... Manufacturer, professional loudspeaker, professional speaker, pro speaker, professional loudspeaker, pa loudspeaker, professional audio, audio equipment, sound equipment.Loudspeaker, power amplifier ... HF SD800 or I4 for 2pcs LFDriving Mode.........................BI-AMPRecommended Controller.......TASSO DSP360Horn throat size....................1"(25mm)Voice coil size...................... ...