I have a Helix Chirp Mega SI G2N on the console of my boat with a Y cable connected XP 9 20 T transducer and XM 9 20 MSI T transducer. I would like to maximize the chirp spectrum settings on my unit but can't find out the usable frequency ranges for these transducers. I realize these aren't true chirp transducers but would like to cover as big a range as possible.
I contacted Humminbird support but couldn't get any information through the representative.
Thanks for any help you can give,