A distinctive feature of the proposed device for audio playback (see picture) is the introduction of the acoustic load of the dynamic diffuser head on a closed volume formed by the cavity between the two facing one another diffusers two identical drivers in direct radiation included antiphase.
Due to this design the loudspeaker increases the rigidity of the diffuser in the so-called reciprocating range of the head and, in addition, improves transient response of the loudspeaker.
There are several options for building a loudspeaker using this principle (Fig. a and b).
FRG patent No. 2906002
Authors: Bezold D., Schutz, R., Heisler V.; Publication: N. Bolshakov, rf.atnn.ru