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LL916
UNDERWATER SPEAKER &
AC205
TRANSFORMER BOX
The Lubell Labs Model
LL916
underwater speaker with
AC205
inline
audio isolation
transformer box was designed to meet the need for a quality, high output underwater speaker
selling at a reasonable price. Its patented
broadband
high-output design easily fills large pools
with pleasing, wide range sound. It is as effective for synchronized swimming as it is for
communicating with divers and dolphins in the open ocean.
The
LL916
integrates features from LL Model I and LL Model II prototypes. The piston closure
of the Model I provides ruggedness at a reasonable cost, while the improved acoustic
design of the Model II enhances the quality and quantity of available sound.
The ribbed casting, flanged piston design of the speaker makes possible the attainment of
low-Q
in a small size underwater radiator, while the integral compliance element presents an optimum
load to the driving element.
The shell of the
LL916
serves the dual function of piston radiator and water tight enclosure for
driving element and electronics. Electrical variations are changed to force variations using the
piezoelectric effect. The force variations move the two pistons in unison against the reaction of
radiation resistance and mass. Because of the high impedance of aqueous media, small
excursions of the pistons produce acoustic waves of considerable strength.
The speaker is clad in a rugged 30 mil blue PVC coating with redundant seals, and is
EPDM
shock mounted in a PVC coated stainless steel cage. A 25' heavy duty cord is hardwired to
the speaker and is either terminated with a molded
Conxall
Multi-Con-X
3182-3PG-524
connector
(LL916C3)
or supplied with bare end for contractor termination
(LL916C)
.
Coding:
White (
+)
; Black (-); Green (
ground
)
.
For portable applications, the
LL916C3
is provided with the model
AC205C
audio isolation
transformer box, which has mating
Multi-Con-X
4182-3SG-300
output connector and screw
terminal input. Order stock number
LL916C-T
1.
For semi-portable contractor installation, the
LL916C
3
U/W speaker is provided with the model
AC205B
audio transformer box (screw terminal I/O
) and the
OP1
all-weather jack plate
(
4182-3SG-300
on pigtail). Order stock number
LL916C-T
3
.
The
OP1
plate is installed on a
single-gang
J-box
on a wall or post by the pool
, and conduit/cable is run from this
J-box
to the
AC205B
and amp in the indoor control room. Amplifier selection and connection is discussed in
the installation and o
peration section of this guide.