Page 1
INSTRUCTION BOOK
FOR LUBELL
LL916
UNDERWATER SPEAKER
LUBELL LABS INC.
21 NORTH STANWOOD ROAD
COLUMBUS, OHIO 43209 U.S.A.
(614) 235-6740
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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.
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SPECIFICATIONS: Lubell
LL916
U/W Speaker
17
lbs.
Shipping Weight:
14
lbs.
Net Weight:
9.0" diameter x 5.50" axial length
10.750"H x 10.750"W x 7.750"D
Dimensions:
Speaker:
Cage
:
5' minimum - 50' maximum
Speaker Operating Depth:
180db/uPa/m
@
1kHz
Output Level:
Omni-directional
200Hz-2kHz
Slight scalloping
2
kHz
-20kHz
Directivity:
20-volts
rms
Maximum Speaker Cable Voltage:
200Hz
-
20kHz
Frequency Response:
SPECIFICATIONS:
AC205B/C
3.0
lbs.
Shipping Weight:
2.25
lbs.
Net Weight:
5.0"L x 3.5"W x 2.25"H
Dimensions:
AC205B:
Screw terminal in/out
AC205C:
Screw terminal in,
4182-3SG-300
out
Connectors:
20 V
rms
Output Voltage:
25 V
rms line (or 75 watts @ 8 ohms)
Input voltage:
16 ohms (with
LL916
connected)
Impedance (nominal):
50Hz
-
20kHz
Frequency Response:
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INSTALLATION & OPERATION
The Lubell Labs model
LL916
underwater speaker is a precision instrument that deserves careful
handling. The following simple rules will serve as a guide to achieving maximum life:
1
.
CAUTION!
Carefully inspect the underwater speaker cable before each use, and do not
use if damaged. Do not attempt to open and self-repair the
LL916
as this will void the
warranty. If speaker cable needs replacement, please return the unit to us for low cost
replacement. Please contact your installing dealer for questions regarding service, or
call Lubell customer service at (614) 235-6740 between
8:30-17:00est
.2.
CAUTION! Always vacate the water during electrical storms or inclement weather.
3
.
CAUTION!
Be sure that your amplifier is connected to a
GFCI
protected AC outlet
only, and is installed indoors on a shelf or in a vented equipment rack in an area with
low humidity. If the amplifier will be used portably, it must be kept on a stationary
wooden equipment table indoors with a minimum distance of 10' away from the water.
4.A
UL813
listed commercial sound amplifier must be selected that provides a 25V constant
voltage speaker output. Allow 37.5 watts power consumption for each
LL916
/AC205
connected to the 25V line. We recommend Peavey
UMA75
2
mixer/amp or
IPA75
2
power
amp (75 watts) to power one or two
LL916/AC205
’s;
Peavey
UMA1502
mixer/amp or
IPA150
2
power amp (150 watts)
for three or four
LL916/
AC205
’s
;
Peavey
IPA300T
for five
to eight
LL916/
AC205
’s.5.Connect
AC205B
/C
transformer box(es) in parallel and in phase to the “25V” speaker output
terminals on amp
.
AC205B
box(es) must be located indoors, and may be located by the
amplifier, or located closer to the
OP1
jack plate(s) providing lower loss for long cable runs.
Do
not
use
L-pad
or
autoformer
between the underwater speaker(s) and the amplifier
. If
remote volume control is needed
, use the “remote volume” pot co
n
nection on the Peavey
UMA
series mixer
, or insert a
Crestron
type volume controller between the source device
(receiver, pre-amp, CD/tape) and the Peavey
UMA
amplifier’s stereo
tape/aux
input.
6.The
OP1
connector plate fastens to a single-gang all-weather
J-box
,
which should be
mounted at least 8” above the deck to a cabana wall or wooden post by the pool. For single
speaker installations, center the
J-box
on the length of the pool where the U/W speaker will
be placed; Run 1/2” conduit from this box back to the house
. For two speaker installation
s,
mount each
J-box
on a post ¼ pool length from each end of the pool
and run 1/2” conduit
between
J-box
es
,
and 1/2” conduit from one box back to house.
Install 14 gauge 2 conductor
speaker wire in the conduit between each transformer box an
d
OP1
jack plate. Connect one
end (of each pair) to
“LL916”
terminals
(B=black,
W=white)
on
AC205B
transformer box
and other end to
OP1
connector plate’s black and white wires. Connect the green ground
wire from each
OP1
connector to a good ground using #8 copper.
7
.
Take good care of the U/W speaker cable, as it is not covered under the guarantee. Do not
use the speaker cable to lift, lower, or support the underwater speaker. Instead attach a sturdy
1/4" nylon cord to the speaker cage for this purpose. Lower the speaker to a 6’ (1.83 meter)
Page 5
depth, or place on the bottom of the pool. Experiment with position/rotation of speaker until
best pool coverage is obtained.
8
.
Remove the underwater speaker(s) from the water after each use
, and store in dry cabinet.
Do not leave the speakers in the water, as automatic pool cleaner will damage the cable
.
Avoid scraping the speaker, as damage to the coating will result in eventual failure. If speaker
is stored for prolonged periods, a white film
(plasticizer
)
may appear on the speaker or cage
.
This is normal -- film may be washed off using a sponge and warm soapy water.
SYSTEM APPLICATION
These remarkable sets are a decade ahead of their time. Many engineers and scientists working
in the field of underwater acoustics are still unaware of the feasibility of compressing the size of
a low-frequency transducer without reducing it's efficiency; or of the feasibility of driving a
piezoelectric transducer over broad-band frequencies using common transistor amplifier
circuitry. A partial list of current uses follows:
Swimming & Scuba Instruction
G
unlap
and false start signal, competitive swimming
Recall of scuba divers to excursion boat or habitat
Paging of scuba divers & swimmers at popular resorts
NASA training facilities
Military and scientific research
Interrogation of suspicious divers by law enforcement
Communication during filming of movies with underwater scenes
Coordinating underwater work parties
Coordinating underwater explorations
Coordinating underwater treasure hunts
Training of killer whales, dolphins, and other species
Repelling/attracting Beluga whales, sharks, dolphins, manatees, and other species, away from
atomic test site
s, hydroelectric facilities, fishing nets, oil/chemical spills,
intercoastal
waterways,
and other potentially dangerous situations.
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OBTAINING SERVICE
No user serviceable parts are contained in the
LL916
underwater speaker,
AC205
transformer
box, or the Peavey
UMA
or IPA series amplifiers.
Should your speaker or transformer box require service, please contact your installing dealer or
call Lubell Labs at (614) 235-6740 between
8:30-17:00est
for return instructions. If the Peavey
amplifier requires service, please contact Peavey AA-repairs at (601) 483-5376 for a return
authorization number and return instructions.
Please include a packing list (itemize contents), description of problem, your return address, and
phone numbers to reach you at. Most repairs can be performed within 2 weeks. You will be
contacted with an estimate prior to repair unless specified otherwise.
LIMITED WARRANTY
Lubell Labs warrants the
LL916
and the
AC205
to be free from defects in material and workmanship,
under normal use and service, for a period of five years from the date of delivery to the first
user-purchaser.
During this warranty period, the obligation of Lubell Labs is limited to repairing or replacing, as Lubell
Labs may elect, any part or parts of such product which after examination by Lubell Labs discloses to be
defective in material and/or workmanship.
Lubell Labs will provide warranty for any unit which is delivered, transported prepaid, to the Lubell Labs
factory for examination and such examination reveals a defect in material and/or workmanship.
This warranty does not cover travel expenses, the cost of specialized equipment for gaining access to the
product, or labor charges for removal and
re-installation
of the product. Not covered under the warranty:
speaker
burn-out,
cord or connector damage, coating damage and subsequent speaker corrosion.
This warranty does not extend to any unit which has been subjected to abuse, misuse, improper
installation, or which has been inadequately maintained; nor to units which have problems relating to
service or modification at any facility other than the Lubell Labs Factory.
THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT
LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL LUBELL LABS BE LIABLE FOR ANY LOSS OF
PROFITS OR ANY INDIRECT OR CONSEQUENTIAL DAMAGES ARISING OUT OF ANY SUCH
DEFECT IN MATERIAL OR WORKMANSHIP.
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