What does the "ATT" and "AVR" mean on the transmitter in HT5009 set?
The "ATT" means "attenuation", it is to describe the volume attenuation function of the of the transmitter.
There are two options here: the "AVR" and "TV".
AVR - Please switch to this side when you have an AV receiver in your setup, the volume on this side is lower, this function is to protect the transmitter from being damaged because of the high volume from the AV receiver.
TV - Please switch to this side when you do not have an AV receiver in your setup to enjoy a higher volume.
Please feel free to contact us at support@avantree.com for any other questions.