BROWN horn model H.4

This model was introduced in 1925 and was the last in the range to be produced by S.G.Brown. It was the smallest and measured 10.5 inches high with a flare diameter of 7 inches. It was advertised as 'a genuine Brown at the price of a pair of phones'. The cost was 1 pound 10 shillings. This horn used the same driver and metal base as the earlier models but was only available in 2000 ohmn impedance. It was produced in black and brown enamelled finish. This one is brown, and the original paint is flaking off in places, showing the metal underneath. The base and tube are cast aluminium and the flare is spun aluminum. It has a removable plate on the bottom, to access the driver. It has 2 terminals on the back to connect to the radio. There is a small adjustment lever on the top of the base.

This horn required no work, other than replacing 3 missing screws from the base, and adjusting. It works quite well. I have decided not to repaint it, but to leave the original chipped paint.

S.G.Brown of North Acton, London was a specialist manufacturer of headphones and loudspeakers from 1920 to 1925. Brown, the company founder was an active inventor of electromechanical devices, including the Microphone Amplifier which permitted loudspeaker operation from a crystal set without the use of valves. The Brown range of horns used a moving iron, and tuned magnetic reed arrangement, in contrast to the common diaphragm electromagnetic driver in other loudspeakers. The sensitivity of the reed and the thinness of the aluminum cone were advertised as offering greater volume than other designs, but the complexity made them more expensive. The horns were sold throughout Europe, Canada, Australia, South Africa, and Japan.


Horn Loudspeakers by S.G.Brown, Ian L.Sanders, Radio Bygones No.35, June/July 1995, page 13-17

Ray Robinson