Lubell Labs LL916 User manual

INSTRUCTION BOOK
FOR LUBELL
SKU#9481
LL916
BASIC SYSTEM
LUBELL LABS INC.
21 NORTH STANWOOD ROAD
COLUMBUS, OHIO 43209 U.S.A.
[phone]

TABLE OF CONT
ENTS
TOPIC:
PAGE:
TABLE OF CONTENTS
. . . . . . . . . . . . . . 1
SYSTEM THEORY & DESCRIPTION . . . . . . . . 2
SPECIFICATIONS:
LL916C3
UW
SPEAKER. . . . . . 3
SPECIFICATIONS:
AC203/4
CIRCUIT MASTER . . . . 3
OPERATION AND MAINTENANC
E . . . . . . . . 4, 5
SYSTEM APPLICATION. . . . . . . . . . . . . . 6
OBTAINING SERVICE . . . . . . . . . . . . . . 7
LIMITED WARRANTY
. . . . . . . . . . . . . . 7
1

LL916C3
UNDERWATER SPEAKER &
AC203/4
TRANSFORMER BOX
The Lubell Labs Model
LL916C3
underwater speaker with
AC20
3/4
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 and lap swimming as it is for
communicating with divers and dolphins in the open ocean.
The
LL916C3
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
LL916C3
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 fitted with a molded
Conxall
Multi-Con-X
3182-3PG-524
connector.
For portable air and underwater sound applications, the
LL916C3
is provided with the model
AC20
3/4
audio isolation transformer box. This box can connect to 4/8 ohm tap of standard
GFCI
protected amplifier, providing that the amplifier power output rating does not exceed 50 watts
rms
(20V
rms)
.
The transformer box has a top mounted .250”
AIR
output jack for an optional 8
ohm air speaker
(
LL
6
T
,
SX80
,
or Impulse 100), a side mounted .250
”
LL98
output jack
for a
Lubell
LL98
U/W speaker
, and a side mounted 3-pin
LL916
output jack for a
lubell
LL916C3
U/W speaker
. (Only one
UW
speaker and air speaker may be connected at a time
.) The
AC203/4’s
efficient
autoformer
AIR
volume control allows adjustment of the air speaker sound
level once the
UW
sound level has been set at the amplifier.
2

SPECIFICATIONS:
LL916C3
Frequency Range . . . . . . . . . . . . . . .
.
200Hz-20kHz
Maximum Cable Voltage . . . . . . . . . 20-volts
rms
Directivity
. . . . . . . . . . . . . . . . . . . . .
Omnidirectional
200Hz-2kHz
slight scalloping
2000Hz-20kHz
Output Level . . . . . . . . . . . . . . . . . . .
180d
B
/uPa/m
@
900Hz
with 20V
rms
applied
Required Operating Depth . . . . . . . . . 5’
minimum
,
50’ maximum
Dimensions:
LL916
Speaker . . . . . . . . . . . . . . . . .9.00” diameter x 5.50” axial length
Cage(HWD)
. . . . . . . . . . . . . . . . . . .10.750” x 10.750” x 7.750”
Net Weight . . . . . . . . . . . . . . . . . . . . 14.0
lbs.
Shipping Weight . . . . . . . . . . . . . . . . 17.0
lbs.
SPECIFICATIONS:
AC203/4A
Frequency Range . . . . . . . . . . . . . . . .
100
Hz
-
20kHz
Impedance (minimum) . . . . . . . . . . . .4 ohms (with
UW
& 8 ohm air speaker connected)
Maximum Input Voltage. . . . . . . . . . 20V
rms
(50 watts
rms
)
Recommended Amplifier. . . . . . . . . . Peavey
MP400M
- 50W/8 ohm 80W/4 ohm (20V
rms)
Peavey
UMA752
- 75W (4 ohm tap
only
@ 17.32V
rms)
Connectors. . . . . . . . . . . . . . . . . . . . .
Input: 0.250” male phone plug on 18” pigtail
U/W Output: 3-pin
Conxall
4182-3SG-300
(LL916-C3
)
U/W Output: 0.250” female phone jack
(
LL98
)
Air Output: 0.250 female phone jack (AIR - 8 ohms min)
Size . . . . . . . . . . . . . . . . . . . . . . . . . . .5.0“L x 4.0“W x 3.0“H
Shipping Weight . . . . . . . . . . . . . . . . . 3.0
lbs.
3

OPERATION & MAINTENANCE
WARNING
!:
Always vacate the pool during inclement weather and lightning storms.
Inspect all speaker and power cables before each use - do not use if damaged. Connect
AC
powered equipment to grounded
GFCI
outlet only. Keep
AC
powered equipment on a
wooden equipment table at least 10’ back from the water in a dry location. Wear dry
rubber soled shoes when setting up and operating equipment. Avoid excessive sound levels
and/or microphone feedback squeal
, which is harmful to hearing and equipment. Read and
understand National Electric Code
(N.E.C.)
Guidelines regarding “Pool Audio Equipment”
(available at library or from city electrical inspector).
1
.
Set up a wooden equipment table 10’ away from the water in the corner deck of the deep end.
Place the Peavey
MP400M
amplifier on the table, and connect the Lubell
AC203/4
Circuit
Master’s attached cord to one of the
SPEAKER
OUTPUTS
on the rear panel. (Do not connect
another speaker to the extra
SPEAKER
OUTPUT
as this will damage system.)
2
.
Place the air speaker
(LL6T,
Impulse 100, or
SX80)
on the deck or
SS7761B
tripod stand, facing
away
from the equipment table to minimize microphone feedback. Aim the air speaker diagonally
(and slightly upward) across the water towards the bleachers to provide sound to the pool surface,
deck, and bleacher zones. Connect the air speaker to the Lubell
AC203/4
Circuit Master’s top
AIR
SPEAKER
jack using a Horizon 16
ga
speaker cord (25’ - 100’). Allow sufficient slack in this
cable, route neatly around speaker stand and base, and cover with a cord protector or rubber mat to
prevent trips and damage.
3
.
Attach a 3/16” rope of sufficient length to the Lubell
LL916C3
underwater speaker cage. Lower
the
UW
speaker to a
6’ depth
in the corner of the deep end; Tether in position or place on bottom.
(Be extremely careful to keep the
UW
speaker connector dry during this step, and not to scrape the
cable on rough surfaces.) Connect the
UW
speaker cable to the Lubell
AC203/4
Circuit Master’s
side
LL916
UW
SPEAKER
jack. Allow sufficient slack in this cable, route neatly across deck and
cover with a cord protector or rubber mat to prevent trips and damage.
4
.
Using a Lubell
SPC1
Resistive Summing Patch Cord (dual
RCA
male to 0.250” male), connect
the
TEAC
AD600
CD/cassette’s left/right
TAPE
OUTPUT
jacks to the
CHANNEL
1
LINE (HIGH
Z)
INPUT
jack on the Peavey
MP400M
amplifier. (If you are using a stereo boom box or
Walkman, set it’s
VOLUME
control to 5, and connect it’s
HEADPHONE
jack to the
CHANNEL 1
LINE (HIGH Z)
INPUT
jack on the Peavey
MP400M
amplifier using a Lubell
SPC2
Resistive
Summing Patch Cord
(3.5mm
stereo mini plug to 0.250” male).
5
.
Connect a high quality plastic bodied microphone (Lubell PRO
2AX)
to the
CHANNEL 2 MIC
(LOW Z)
INPUT
jack on the Peavey
MP400M
amplifier. Turn switch on microphone body to
OFF
position until needed (see step 8 for instructions).
6
.
Connect optional
ATW1451
wireless headset microphone receiver’s “AF OUT” to the
CHANNEL 3 LINE (HIGH Z) INPUT jack on the Peavey
MP400M
amplifier using a Horizon
HC-3 cord.
4

7
.
Now that all equipment is connected,
pre-set
controls as follows: Boom-box
VOLUME
to 5;
Peavey
MP400M
CHANNEL 1
LEVEL
control to 5, and CHANNEL 2 & 3 LEVEL control to 0;
Peavey
MP400M
CONTOUR,
LOW
,
MID
, and
HIGH
controls to 0; Peavey
MP400M
MASTER
LEVEL
control to 0; Peavey
MP400M
REVERB
and
MASTER
REVERB
to 0;
ATW1451
wireless
receiver “AF LEVEL” to maximum (full clockwise);
AC203/4
Circuit Master
AIR
LEVEL
control
to 5.
8
.
To set sound levels in this step, you will need three synchronized swimmers in the following
locations: under the water, on top of the water, and in the bleachers. Connect the Peavey
MP400M
power cord and tape deck power cord into an audio grade surge protected power strip, then to the
GFCI
outlet. Turn the Peavey
POWER
switch to the
ON
postion
(
MASTER
LEVEL
at 0!). Insert a
tape or
CD
into the
TEAC
CD
/cassette (or boom-box), and advance the music to a known section
of music that is very loud. Slowly turn up the Peavey
MP400M’s
MASTER
LEVEL
control until
the submerged swimmer indicates (with thumb up or down) that the
UW
sound level is correct and
undistorted. Now turn the
AC203/4
Circuit Master’s
AIR
LEVEL
control up or down until the
above-water swimmer
and
the bleacher person indicates that the air sound level is correct
(compromise if necessary). The
AIR
LEVEL
control on the
AC203/4
Circuit Master is now
optimized, and
should not be touched again during the practice or competition
. During the
competition, you will need to keep your fingers on the Peavey
MP400M
amplifier’s
CHANNEL 1
LEVEL
knob at all times to keep the sound level consistent from tape to tape. If you have not
trained your ears to recognize a consistent level, you can use a Radio Shack Sound Level Meter
(33-2050 @ $39.99) from your table to observe and maintain a consistent sound level reading in
the room.
When playing tapes of varying level and quality during the meet, listen carefully to what you hear
from the air speaker, and use the Peavey
MP400M
amplifier’s
CHANNEL 1 LEVEL
control and
LOW
/
HIGH
equalizer controls (sparingly) to maintain a consistent sound level and tonal quality.
Always return equalizer controls to 0 position when inserting the next team’s tape. Avoid using
the mid equalizer control or contour controls - leave at 0 position. If you hear distortion in the air
speaker, then the swimmers will also hear this distortion in the underwater speaker -- reduce the
CHANNEL 1
LEVEL
control immediately until the distortion is no longer heard.
9
.
Always use the microphone(s)
behind
the air speaker to minimize squeal. Hold microphone
against lips, speak in a strong voice, and turn the CHANNEL
2 LEVEL
knob (handheld mic) or
CHANNEL 3 LEVEL knob (wireless mic) up on the Peavey
MP400M
amplifier until the desired
sound level is reached. If no sound, then fully reduce
the CHANNEL 2 and/or 3 LEVEL
control on
the Peavey
MP400M
amp, and check the microphone connections and power switch. Once
connections are corrected and/or power is turned on, then turn up the CHANNEL 2 and/or 3
LEVEL knob until microphone sound level adequate.
CAUTION
: DO NOT ALLOW
MICROPHONE SQUEAL -- this is harmful to the swimmers, audience, and the loudspeakers. If
squeal starts, immediately turn microphone off using switch on microphone, then lower
microphone volume control on amplifier.
10
.
After using equipment, tear down in reverse order. Inspect all cables for damage. Towel dry the
UW
speaker, and carefully coil the speaker cable inside the cage recess (just as you would coil a
garden hose). Store all equipment in a dry, air conditioned equipment room far from the damaging
corrosive effects of the
natatorium
.
5

SYSTEM APPLICATION
These remarkable sets are state-of-the-art. 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
Underwater Hockey
Synchronized swimming instruction and competit
i
on
G
unlap
signal, competitive swimming
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 or illegal divers by Coast guard
Making underwater movies
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
hydroelectric facilities, fishing nets, oil/chemical spills,
intercoastal
waterways, and other
potentially dangerous situations.
Dispelling congregated sea lions prior to setting off atomic explosions.
6

OBTAINING SERVICE
No user serviceable parts are contained in the
LL916C3
underwater speaker,
AC20
3/4
Circuit
Master box,
LL
6T
-
Impulse100
-
SX80
air speakers,
Audio-Technica
microphones, Peavey
MP400M
amplifier, or the
TEAC
AD600
CD/cassette (though this devices heads should be
cleaned/demagnitized
by the owner every 10 hours of use).
Should any of these items require service, please repackage securely in it’s original shipping
carton, and contact the manufacturer for a return authorization number
(
RA
)
and shipping
instructions:
Audio-Technica
,
330-686-2600
EV
Audio, 800-685-2606
Lubell Labs, 614-235-6740
Marantz
/Denon
,
630-741-0330
Peavey, 877-732-8391
TEAC
,
323-727-7627
Please include a packing list (itemize contents), copy of sales receipt, 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 a maximum repair amount
was approved in advance.
LIMITED WARRANTY
Lubell Labs warrants the
LL916C3
and the
AC203/4
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. Please refer to
A
u
dio-Technica,
EV
,
Peavey,
Marantz,
and
TEAC
manuals for warranty information, and return items to appropriate
manufacturer for service.
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 on speaker or cage.
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.
7