The LL-1424HP is a piezoelectric underwater acoustic transducer designed for general purpose military and scientific applications. The LL-1424HP may also be used as an underwater speaker when high power is required.

The LL-1424HP has a useful frequency range of 200Hz-9kHz, a maximum SPL of 197dB/uPa/m @ 600Hz w/80V rms applied, and a nominal impedance of 8 ohms. Because of variation between cast parts, the uniformity of response cannot be guaranteed but is typically +/- 1.5dB from published values. The LL1424HP is provided with an AC1424HP bridging transformer box allowing connection to amplifiers up to 2500 watts at 4 ohms bridged mono.

The LL-1424HP is built to withstand ocean environments by virtue of its 10 mil epoxy finish and cage mounting system. The LL-1424HP is fitted with a Seacon bulkhead connector and includes a mating 75 foot Seacon cable.

• Frequency Range: 200Hz - 9kHz
• SPL: 197dB re 1uPa@1m at 600Hz
• Operation Depth: 2m - 12m

The Lubell Labs VC2C is an underwater acoustic transducer covering the frequency range of 50 Hz to 1500 Hz at a maximum sound pressure level of 174dB/uPa/m @ 115 Hz. The VC2C must be accurately pressurized while topside, in order to balance the internal pressure with the external pressure for the intended fixed operating depth. We recommend connecting the VC2C to the 4 ohm and common terminals of the InterM A-120 amplifier (North America sales only), which must be purchased separately. Since the VC2C has a maximum current rating of 2.5A, we recommend installing an inline fuse holder with 2.5A fast-blow fuse in series with the white signal lead to help protect the VC2C against burn-out. Sales of the VC2C is limited to marine scientists and laboratories, ocean engineers, and the military.

Speaker, cable, and amp RoHS & CE marked for export to EU.

• Description: Axial symmetric dual-piston radiator with spring copper diaphragms and external stops
• Materials: End plate assm - 316 stainless steel; Pistons/housing - Hardcoat anodized 6061 aluminum
• Finish: Safety yellow TGIC polyester powder coat
• Frequency Range: 50 Hz to 1.5 kHz
• Resonant Frequency: 115 Hz +/- 5 Hz
• Impedance: Varies with frequency (4 ohms min @ 50 Hz; 17 ohms @ 1500 Hz)
• Maximum Output Level: 174dB/uPa/m
• Maximum Voltage/Current: 20 Vrms/2.5A (100% duty cycle)
• Q Parameters: Qtco~2.5 Qmc~5
• Directivity: Omnidirectional to 1.5 kHz
• Bulkhead Connector: Subconn MCBH3MSS (Coding: Pin 2 hot, Pin 1 return, Pin 3 ground)
• Mating Cable: Subconn MCIL3F // MCDLS-F on 50 feet (15.24m) 18/3 SOOW cable
• Minimum / Maximum Depth: 10 feet (3.05 meters) - 50 feet (15.24 meters)
• Maximum Pressure: 23 psi (WARNING: use provided hand air pump only!)
• Piston Stop Gap: 0.016 inches (Schrader valve pin depressed topside before deployment to equalize internal/external air pressure)
• Dimensions (LWH): 9.5 IN (241.3mm) x 8.5 IN (215.9mm) x 8.5 IN (215.9mm)
• Weight: 23.25 lbs (10.55 kg)

The LL964 is a heavy-duty 64 ohm piezoelectric underwater speaker identical to the LL916 except for higher impedance. Because of higher impedance, cable lengths up to 4 km using standard SO cable are possible with minimal losses.

• Frequency Range: 200Hz - 20kHz
• SPL: 180dB re 1uPa@1m at 1kHz
• Operation Depth: 1.83m - 15.24m
• Speaker Impedance: 64 ohms nominal
• Maximum Voltage: 40 Vrms
• Maximum Current: 1.5A
• Maximum spliced cable length: 4.19 km of 3 conductor (3,191mm2) cable