What are the main differences between the IR Series and the ALD?
The ALD (Assistive Listening Device) uses radio frequency (RF) to transmit its signal. The IR Series uses infrared transmission. RF can transmit through walls and IR cannot, Therefore for installations requiring discretion, privacy, or otherwise interference-free transmission (e.g., government, military, school applications), IR is generally more appropriate. The ALD has a somewhat easier set-up and greater range performance and is ideal for churches, theaters and conference rooms where eliminating leakage into other areas is not as critical.
