Page 3 of 3 FirstFirst 123
Results 21 to 26 of 26

Thread: Audio issue with Intel Mini

  1. #21
    Newbie
    Join Date
    Jun 2006
    Posts
    37
    Maybe it is down to slight irregularities when in use in 12V DC conditions... But I suppose the Carnetix should smooth out the surges and drop in power common to automotive current...
    Mac-in-a-Zuk

    Suzuki Jimny 1.3 VVT - Mac Mini 1.5GHz Intel Core Solo - 7" Newision NW619VT touch screen - 2x200W amp

  2. #22
    Newbie
    Join Date
    Jun 2006
    Posts
    13
    I really think that, since this issue appears to not happen while on AC power in the house, attached directly (I'm assuming) to amplified speakers, that this may be an impedance issue. While installed in my car, the Mac Mini's audio out goes directly to RCA plugged into my Infinity 4 channel amplifier. I'm guessing that maybe home amplified speaker sets have higher resistance than this amp, seeing as car amplifiers are designed to take the full signal with little impedance and amplify it. The home speakers must have some additional impedance while going into the volume control module (ah! that's it!) that cause the mini to pump the audio output through the line out jack and not the internal speaker. At least, I think this is what's going on.

  3. #23
    Newbie Jagwire's Avatar
    Join Date
    Apr 2006
    Location
    Tacoma, WA
    Posts
    27
    so now that we know the problem (maybe) how do we fix it?

  4. #24
    Newbie
    Join Date
    Jun 2006
    Posts
    13
    the fix that I used with my treo was to add a cheap in-line volume control from radio shack. I think it cost 7 bucks. when I get back into town I can test it to see if there is any difference. basically the volume control knob is a resistor pot...turn it down to about 80% and that puts enough resistance on the line to trick the mac mini jack's sensor into seeing speakers.

  5. #25
    CarFrontEnd Creator iamgnat's Avatar
    Join Date
    Jul 2004
    Location
    NoVA
    Posts
    867
    Quote Originally Posted by snoslicer8
    I really think that, since this issue appears to not happen while on AC power in the house, attached directly (I'm assuming) to amplified speakers, that this may be an impedance issue.
    Thought of that

    I tried it setup the same way in both locations to validate the tests. I tried it both with a set of headphones and with a 1/4 -> RCA cable (not attached to anything either in the house or in the car).

    I used the Sound preference pane to test the results. In the house, Lineout stays stays there (internal speaker is not an option when something is plugged in) with either the headphones or the RCA cable through multiple sleep and boot cycles.

    In the car, Internal Speaker is always the only option and is selected after every boot or sleep cycle with either the headphones or RCA cable.

    Even if your resistor idea works, that is only a patch to the problem (and in the case of your volume controller, it limits the max possible volume) since we know that is not needed in the house environment. I would like to know what the real issue is and address it if possible, but i'm anal like that

    -dave
    My pathetic worklog.
    CarFrontEnd (now it's own sub-forum!!!!)

  6. #26
    Newbie
    Join Date
    Jun 2006
    Posts
    13
    Well, is it possible that, due to some power constraints from the PSU in the car, the Mac Mini is shutting down the external line out part of the sound card to save power? Then maybe when it detects something being actively plugged in, it re-powers on? I'm at a loss...I thought it was purely an impedance issue.

Page 3 of 3 FirstFirst 123

Similar Threads

  1. FAQ: Installing a Mac Mini in Your Car
    By Bugbyte in forum The FAQ Emporium
    Replies: 20
    Last Post: 06-11-2011, 08:12 PM
  2. OEM Navigation Connectors
    By Mr Castulucci in forum General Hardware Discussion
    Replies: 15
    Last Post: 07-20-2010, 05:25 PM
  3. 2 x 2006 Scion xB + Mac Mini (Intel)
    By TnT_xB in forum Show off your project
    Replies: 4
    Last Post: 05-07-2006, 11:17 PM
  4. OSX or windows on intel mac mini for max GPS optimization
    By eacarrender in forum General Hardware Discussion
    Replies: 1
    Last Post: 05-01-2006, 11:12 PM
  5. Replies: 1
    Last Post: 04-27-2006, 08:29 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •