user manual
TFS-780
TFS-780 user manual
Page 23
Bass Enclosure arraying
Flashlight bass enclosures are most efficient when ground stacked in a block. Not only do
they benefit from improved coupling when there are no air gaps between them, but they also
couple to the ground. However, some of this energy may be absorbed by nearby
obstructions such as barriers or a tightly-packed standing audience. Sound pressure levels
may also be excessive for members of the audience if they are able to get too close to the
enclosures. When stacking on the stage or on a platform, particularly outdoors, it is
preferable to close the gap between the platform and the floor with sheets of plywood. This
results in increased sound projection into the audience and less leakage backstage.
Aiming - directivity of the stack
The directivity of the bass stack will depend on its dimensions and curvature. A tall thin stack
will disperse a lot in the horizontal plane and become narrow in the vertical plane and
likewise a wide stack will narrow in the horizontal plane. There is usually an optimum
compromise between the two so that a smooth transition can be obtained between the effect
of the coupling of the two stacks down the centre line of the room and the effect of the
individual stacks beaming on their axis. Also adding some curvature to the stack will help to
increase the directivity of the stack especially in the higher frequencies.
Turbosound Flashlight bass bins can be stacked in various configurations, each giving a
certain emphasis which can be used to great advantage dependent on the room, situation
and type of music.
Stacking in pairs mouth to mouth (access panels outwards) helps the bins to couple giving a
wider mouth area and lower bass response. The example shown below will result in a strong
punchy low end partly due to the floor coupling. This configuration works well for rock
music, giving a solid low end. Stack two bass bins on their ends, with a Floodlight front fill
on top, between two columns of 4 high, 2 wide bass enclosures. Place the onstage columns
flush and parallel with the stage front, turning the offstage colum out towards the side.
