Tannoy Monitor Red Speakers

The Tannoy Monitor Red series was released in 1958, and produced until 1967. Distinguishing physical features of this model are:

a pressed-steel magnet cover, painted with red hammer-tone stove enamel
a cast chassis basket that is finished in grey hammer-tone stove enamel
a low-frequency driver surround that is corrugated fibre, treated with plasticizer

The Monitor Red was available in three models:

III-LZ (a 10-inch unit)
Monitor Red 12-inch
Monitor Red 15-inch

See also cabinet designs for these drive-units

Tannoy Monitor Red III-LZ (10-inch)
Model designation: LSU/HF/3LZ

Tannoy III-LZ 10-inch drive unit showing the
red magnet cover of the Monitor Red series.

Tannoy III-LZ 10-inch drive units

Tannoy III-LZ crossover unit.

Tannoy Monitor Red 12-inch
Model designation: LSU/HF/12L

Magnet cover of the Monitor Red 12-inch speaker.

A pair of Monitor Red 12-inch units with crossovers.

Tannoy Monitor Red 15-inch
Model designation: LSU/HF/15/L

Above Left: The Monitor 15.

Above Right: Crossovers for the Monitor 15.

Left: Front view of the low-frequency cone, showing the curve-linear shape. The dust cap is too dense to allow the high-frequency horn to be seen. Note the plasticized corrugated surround. The cone resonance is around 30Hz for this model which is higher than that acheived in the later HPD series.

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