Basics on SPL Documentation

Templates for V-NISSG and DIN 15905-5

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SPL Sense provides value profiles and live screens for the V-NISSG (Switzerland) and DIN 15905-5 (Germany). Which requirements apply to your event is set out in the original documents (below).

Value profiles

Template	Values and thresholds (Notification / Warning / Limit)
VNISSG 93dBA	LAeq 60′: 91 / 92 / 93 · LAeq 5′: – / 92 / 93 · LAFmax 1′: Limit 125
VNISSG 96dBA	LAeq 60′: 94 / 95 / 96 · LAeq 5′: – / 95 / 96 · LAFmax 1′: Limit 125
VNISSG 100dBA	LAeq 60′: 98 / 99 / 100 · LAeq 5′: – / 99 / 100 · LAFmax 1′: Limit 125
DIN 15905-5	LAeq 30′: – / 95 / 99 · LAeq 5′: – / 95 / 99 · LCFmax 1′: Limit 135

The values can be adjusted per measurement, see Value profiles. The matching live screens have the same names as the templates, each also in a variant with leveler display.

Glossary

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Measured values and notation

SPL Sense and SPL Cloud write measured values as is common in acoustics:

Display	Meaning
LAeq 60′	Equivalent continuous level (Leq), A-weighted, over 60 minutes. The “hourly level” of the V-NISSG.
LAeq 5′	the same over 5 minutes
LCeq 1 s	Equivalent level, C-weighted, over 1 second (live value)
LAFmax 1′	highest level, A-weighted with time weighting Fast, within one minute

The letter after the L is the frequency weighting (A, C or Z), followed by the type (eq or Fmax) and then the time. A prime ′ stands for minutes. The unit is always dB.

Measuring point and offset

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Loudest place and measuring position

The limits apply at the loudest place in the audience area. The V-NISSG calls it Ermittlungsort (at ear height), DIN 15905-5 calls it maßgeblicher Immissionsort. The sensor can rarely stand there during an event: in the middle of the audience it would be at risk, and shouting and applause would distort the measurement.

That’s why you measure at another place, the measuring position (DIN: Ersatzimmissionsort). The offset (DIN: correction value) compensates for the difference between the two places. SPL Sense adds it to every measured value so that the displayed and stored values correspond to the level at the loudest place in the audience.

Audience noise

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What counts towards the level?

The regulations differ here:

V-NISSG (Switzerland): everything that can be heard at the loudest place counts: sound system, stage, instruments and also the audience (industry recommendation on the measurement procedure).
DIN 15905-5 (Germany): only the sound of the sound system is assessed. Audience and other sources are Störschall (extraneous noise) and should not distort the result. That’s why the standard recommends a measuring position where the audience hardly matters.

In both cases, the SPL Sense recording contains the total level at the sensor. No setting removes the audience from the stored measured values. How much it counts is therefore determined by your choice of measuring position.