LAB 21 HS is a loudspeaker system suited to high-quality sound reinforcement of infra-low frequencies. It comprises a NdFeB 21” long-excursion woofer magnet (6.5″ voice coil). Loading is a hybrid waveguide indirect radiation system able to completely recover low frequency sound pressure emitted from the rear of its 21” woofer, which means an increase in sensitivity of 6 dB SPL.
In other words, with the same input voltage, this system gives an additional 6 dB over the entire low frequency band compared to the same speaker used in a closed cabinet and, on average, an additional 3 dB compared to what the same speaker would give at low frequencies if used with a horn-loaded, reflex or band-pass system. The fact that the sound is generated by two masses of air moved by a single diaphragm, greatly benefiting attack velocity in the transitory frequencies, results in deep, very clean low frequencies.
Intended as a complete system, the LAB 21 HS ensures very high electro-acoustic transduction efficiency, thanks to its excellent integration of the mechanical and acoustic domains. The coordination of these aspects, along with the dedicated amplifier (Outline T Eleven), enables the maximum energy transfer and output power control fully respecting input signals’ dynamics.
LAB 21 HS has a frequency range at -10 dB of 23 Hz to 165 Hz (maximum crossover frequency suggested: 100 Hz). Among the optionals available, a trolley ensures fast handling and efficient protection of the front of the enclosure against impacts. The black finish is in special high quality wear and weather-resistant paint. Sixteen strategically positioned integral handles facilitate handling.
Wheeled trolley/front panel protection for LAB 21 HS
|FREQUENCY RESPONSE (-10 dB)||23 Hz – 165 Hz|
|IMPEDANCE||4 Ω (min 4.3 Ω)|
|POWER – WAES||2000 (8000 peak)|
|MAX SHORT-TERM SPL @ 1 m*||147 dB SPL (half-space)|
|LOUDSPEAKERS AND LOADING||1 x 21″ NdFeB woofer, hybrid waveguide indirect radiation system|
|WEIGHT – SINGLE UNIT||125 kg (275.5 lb)|
|DIMENSIONS (Net)||Height: 726 mm (28 19/32″)
Width: 1126 mm (44 11/32″)
Depth: 820 mm (32 9/32″)
|* calculated using +10 dB crest-factor signal|