Symetrix 571 SPl, Руководство пользователя

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Sports Facilities
Sports facilities can also benefit from the 571. Typically, the 571 is used to track the ambient conditions
on the concourses, other access areas, and the refreshment stands. Consider using multiple 571’s to
isolate specific environments from each other, such as the refreshment stands from the concourse
environment.
Race Tracks
Different race tracks have different noise sources. In auto racing, the cars make far more noise than the
spectators. If you’re going to use a 571 in a speedway installation, position the sensing mikes so they
are in a good spot to pick up the cars. Since this is outdoors, some sort of weatherproof microphone is
needed. A reasonable substitute is a small paging speaker, with a 70V transformer. Use a moderate
transformer tap, like 10 watts. You may even be able to do away with the transformer. Tie the sense mic
cable shield to the case of the speaker (or float it if it’s plastic!).
In horse (and dog) racing, the spectators make more noise than the animals. In this case, position the
sensing mics to pick up the spectators. If the sense mic location is sheltered, then the weatherproofing
needed for auto race tracks isn’t necessary, although it is a good idea to find a location and mounting
arrangement that is at once people-, bird-, and rodent-proof.
Off-Track Betting Parlors and Casinos
In these facilities, the crowd reaction is likely to be sudden and intense. For the betting parlor, it’s a
good idea to include the remote-track audio in the 571’s input signal so that the unit doesn’t consider it
part of the crowd reaction.
In the betting parlor, use directional sensing mics placed to favor the audience. You may need to use the R
ATIO
control to help overcome the leakage from the sound system into the sensing mics.
In casinos, be sure to place the sensing mikes up high where they hear an average of the crowd
and the slot machines. Use longer averaging times.
Restaurants, Bars & Theme Stores
All of these establishments have one thing in common: they all use background or foreground music as
an integral part of their ambience. The volume level of the music is important: audible, but not too loud.
The 571 allows management to determine the appropriate music volume level at a given ambient noise
level. The 571 also helps guarantee the audibility of the music, regardless of actual conditions during
operation. Again, picking the right sense mic location is the key. In a restaurant, keep it away from the
kitchen and away from the entry areas. Definitely avoid espresso machines and vending machines..
In bars and lounges, several mics work better than one or two, since they help average the overall noise
level of the space. Stay away from the blenders and dishwashers behind the bar. Remember that any
extraneous sound sources (like the TV in a sports bar) will be regarded as extra ambient noise by the 571
and the sound system level will increase as a result. You can avoid this by running the TV audio output
into the music input of the 571, so that the TV audio becomes part of the 571’s program material.
Auditoriums & Hotel Lobbies
Here the 571 keeps track of the ambient conditions in the outer areas such as the lobbies and foyers. If
you have speakers in the rest rooms, these speakers should probably not be under the 571’s control,
since these areas are generally more subdued than the outer areas. Of course, the rest rooms could have
their own 571.
Museums
The 571 can greatly enhance the impact of automated museum exhibits. The 571 monitors the
crowd, and sets the gain accordingly. If there are adjacent exhibits that also produce sound, be
sure to place the sense microphone to favor the local crowd, and to reject the other exhibit.