Acoustical Safety - Martin Audio ASX User Manual

4

Acoustical safety

Minimum audience/staff distance
Please be aware that the ASX ultra high performance active subwoofer has been designed
for use in large scale installations. The ASX is capable of producing a sound pressure level
of 152dB at 1m from its grille when driven to full power.
Sound pressure in excess of 140dB spl – however short the exposure time - may cause
permanent hearing damage. A minimum listener distance of 4m for audience or staff is
strongly recommended.
Maximum pk spl limiters
Where a minimum listener distance of at least 4m is not feasible, we recommend limiting the
maximum peak sound pressure level by loading an ASX preset with the appropriate peak
limiter reduction.
System limiters should be set by an experienced sound system engineer.
Preset pk limiter reduction
0dB (as shipped)
-6dB presets
-12db presets
Note that the minimum listening distances quoted in this section are to protect the listener
from single instances of maximum peak output only.
If in doubt, please email
All material © 2009. Martin Audio Ltd. PRELIMINARY
Maximum spl at 1m
152dB peak spl
146dB peak spl
140dB peak spl
info@martin-audio.com
Safe listening distance for
for further advice.
single peak
4m
2m
1m