Greetings.. CANT beleive what I'm reading.. "RUNCO" told you that your unit "doesnt have a high FreQ" you MUST have "missunderstood them.. because your SCAN rate is extremelt HIGH and INDEED can double the scan lines you are refering too. Your unit..Cinema Pro 750.. is better made back then.. some of the top units today. I' personelly know SAM RUNCO.. worked with him for many a year. I' have a 750 pro running as we speak with a LD100 Line Doubler.. the picture is FLAWLESS''' NO scan rate or lines.. as a matter of fact..after reading your posting. ""I'contacted' my old buddies at RUNCO to see who would told you such a thing.. no one theres remembers the call.. maybe you mistaken what they referted too. Your unit has onbly (2) feeds so it must be converted with a super or line spliter for (3) signal.. just as I' have done.. RADIO SHACK has the cable or can be ordered on-line. The ""Faroudja LD100 is ther ONLY unit that will work with yours.. it is an older model.. approx 7-years old.. $14,000 US when NEW.. now they go for around ....on E-bay $ 1,500. thats a pretty good deal considering they will LAST FOREVER.. the units were the FLAGSHIP scaler/converter/linedoubler of its time and STILL a fine unit that would cost you around $10.000 US to buy its contender. Any ways CHECK OUT E-bay.. BUT BE SHURE TO ASK THE SELLER if it has a SUPER in-feed.. if you are not sure.. let me know and I' will check out E-bay for you. your unit with a LD100 is better then the best LCD projector and as good as SONY's top unitys today. it is built to last with features and Tech.. you can only boggle your mind with..