sound driver 24 is in the range of two and one half inches to two and three quarter inches the height c of chamber 28 taken from plate 32 to plate 34 is in a range of three and one quarter inches to three and three quarter inches preferably being three and one half inches the heights of chambers 26 28 are related to sound frequencies and must not be varied even if other dimensions of speaker 10 are varied it is anticipated that the overall diameter of housing 12 can vary from four and one half inches to twelve inches to accommodate standard commercially available sound drivers having overall nominal diameters of four inches six inches eight inches and twelve inches in the preferred embodiment speaker 10 utilizes sound drivers having overall nominal diameters of four inches in the latter case the preferred embodiment housing 12 has length in a range of six to seven inches preferably six and one half inches and has a diameter in a range of four to five inches preferably four and one half inches turning now to fig3 the electrical components of fig1 are modified to enable a user to select the source of speaker input signals by a two position switch 56 illustratively speaker input signals are selectively derived from a radio receiver 2 and a personal computer 4 sound drivers 20 24 and crossover network 36 are similar to those of the embodiment of fig1 and are connected similarly however switch 56 is interposed between input terminals 58 60 62 64.