This is for RNvinc or anybody who can tell me the answer I have a perfectly good 798SI head unit with a badly cracked SI transducer given to me from a guy I installed a new HElix 7 Gen2 SI on his boat. I have an extra quadrabeam transducer and a dual beam 83/200 with a dual cord laying around I will never use again. Another friend of mine, who can't afford a new HELIX unit on his boat to replace a 80s Matrix POS, has a need for this 798SI unit as I being nice guy, is going to hook him up with the 798SI at no charge. IS it possible to use dual beam transducer cord and hook up a "quadrabeam" transducer AND a dual beam transducer 83/200 to this 798SI? Yes I upgraded the software and this 798SI only has 300 hours on it. I know it can be done with a regular SI transducer and a 83/200 dual beam but I don't know if it can be done with the older Quadrabeam transducer. Somebody will know here.