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The Ionofane came along in 1965 and was produced by Fane Acoustics Ltd. Retailing for £29/8s the model 601 tweeter offered a sensitivity of 95d B at eighteen inches and also formed the high frequency part of the company's model 603 loudspeaker, allied to a 15in bass driver and a 5in midrange.

Possibly the most well known application of the Ionofane however, was in the B&W P2 loudspeaker of the mid 1960s.

er the past two months, we have looked at the ways in which loudspeaker designers have come up with a variety of different ideas in order to maximise the potential of sound reproduction in the home.

The methods considered so far have all been successes, to a greater or lesser extent, but it must be remembered that for every Ferrari or Porsche, there is always a De Lorean!

However, Duddell didn’t even file a patent for his instrument and it never became much more than a novelty.

The phenomenon was not applied to a proper loudspeaker design until 1946 when a French scientist, Siegfried Klein, confined the arc to a small tube and horn-loaded it to increase output.

Finally, the 300 series reduced the range to one standmounter and one floorstander and added real wood veneers.

Sadly, GLL pulled out of the hi-fi loudspeaker market in 1998 and their other businesses gradually declined, before their doors closed for the last time in 2005.

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In their Servo 15 subwoofer Paradigm use an accelerometer to provide feedback to the amplifier about the cone's movement, as do Velodyne with their Digital High Gain Servo technology..

In the end, though, the necessity of regular electrode and control valve replacements and the need for a mains supply to the loudspeaker effectively killed off the bulky Ionofane.

It also didn't help that one of the side-effects of the ionisation of the air that produced the sound was quantities of ozone gas (O)!

Development work took place on the design and Du Kane were granted the patent license in the USA (Plessey were the UK recipients).

The name Ionovac was coined in 1956 and Electro-Voice began marketing the design in 1958.

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