Vox Line Source 15 (LS15) column speakers for Public Address

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Vox Public Address speaker units 1964 - 1969

LINE SOURCE 15 SPEAKERS

Vox catalogue item no. 075

Promotional picture, 1964.

Vox Line Source 15 speakers were first introduced by JMI in late 1963 / early 1964, part of a new range of Public Address equipment developed to meet the needs of groups, clubs, factories, theatres, church halls, and so.

The speakers were developed in parallel with the larger Line Source 40 units - see this page.

LS15 speakers were 30 inches tall, 8 inches wide, 6 inches deep, and contained five 5" Elac or Goodmans drivers wired in series for a total impedance of 15ohms (5 x 3ohms). Elacs are more common. The columns were sold singly or in pairs.

The amplifier best suited to driving one LS15 was the Vox M.C.15 - a Metal Clad 15 watt Public Address amp with a sloping front. For two LS15s, Vox had the M.C.30 - 30 watts. A number of Vox 30 watt PA sets were formed, however, from MC30s or AC30 Super Twin amplifier sections paired with two Line Source 40 column speakers.

The earliest LS15 units had perspex logos, as in the image in the catalogue below. Later, gold plastic logos of the type used for various Vox amplifiers were applied - often in the lower right hand corner.

It is likely that the wooden cabinets for the first LS15s were made by P.A. Glock, which was based in Crayford, a mile or so up the road from JMI's Dartford Road Works. By 1967, Heslop and Co., based in Rayleigh, Essex, had taken on the construction of at least some of the cabinets. Heslop was a fellow member of the Royston Group of Companies.

Although relatively few examples have survived, the Line Source 15s were purchased in reasonable numbers. They remained in the JMI catalogue through to 1968, and were still made and offered by "Vox Sound Equipment Limited", the company that succeeded JMI in the late summer of '68.