(I have deleted some of my "general chat" posts in this thread to keep it more to the point and shorter - I am now on track with this and things are starting to move forward - watch this space) This is a combination of my posts so far to try and keep blending posts together (from elsewhere).PLEASE voice any opinions you have. .....and so it begins..... Blending options software, firmware & external equipment I have looked into Nvidia Quadro FX cards, others did not get good results from these cards BUT they were using the FX1000 , I have on test the FX4000 AGP card, support for edge blending on the FX1000 has been dropped by Nvidia, the FX4000 is still supported. Nvidia now have pci express 4400 and 4500 versions. 4000 is still the top AGP card Watchout - PC based software - approx cost £4,500 for the software and you need 3 pc's Analogue WAY - £16,750 - hardware based Panaram - hardware based - £25,000 - Hardware based Matrox PJ range of cards - offer 3 & 4 head display with OVERLAY only. $2000 or $3000 - PCI card based - NOT ON GENERAL SALE but current models DScalar - currently being looked at Baro SEMU - I have 2 boards not sure if SEMU or SEMU lite - can only tell when in projector will update as I find out Barco polaris - software for use with projection within domes etc Powerstrip - still to investigate this Items I have so far Nvidia Quadro FX4000 card Grapics card in HTPC 2 BG1208s/E with convergance on green boards (These wont fit the 801s ). Six new P16 tubes. Contrast modulation board WITH soft edge optional board I will try and post pics as this moves forward My reasons for trying this are as follows Use of more vertical tube size so higher resolution and brightness- My Main Reason (see below*) Slight increase in brightness PJ nearer screen - not a main reason Better convergance stability PJ nearer screen - not a main reason * I have a fixed 16:9 screen, widescreen from one PJ uses 75% of vertical tube height - hence the masks you see on loads of tubes As I calculate 2 PJ with a 25% overlay should use 98.4375% of the vertical tube height - and greatly increase the resolution to a total picture of 2100x1600 and give a 25% increase in brightness per projector, which will mean a % increase in brightness overall not sure how that bit works ! I know there are people out there who dont think this will use any more tube area - I could be wrong - but to date no one has convinced me of that. The combined tube area becomes almost (within 2% inc. overlay) a native 16:9 ( Boy I is gonna feel silly if I got that wrong ) Maybe I will fail but along the way I will have tried something new, had a bit of fun, and will accept the "told you so's" of course if I succeed "A large shout of were not worthy" will be heard from the non believers. Currently the odds are 15% in the blenders favour and 85% against (Changed odds following my 12 projector line up for 360 deg projection) Other threads http://www.avforums.com/forums/showthread.php?t=232978 - info about rgb bgr tube reverse in stacked systems My own notes in case anyone wants to follow my progress Original idea started from conversation with Roland, this is a test system to see if it is worth the investment of 2 x Barco 120* series projectors (which I have now bought as the project is taking a long time and the oportunity came by) Nvidia Quadro FX4000 - Installed in my HTPC running v7.x.x.x latest drivers Picture quality noticed as better than prvious card (ATI 9600 AGP I think) NOTE: Change of graphic card or any signal replated parts and convergance check - noticed very minor convergance differance between cards - this initally made picture look a bit out of focus or grainy, now rectified. Colours are however much more vibrant tested new quadro fx4000 card - my view is that it gives better detail definition and the tonal colour output is better than my original card.