Voigt HC Corner Horn Bass chamber for extending the LF response

Voigt HC Corner Horn

Modified with a bass chamber for extending the LF response.

Introduced in 1935 to provide suitable loading for the Voigt loudspeaker unit at a price considerably lower than that of the full-sized Domestic Corner Horn, the Home Constructor (HC) horn has given excellent results down to 100 c/s, or perhaps a little lower.
To bridge the gap between the performance of these two horns, a bass chamber has now been designed for addition to the HC horn. The principle is similar to that of the big corner horn in that the radiation from the back of the diaphragm is collected and diverted through a branched conduit with outlets near the floor. It is reasonably easy to construct, and blueprints may be obtained, price 7s, 6d., by purchasers of moving coil units.

On test, a very considerable improvement in the bass response was observed, the cut-off having been lowered from 100 to between 45 and 50 cycles. The response in this region is best appreciated on sustained organ pedal notes, though it may be expected to also increase the realism of orchestral performances.

The modified corner horn is supplied complete in birch ply for £7/15/-, and the work of adding the bass chamber to existing horns may be carried out at a cost of £5. 

Here you find 6 models, 6 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Voigt Patents Ltd.; Sydenham