4805 - yet another question

Discussion in 'Displays' started by John*DB, Sep 14, 2004.

  1. John*DB

    John*DB Stunt Coordinator

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    Hi there. I am ordering my cables for my new SP 4805. I want to use DVI.

    Now, I know my projector is not a HD projector. I believe for DVI it transfers at 480p (please correct me if I am wrong).

    Do I want DVI-D, DVI-A, or DVI-I ????

    I will be connecting it to my Denon 1910 which has DVI-D.

    Do I want to NOT use DVI so I can view at 1080i or 720p?

    I have no clue as to what I want. Either lower res with DVI OR higher res with Component.

    Also, I will probably be getting an XBox. I will use component for that.

    How will I switch between DVI (DVD player and movies) to component (XBox).

    Thanks in advance!!!
     
  2. Cameron Yee

    Cameron Yee Executive Producer
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    If you are connecting to the 4805 the jack for DVI is not actually a standard DVI jack but an M-1, which is the connection type used across all of InFocus' current products. If you want to use DVI you need to get an M-1 to DVI cable, available through InFocus for about 40.00 (or through your hopefully authorized seller).

    If you are using the Denon 1910 upconverting to 1080i you will want to use DVI for this. If the 1910 passes 1080i through component, the 4805 will also accept it.

    Switching between DVI and component is simple because the 4805 has separate jacks for each. I suggest connecting the 1910 exclusively to the DVI/MI and the XBox via component (you'll need the HiDef AV pack for this or the Monster Cables equivalent).

    And just so we're clear, the 4805 DOES accept 1080i and 720p. It's just that the native resolution of the projector is EDTV (854 X 480).
     
  3. Stephen Hopkins

    Stephen Hopkins HW Reviewer
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    You can send any signal (480p, 720p, 1080i) from the 1910 to the 4805 gets any signal that's not 480p it will convert it to 480p since that is the projector's native resolution. This leads me to think that you'll get the best picture by sending a 480p signal over DVI from the 1910 to the 4805. While 480p from the 1910 to the 4805 will most likely look the best (or exactly the same as 720p or 1080i from the 1910) it's still worth a try to see which mode looks best to you.

    As for switching between DVD (DVI) and XBox (Component), you'll just select the proper input on the projector usint the remote or the buttons on the projector itself.

    As for the DVI cable it's self you want either Single Link or Dual Link DVI-D. DVI-D is for digital signals, DVI-A is for analog signals (VGA). DVI-I actually combines both DVI-D and DVI-A into one cable. DVI-I would work as well since it's D and A, but you're more likely to find a simple DVI-D cable.

    Hope this helps [​IMG]
     
  4. John*DB

    John*DB Stunt Coordinator

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    Thanks guys. Yes...I bought through an authorized dealer - TV Authority. I live only 60 minutes from their store in Santa Monica, CA, so I'll be going down there in a couple days.



    I am not understanding this part. Could you elaborate a litte and tell me what it looks like or provide a link. Thanks.
     
  5. Cameron Yee

    Cameron Yee Executive Producer
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    If your player is capable of doing custom resolution then 1:1 pixel mapping is the way to go, definitely.

    Check this out.



    But he will still need to get some kind of M1 adapter to connect DVI to the 4805. The projector will not accept a standard DVI connector.

    Here's the one at Amazon:

    http://www.amazon.com/exec/obidos/tg...599308-3312709
     
  6. Cameron Yee

    Cameron Yee Executive Producer
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  7. Cameron Yee

    Cameron Yee Executive Producer
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    That's where I got mine. They can hook you up with the proper cables. Just let them know what you want to do. They are [​IMG]
     
  8. John*DB

    John*DB Stunt Coordinator

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    Help me out Cameron...what am I supposed to see other than 3 pics of Monsters Inc.

    Am I supposed to see a difference? Maybe my laptop screen is not good enough for me to notice the difference of the three pics.

    I have no idea if I can do custom 1:1 pixel mapping.
    Dude...I don't even know what that is. I just want to watch movies on a 7 foot wide screen in surround sound!
     
  9. Cameron Yee

    Cameron Yee Executive Producer
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    1:1 pixel mapping is basically sending a signal matching the resolution of the projector, eliminating any conversion steps. Using a player upconverting to 1080i or 720p the signal gets converted twice - once by the player and again by the projector. Sending it 854 X 480 matches the projector resolution pixel-for-pixel and involves only one conversion.

    If you get a chance look at it on a CRT monitor but I admit the difference is subtle. Look in particular at the purple patch of fur and the gradation around the eyelid. You should see the 854 x 480 is "cleaner." That said it really doesn't matter what you're going to feed it, you will get a great image. Pixel mapping is the way to go if you want to maximize the projector's capability.

    Congratulations on your purchase. You will be very happy.
     
  10. Scott L

    Scott L Producer

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    Just fyi these HD clips I have on my comp look great on the humble 4805. Better than DVD which is the native res of this projector, friends think so too. Still not sure why.

    Just test it yourself when you get and tell us your results.
     
  11. Stephen Hopkins

    Stephen Hopkins HW Reviewer
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    Since the 4805 is 480p x 854 then the 480p output from the DVD player will already be 1:1 mapped to the native resolution of the projector.
     
  12. John*DB

    John*DB Stunt Coordinator

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    sweet! guess I should be good to go then. Thanks everyone.

    John
     
  13. Cameron Yee

    Cameron Yee Executive Producer
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    Actually a DVD player's standard signal is sending out 720 X 480, at an aspect ratio of 1.33 or 4:3. With a custom resolution of 854 X 480 you get an aspect ratio of 1.78 or 16:9. The player (in my case the Bravo D1) does a custom sized upconversion from 720 X 480 to make it 854 X 480.
     
  14. Cameron Yee

    Cameron Yee Executive Producer
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