Troubleshooting and Specs of the AR AW791 Headphones

Troubleshooting the Acoustic Research AW791 Headphones
What do I do if I don't hear any sound from the Acoustic Research AW791 Headphones?	Check that the AC Power Supply is fully inserted into the wall outlet and the barrel connector from the AC Power Supply is firmly connected to AC Input Jack. When the AC Power Supply is properly connected and providing power, the Surround Sound ON/OFF Light and Analog Input Indicator Light should be ON prior to making any selections.  Check that the headphones are turned "ON" and the red Power Indicator Light is brightly lit. Check that the Rechargeable Batteries are firmly seated in the Battery Compartment following the polarity markings in the Battery Compartment. Check that the audio source (DVD player, TV, VCR) is turned "ON" and providing sound as it normally should. Check that the headphone Volume Control is turned up. If the Surround Sound LED is blinking, this indicates that the input is DTS encoded. This product does not decode DTS 5.1 encoded digital signals. Refer to your DVD, Satellite, or other manual to change the audio mode from DTS output to Dolby Digital or PCM output. Note: Usually you can select among PCM, Dolby Digital and DTS output formats on DVD players and satellite receivers. Check that the component’s digital sampling rate output is 48K samples/second or lower. This product does not support 96K samples/second. Refer to the component's manual to change the audio sampling rate output.
What if there is distortion or static when listening with the Acoustic Research AW791 Headphones?	Check that the headphone Tuning Indicator Light is illuminated. If not, push the ON/OFF/Tuning Control to manually search for the channel. If it does not lock quickly, change the Channel Select Switch  to one of the other two channels. Confirm the batteries still have enough charge. When batteries become too weak, there can be static breakup. If necessary, recharge the batteries. Change the physical location of the transmitter. Locate it as high and free of obstruction as possible. Avoid placing the transmitter directly on top of a TV. Check that the Digital Coaxial Output from the DVD, satellite, etc., is not connected to the Analog Audio Inputs.
What if there is sound only from one earpiece on the Acoustic Research AW791 Headphones?	Check the left/right balance control on the audio source. Check that the Tuning Indicator Light is illuminated. Check that the batteries have enough charge. Check that both Analog Audio Input Connectors are properly connected, and that the audio source
What does PLL technology do on AW791 Acoustic Research Headphones?	The Acoustic Research headphones incorporate PLL. The headphones are induction recharged using an electric field and incorporate Phase Lock Loop (PLL) technology, which offers three channels for radio transmissions. This helps lock in frequencies for clear reception.

Specifications:

Headphones:
Push-button tuning
40mm titanium-impregnated elements with neodymium magnets
Frequency response