### Strutt Help

%ALCONS Calculation
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**Strutt|Electroacoustics|%AL**_{cons} calculates the articulation loss of consonants as a percentage and inserts the result into the active row of the work sheet.

Strutt implements the formula as:

`%AL_(cons) = (200 \ D_2^2 \ RT^2 \ N_(t ot))/(VQMN_(dir))`

where,

`RT` is the reverberation time, s

`V` is the room volume, m^{3}

`N_(t ot)` is the total number of loud speakers

`N_(dir)` is the number of loudspeaker contributing to direct (early) sound

`Q` is the directivity factor of source

`M` is a specialist modifier (assume M=1 for most situations)

`D_2` is the furthest distance from loudspeaker, m

Comments or suggestions to
strutt@arup.com