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DIY'ing on Oem HU (strictly for/with proffessionals in electronics)

Discussion in 'Do It Yourself' started by jayadev, Aug 11, 2011.

  1. Italia-Linea

    Italia-Linea Staff Member Janitor

    Messages:
    2,123
    Pune
    so summing it up which pin is Front right positive negative and which is front left positive negative?
  2. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    What is this positive and negative? i dint get you.
  3. Italia-Linea

    Italia-Linea Staff Member Janitor

    Messages:
    2,123
    Pune
    all the speakers as well as output on amplifiers have a positive and negative connection. speakers have a polarity. in this context i was asking about the connections.
  4. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    All the details are in manufacturer datasheet.
  5. Italia-Linea

    Italia-Linea Staff Member Janitor

    Messages:
    2,123
    Pune
    unfortunately, the datasheet does not mention positive negative references, which is very important. the subwoofer if connected with reverse polarity gives totally diff bass and so do the speaker.
  6. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    I hope you are talking about the stock HU power amp.
    All you need to do is reverse the connections. technically there are no positive or negative for speakers or amplifier outputs but phase.everything should be in phase.it doesn't matter how you connect.
    Check the diagram you will get it.

    circ.jpg
  7. bhai

    bhai Esperto

    Messages:
    1,183
    Ahmednagar
    Grande Punto 1.3 90 HP
    how do I know wheather polarity of my speakers is correct ?

    I mean what are the signs of incorrect polarity ?
  8. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    Either you check the cabling and polarity signs visually or an ICE Expert is required.
  9. Italia-Linea

    Italia-Linea Staff Member Janitor

    Messages:
    2,123
    Pune
    Hi Jayadev, i was investigating a bit about the pin outs on the rear of the HU.

    What do u think the AF R, AF ground and AF L connections are?

    i am suspecting that a preout can be taken out from there if internally the board is connected to these pins.

    any suggestions?

    pin layout.jpg
  10. jayadev

    jayadev Esperto

    Messages:
    1,057
    Kannur, India
    Kannur
    Grande Punto 1.3 90 HP
    I don't remember exactly what they are .But i doubt when i tried through them they did not sound well or there was some issues so i opted for my way.If you can just give it a try it would be nice.

    But looking at IR +5V,AND IR IN . I think they are port for infra red sensor for remote control.

    FYO,that open "switch sign" between IR in and aux, is for auto on pulse to amplifier

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