Lansing in the USA after the Second World War).
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