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Stacking Guidelines
The stacking system is rated for a maximum of 12 dV-DOSC enclosures
For stacked systems, the well-defined vertical coverage of dV-DOSC allows little margin for error.
Whether the audience is standing or seated is an important consideration and the system should be
stacked on a riser of suitable height (or on top of subwoofers) so that the system is higher than the
listening level of the first row of the audience. In addition, the entire array should be tilted downwards
to obtain better high frequency penetration into the audience.
If the bottom of the array is too low, the first rows receive too much SPL and audience members
directly in front of the system will shadow the following rows acoustically. An additional technique to
avoid build up for the closest members of the audience is to install the system further upstage – the
initial distance-attenuation loss to the first few rows will help provide better SPL distribution
throughout the entire audience without the need to attenuate the mid or high sections of lower
enclosures (which will affect the overall output of the system). To summarize, the bottom of the
stacked array should be higher than the audience (more than 2 m or 6.5 ft above floor level), with the
lowest enclosure tilted downwards as necessary.
Note: A vertical stack of 4 SB218 subwoofers provide a stacking height of 2.2 m above ground level.
Alternatively, 3 dV-SUBs provide a stacking height of 2.1 m above ground level.
Tilting the system downwards is not necessary for field level distributed systems since the audience is
seated on a tribune gradient and there are reduced shadowing effects. For more details on stacking
procedures, please refer to Section 4.1.
Figure 57: Distributed, field level stacked dV-DOSC systems for stadium sound reinforcement
(sound designers: Ki Sun Choi, Seoul Sound; A. Francais, DePreference)
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dV-DOSC dV-SUB Manual V3.0
June 2005
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