Lubell Audio Isolation Transformer Boxes

The Lubell Labs 20 volt LL916C or LL916H underwater speakers must be connected to one of the Lubell Labs transformer boxes listed below, which in turn connect to a Lubell Labs approved UL listed amplifier of the correct power and impedance rating. The transformer box and amplifier must be kept in a dry air conditioned area, and AC operated amplifiers must be connected to a GFCI protected AC outlet.

Lubell Labs AC Series transformer boxes provide: 1) Transformer isolation of the underwater speaker from the amplifier for safety; 2) Impedance matching for proper amplifier loading; 3) A tuned RLC circuit that both limits current and flattens the frequency response during broadband operation (music, pink noise, etc.), and; 4) Volume matching of air and underwater zones ("Circuit Master" models). When connected to amplifier of designated wattage and impedance, the output of the transformer box will not exceed 20 Vrms @ 3.0A at full drive, and each underwater speaker will produce maximum sound pressure level of 179 dB/uPa/m @ 1kHz. A variety of transformer boxes are made to provide compatibility with existing or custom sound systems. Splitting transformer boxes (AC203E & AC211) are offered to allow connection / sound balancing of both air and underwater speakers to an mono or stereo amplifier or sound system.


AC102
Model AC102C
(connectors for portable use only). Use with amplifier rated between 150 - 200 watts @ 8 ohms
5.5" x 3.75" x 2.5", 2.25 lbs

Useful for connecting up to four Lubell LL916 underwater speakers to a 150 - 200 watt mono amp (40 Vrms), or up to eight Lubell's to a 150 - 200 watt stereo amp (4 parallel units per channel). Load rating of 32 ohms at 40 Vrms maximum.
Connect AC102 inputs in parallel and in phase only. Connect one U/W speaker per box. Connect amplifier to GFCI only! Also useful for piggybacking an underwater speaker on to one or both channels of a 150 - 200 watt stereo PA system that has one 8 ohm air speaker connected to each channel.

Input of box is fitted with Switchcraft #11 1/4" (6.35 mm) mono phone jack, and output is fitted with Conxall 4182-3SG-300 (pin 3 hot). Supplied with 18" speaker cord with 1/4" male connectors.




AC202B

Model AC202B (special order - screw terminal I/O for contractor install) - use with amplifiers up to 50 watts @ 8 ohms, or 100 watts @ 4 ohms (20 Vrms)
5.5" x 3.75" x 2.5", 2.25 lbs

Special order (consider 78W / 25 Vrms AC205B instead). Used for connecting one underwater speaker to the 8 ohm tap of PA amplifiers not exceeding 50 watts @ 8 ohms or 100 watts @ 4 ohms (20 Vrms).




AC202C
Model AC202C - Use with amplifiers up to 
50 watts @ 8 ohms (20 Vrms), or 100 watts @ 4 ohms (still 20 Vrms)
5.5" x 3.75" x 2.5", 2.25 lbs

Included with the Lubell CAWSS System. Used for connecting one Lubell LL916C or LL916H underwater speaker to the speaker output connector of the Chiayo StageMan amplifier.

Input of box is fitted with Switchcraft #11 1/4" (6.35 mm) mono phone jack, and output is fitted with Conxall 4182-3SG-300 (socket 3 hot). Supplied with 18" speaker cord with 1/4" (6.35 mm) mono male connectors.



AC205B
Model AC205B (Screw terminal for contractor install) - use with 25V constant-voltage (CV) amplifiers below, or Class AB amplifier up to 78 watts @ 8 ohms

5.5" x 3.75" x 2.5", 2.25 lbs


Connects to 25V speaker output of following commercial sound amplifiers (allow 37.5 watts consumption per LL916 / AC205B pair):
1 - 3 Lubell LL916 / 9484 - Bosch PLE-1P120-US power amplifier, or InterM A-120 powered mixer
4 - 6 Lubell LL916 / 9484 - Bosch PLE-1P240-US power-amplifier



AC205C
Model AC205C - use with amplifiers up to 78 watts @ 8 ohms (such as the Phonic 415R included with Lubell LL916 Basic System)
5.5" x 3.75" x 2.5", 2.25 lbs

Also connects to 25V screw-terminal speaker output of following commercial sound amplifiers (allow 37.5 watts consumption @ 25 Vrms for each connected LL916/AC205C):
 
1 - 3 Lubell LL916 - Bosch PLE-1P120-US power amplifier, or InterM A-120 powered mixer
4 - 6 Lubell LL916 - Bosch PLE-1P240-US power-amplifier


Input of box is fitted with Switchcraft #11 1/4" (6.35 mm) mono phone jack, and output is fitted with Conxall 4182-3SG-300 (pin 3 hot). Supplied with 18" speaker cord with 1/4" male connectors.



AC203E


Model AC203E Circuit Master - use with amplifiers up to 78 watts @ 8 ohms
5.75" x 4.625" x 2.5", 2.75 lbs.

Allows connection of one Lubell LL916C or LL916H underwater speaker AND one EV ZX1 or Quadra10 eight ohm air speaker to a mono PA amplifier not exceeding 78 watts rms @ 8 ohms, such as the Phonic 415R or the InterM A-120 offered by Lubell Labs.

Operation: First, set the sound level of the underwater speaker using the master volume control on the amplifier. Then set the sound level of the air speaker using the volume control on the AC203E Circuit Master. Once this perfect balance between air and underwater sound levels is set, then the amplifier master volume control alone is used to control overall air & underwater sound levels as different songs are played.





AC211


Model AC211 Circuit Master - use with amplifiers up to 200 watts @ 8 ohms
5.75" x 4.625" x 2.5", 2.75 lbs.

Allows connection of one Lubell Lubell LL916C or LL916H underwater speaker AND one EV ZX1 or Quadra10 eight ohm air speaker to one or both channels of a portable mono or stereo PA system rated between 150 - 200 watts rms @ 8 ohms per channel (40 Vrms 10.6 ohm min). Operation: First sound level of underwater speaker is set using master volume control on amplifier. Then sound level of air speaker is set using volume control on the AC211 Circuit Master. Once this perfect balance between air and underwater sound levels is set, then the amplifier master volume control alone is used to control overall sound levels.






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Lubell Labs Inc
712 S Yearling Road
Columbus, Ohio 43213 USA
Tel: +(614) 725-2701
Fax: +(614) 725-2702
email: sales@lubell.com