ReSpeaker 4 Mic Array : 6 channels

while printing the name of device , max input channel and max output channel, this was my output
`'ReSpeaker 4 Mic Array (UAC1.0): USB Audio (hw:2,0)' 6 2`
 I guess it means the device has 6 channels.  As per the codes in the repo the channels should be either 4 or 8 to calculate the distance of source. How do i make changes to find the direction of source for a 6 channel ReSpeaker?