Lubell Audio Isolation Transformer Boxes

Lubell Labs LL916 series underwater speakers operate at 20 Vrms, and are designed for use with (and sold with) the Lubell Labs Audio Isolation & Matching Transformer Boxes listed below, which in turn connect to an UL approved 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); 4) Volume matching of air and underwater zones (AC203E & AC211 "Circuit Master" models). When connected to amplifier of designated wattage and impedance, the underwater speaker 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 inch x 3.75 inch x 2.5 inch, 2.25 pounds

Useful for connecting up to four Lubell LL916C or LL916H portable underwater speakers to a 150 - 200 watt mono amp (40 Vrms), or up to eight
LL916C or LL916H portable underwater speakers 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 1/4 inch (6.35 mm) mono phone jack, and output is fitted with Conxall 4182-3SG-300 (pin 3 hot). Supplied with 2 foot speaker cord with 1/4 IN TS connectors.




AC202B gray box

Model AC202B (
Screw terminal I/O for permanent installation by contractor) - use with amplifiers up to 50 watts @ 8 ohms, or 100 watts @ 4 ohms (20 Vrms)
6.1 inch x 3.75 inch x 2.5 inch, 2.25 pounds

Used for connecting one in-wall LL916 U/W speaker (part of 9484 kit) to the 8 ohm tap of PA amplifiers not exceeding 50 watts @ 8 ohms or 100 watts @ 4 ohms (20 Vrms).




AC202C
Model AC202C
(connectors for portable use only). Use with amplifiers up to 50 watts @ 8 ohms (20 Vrms), or 100 watts @ 4 ohms (still 20 Vrms)
5.5 inch x 3.75 inch x 2.5 inch, 2.25 pounds

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

Input of box is fitted with Switchcraft 1/4 inch (6.35 mm) mono phone jack, and output is fitted with Conxall 4182-3SG-300 (socket 3 hot). Supplied with 2 foot speaker cord with 1/4 IN TS connectors.



AC205B
Model AC205B (Screw terminal I/O for permanent installation by contractor). Use with 25V constant-voltage (CV) amplifiers below or Russound A2100

6.1 inch x 3.75 inch x 2.375 inch, 2.25 lbs

Connects to 25V speaker output of following commercial sound amplifiers (allow 37.5 watts consumption per LL916 / AC205B connected):

One to three Lubell LL916 (part of 9484 kit) - Bosch PLE-1P120-US power amplifier, or InterM A-120 powered mixer (USA sales only)
Four to six Lubell LL916 (part of 9484 kit) - Bosch PLE-1P240-US power-amplifier (only USA model has 25V tap - order from Lubell Labs for export)



AC205C
Model AC205C
(connectors for portable use only). Use with amplifiers up to 78 watts @ 8 ohms
5.5 inch x 3.75 inch x 2.5 inch, 2.25 pounds

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):
One to three 
LL916C or LL916H - Bosch PLE-1P120-US power amplifier, or InterM A-120 powered mixer
Four to six Lubell
LL916C or LL916H - Bosch PLE-1P240-US power-amplifier


Input of box is fitted with Switchcraft 1/4 inch (6.35 mm) mono phone jack, and output is fitted with Conxall 4182-3SG-300 (pin 3 hot). Supplied with 2 foot speaker cord with 1/4 IN TS connectors.



AC203E


Model AC203E Circuit Master
(connectors for portable use only). Use with amplifiers up to 78 watts @ 8 ohms (25 Vrms)
5.75 inch x 4.625 inch x 2.5 inch, 2.75 pounds

Allows connection of one Lubell LL916C or LL916H underwater speaker AND one EV ZX1-90 or Quadra10 eight ohm air speaker to a mono PA amplifier not exceeding 78 watts rms @ 8 ohms (or the 25V tap of 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
(connectors for portable use only). Use with amplifiers up to 200 watts @ 8 ohms (40 Vrms)
5.75 inch x 4.625 inch x 2.5 inch, 2.75 pounds

Allows connection of one Lubell Lubell LL916C or LL916H underwater speaker AND one EV ZX1-90 or Quadra10 eight ohm air speaker to a mono or stereo PA system rated between 150 - 200 watts rms @ 8 ohms per channel (40 Vrms 10.6 ohm min). 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.




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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