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 or ETL 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.
Model AC102C (connectors for portable use only). Use with amplifier rated between 150 - 200 watts @ 8 ohms (40 Vrms)
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 LL916C or LL916H underwater speaker per AC102. 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.
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).
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.
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)
Model AC205C (connectors for portable use only). Use with amplifiers up to 78 watts @ 8 ohms (25 Vrms). 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.
