Jennings LS410 column speakers (1968-1973)
4 x 10", 15 ohms total impedance, 50W power handling
Detail from Derek Underdown's copy of the Jennings Electronic Developments brochure of early 1969 (certainly in existence by the time of the Frankfurt Trade Fair). Thanks to Toni Standing, Derek's daughter.
One of the key selling points of Tom's line source speakers - page on the LS412 here - was that they were free-standing - "The cabinet is angled at the rear and sloped at the front to stand squarely on the floor". The chrome tilt-back stands of the Vox line source columns could therefore be dispensed with.
That JMI had considered this idea is clear from a design for the Vox Line Source 60 columns (4 x 12" drivers) registered at the Patent Office in London in the summer of 1967.
Photographed autumn 1967. The idea presumably was to build the Vox Line Source 40 column speakers (4 x 10" drivers) along the same lines.
Tom presumably owned the rights to this design and simply turned gave it a new twist, effectively making the front of the Vox columns the back of his new units and (obviously) vice versa.
The Patent applications asserted on the serial number plates - applications 15698 and 58809 - have yet to be traced in the available records. These applications were also asserted in respect of the LS412 columns.
The price of an LS410 in 1968 was £46 each - as referenced in a review of the Jennings stand at the Russell Hotel Trade Fair of August 1968.
Detail from Gary Hurst's review of the show. Material on Jennings in 1968 can be found on this page.
In 1973, the LS410 jumped in price from £50 each (in January) to £55 (quoted in June), then to be deleted from the catalogue. The Jennings range was thoroughly overhauled in the summer - in time for display at the Russell Hotel Trade Fair in August. The column speakers - the LS410 and LS412 - were replaced by 2 x 12" cabinets, with or without horns.
Characteristics
Speakers were either 10" Goodmans or Celestions, 15 ohms apiece, wired in series-parallel for a total impedance of 15 ohms, power handling 50 watts. Serial numbers began at 100.
The cabinet maker was probably Henry Glass, who had done much work for Tom in JMI days.
Serial number 138.