Ok då, här är lite info.
Bilden är från patentet på kolboxen som ansöktes den 27 september 1954.
Fig. 3
"Still another embodiment of the invention, using only one loudspeaker mechanism for the whole frequency range reproduced, is shown in Fig. 3. The main body of the apparatus consists of a
cylindrical casing 10, the axis of which being arranged in vertical position. The
casing 10 is provided with
a cover 11 and a
bottom wall 12. A
sound radiating surface or opening 13 in the cover radiates as weil high audio frequencies as medium and low audio frequencies, i.e. the whole frequency range.
Above said opening 13 of the apparatus is provided
a reflector 14, coaxial with the
opening 13. The reflector, which is connected with the
casing 10 by means of
rods 15, is adapted to reflect high audio frequencies in horizontal directions. Low audio frequencies are radiated through
an opening 16 communicating with the
casing 10 by means of a
tube 17 forming part of a resonator for said low frequencies. According to the example shown
the tube 17 serves as a carrying arm for the
casing 10 and is provided with mounting means so that the whole apparatus can be mounted on
a wall 18".
Den är ju rolig

, men jag tror att den i så fall går att förbättra

och optimalanpassa för surroundhögtalare med muppselement. Med inbyggd lampett kan den bli gullig
MvH
Peter
VD Bremen Production AB + Ortho-Reality AB; Grundare av Ljudbutiken AB; Fd import av hifi; Konstruktör av LICENCE No1 D/A, Bremen No1 D/A, Forsell D/A, SMS FrameSound, Bremen 3D8 m.fl.