Faulkner Phased-Array System

Tony Faulkner Phased Array microphone system 06 SRA
 
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Notes and review of Tony Faulkner's
'Phased Array' microphone system

As a main microphone setup the Faulkner Array belongs with the spaced array stereophonic recording systems, where only the time of arrival difference is involved in the distribution of phantom sources across the loudspeaker base-line.
 
Two figure-of-eight microphones are used, parallel to each other and spaced 20 cm or 7.87 inches apart. However this is not like a modified ORTF microphone system because level difference plays no part. There is no microphone angled outwards.
 
What worries me is that I find it hard to imagine how the full stereo stage from left loudspeaker to right loudspeaker can ever be filled using this microphone array.
With the Faulkner Array only the time of arrival differences can have an effect, given the narrow microphone base-line of 20 cm (8 inches), since level differences with bidirectional microphones will be, at best, marginal. Lateral (from the side) sound sources are always strongly attenuated by the characteristic figure-of-eight pattern.
 
The following sketch shows the microphone setup in front of an orchestra.

 
review 1
 
In this case, at most, only half the loudspeaker stage width will be filled.
 
review 2
 
Even with this large orchestra range (±90° = 180°) the maximum stereo width of direct sound can only ever be half the loudspeaker stage width.
 
That is strange. The time of arrival difference, Δ t, is 0.58 ms (milliseconds) at most,
and the level difference is below Δ L = 1 dB. There must be a strong center signal.

 
If you have any thoughts on this, mail me please:
 
eberhard@sengpielaudio.com
 
More references to Tony Faulkner's Phased Array microphone system:
(The pdf files are readable with Adobe Acrobat Version 6 and later)
 
Tony Faulkner Phased Array 1 - Introduction
 
Here you get the original 3-pages article in English from
Hi-Fi & Record Review, July 1981:
 
Tony Faulkner Phased Array 2 - article page 1
Tony Faulkner Phased Array 3 - article page 2
Tony Faulkner Phased Array 4 - article page 3
 
 StereoEight

Visualization of Microphone Systems - Faulkner's Phased Array
 
Stereo Recording Angle SRA calculation Δ L and Δ t for stereo microphone arrays - flash
 
Watch the small stage width, which results between the stereo speakers.
 
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