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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SPECIFICATIONS: Lubell LL916 U/W Speaker
200Hz - 20kHz
20-volts rms
Omni-directional 200Hz-2kHz
Slight scalloping 2kHz-20kHz
180db/uPa/m @ 1kHz
5' minimum - 50' maximum
Frequency Response:
Maximum Speaker Cable Voltage:
Directivity:
Output Level:
Speaker Operating Depth:
Dimensions:
Speaker:
Cage:
9.0" diameter x 5.50" axial length
10.750"H x 10.750"W x 7.750"D
14 lbs.
17 lbs.
Net Weight:
Shipping Weight:
SPECIFICATIONS: AC205B/C
50Hz - 20kHz
Frequency Response:
Impedance (nominal):
Input voltage:
Output Voltage:
Connectors:
16 ohms (with LL916 connected)
25 Vrms line (or 75 watts @ 8 ohms)
20 Vrms
AC205B: Screw terminal in/out
AC205C: Screw terminal in, 4182-3SG-300 out
5.0"L x 3.5"W x 2.25"H
2.25 lbs.
Dimensions:
Net Weight:
Shipping Weight:
3.0 lbs.
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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 UMA752 mixer/amp or IPA752 power
amp (75 watts) to power one or two LL916/AC205’s; Peavey UMA1502 mixer/amp or
IPA1502 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 connection 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 installations,
mount each J-box on a post ¼ pool length from each end of the pool and run 1/2” conduit
between J-boxes, and 1/2” conduit from one box back to house. Install 14 gauge 2 conductor
speaker wire in the conduit between each transformer box and 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)
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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
Gunlap 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 sites, 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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