The low frequency speaker system shall consist of two 18" low frequency cone loudspeakers front-mounted in a heavily braced hardwood-plywood bass-reflex direct-radiating enclosure, and a separate Control Electronics Unit.

The Control Electronics Unit shall contain a power supply capable of operating from a 120/240V AC, 50/60 Hz line, a master level control, an active crossover at 95 Hz, a switchable excursion limiter, an RMS limiter for speaker protection, and two active balanced summing inputs.The Control Electronics Unit shall meet the following criteria: total harmonic distortion less than 0.1%; “A” weighted noise level 110 dB below rated output of +26 dBu.

The speaker system, its companion Control Electronics Unit, and a power amplifier rated at 400 watts into 4 ohms shall meet the following criteria: pressure sensitivity, 101 dB SPL measured with 1 watt of pink noise, one meter on axis; frequency response, 30 Hz to 100 Hz plus or minus 4 dB measured with 1ž3 octave pink noise, one meter on axis; output of 130 dB SPL one meter on axis with peaks of 135 dB SPL when driven with weighted noise.

Total harmonic distortion shall be less than 3% at 130 dB SPL one meter on axis at 60 Hz. Speaker enclosure dimensions are 45" H x 30" W x 221ž2" D, weight 176 lbs (79.8 kg).

Control Electronics Unit dimensions are 19" W x 13ž4" H x & 73ž4" D, weight 8 lbs (3.6 kg).

The speaker system shall be the Meyer Sound 650-R2.

The Control Electronics Unit shall be the Meyer Sound B-2EX.