The speaker system shall be an active subwoofer system powered by an internal power amplifier. This amplifier shall have an onboard 24dB Linkwitz Riley crossover at 100 Hz.

The frequency response of the system shall be 40Hz - 100Hz +/- 4dB and shall contain a Low Frequency 18" 460mm 8 ohm driver.

The amplifier power shall be 400 Watts RMS 8 ohms. The amplifier type shall be a Lateral MosFet design. THD shall be <.01% and the Highpass filter shall be -3dB down @ 35Hz.
Loudspeaker protection shall include anti-clipping circuitry, relay muted input, and relay switched output sensing DC and RF error.

There shall be Left and Right Input 3 pin Female XLR connectors, polarity Pin 2 +, Pin 3 -, Pin 1 Ground, and the Input Impedance shall be 44K Balanced (electronic), with a nominal input level of 0dB for nominal rated amplifier output.

There shall also be corresponding 3 pin Male XLR Input Loop Connectors, polarity Pin 2 +, Pin 3 -, Pin 1 Ground for continuation of the input signal(s) to other parts of the system. There shall also be a subwoofer volume control and a 180° Phase Reverse switch on the input panel.

AC Power input shall be preset at either 110V/ 220V/240V,  50/60Hz. The AC Power Input shall be the Neutrik PowerCon type NAC 3 FCA, and the AC Output shall be the Neutrik PowerCon type NAC 3 FCB. AC Power protection shall be provided by a user resettable external circuit breaker. Maximum AC Wattage shall be 600 VA (600 Watts).

The transformer type shall be Toroidal

The integrated self powered speaker system shall be the ARX SPL SUB18