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    Thread: Interest Check : DIY Audiophile-Grade 2DIN Car Audio - Video InVehicleInfotainment (IVI) Head Unit

    1. #1
      aka cmsajith
       
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      Interest Check : DIY Audiophile-Grade 2DIN Car Audio - Video InVehicleInfotainment (IVI) Head Unit

      This is a continuation of another thread http://gearheads.in/showthread.php?1...-(Audio-Video) for building an audiophile grade 2DIN InVehicleInfotainment (IVI) headunit.

      I have the prototype ready (based on Dual Core or Quad core CPU / Quad Core Mali-400 GPU / 1GB RAM running Android 4.1 JellyBean OS) with the following features:


      - 6.2" / 6.5" / 7" High Quality IPS LCD panel with 1080p full HD resolution support (panel resolution 1280x800 (16:10) / 800x480 (16:9))

      - Audiophile grade internal DAC / external USB DACs.

      - Hard Disk support: 1GB - 5TB and *any USB storage device

      - Audio format supported : FLAC, FLAC(HD), WAV, MP3, APE, AAC, OGG, AC3

      - Video Format supported : WMV, ASF, MP4, 3GP, AVI, 3G2M4V, MJPEG, RV10, VC-1, DivX, MPEG-2, MPEG-4, H.263, H.264,1280x720P HD 30fps,1080P/720X480 D1 30fps

      - Audiophile grade PreAmp section with 2v o/p (need to finalize)

      - OBD reader with Torque as default reader app

      - High quality GPS receiver that can be used with Google Maps / Sygic / similar app

      - Reverse / Front parking camera support

      - HeadUnit navigation using external remote

      - All upgrades will be Modular so that the previous owners can upgrade their existing HU by paying the extra charge.

      - Optional basic Internal Amplifier.

      Under development \ Future Plans:
      - Customized GUI (need to finalize)
      - TPMS unit
      - BluRay support
      - 1DIN Unit that can support big screens
      - Multi-Zone support (Driver / Individual Passenger) but with audio line out for the main Zone and HeadPhone support for the individual zones.
      - Touchscreen support
      - Front / Rear view recording
      - Audiophile grade internal \ external stereo amplifier
      - DSP
      - FM Reception
      - Steering wheel button control

      I am ready to take it up as a project (product under GearHeads brand) so that it will be beneficial for the forum members as a VFM product compared to the available commercial products. Based on the interest, this can be developed as a complete product.

      ------------Edit--------------
      Following is the list of members who are interested in this HU + their requirements:
      Car Audio:
      fernando
      matbhuvi
      Lvramanan
      venki7744 (separate display / miracast support)
      Pradeep
      bamaboy (FM reception)
      Pr_007
      SunnyBoi (2DIN unit)
      kdp

      Home Audio:
      Nil
      Last edited by CMS; 21st Jan 2014 at 23:54.

    2. #2

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      interested..
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      Great initiative there CMS ! Appreciate your time & efforts on the project. I'm interested as well. If you need assistance on the GUI part, I can contribute as well. Let me know if you need help.

      One query though.

      Quote Originally Posted by CMS View Post
      PreAmp section (need to finalize) with 2v o/p
      Apologies for the noob question. This might be too early or not a right time to ask. Won't 2V be too less for a quality signal to be fed to the amp (if required to be) ?

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    5. #5
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      Quote Originally Posted by Lvramanan View Post
      Won't 2V be too less for a quality signal to be fed to the amp
      I dont think so, a good quality ~2v is sufficient for a power amp to work fine unless its o/p gain is very less. Based on my home audio experience, nobody prefers more than 2v. In car audio, if I find the requirement of >2v, i think it can be done.
      Last edited by CMS; 29th Apr 2013 at 14:57.

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      Quote Originally Posted by CMS View Post
      I dont think so, a good quality ~2v is sufficient for a power amp to work fine unless its o/p gain is very less. Based on my home audio experience, nobody prefers more than 2v.
      In car audio people prefer as much volts as possible

      The HRT Streamer is supposed to put out 2.25 v, but when i put a AudioControl PreAmp (upto 13v - i was driving at ~5v) inbetween, the difference was very noticeable.

      The Amps (Zapco and couple of Celestra's needed much lesser gains) - End Result Same Power with much cleaner signals !

      There is such so much stuff in car audio which will want to spoil the signal quality (or induce noise in the chain) - only a few of them are in our control
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      Thanks CMS thanks for initiating this. I am very much intrested.

      Venki

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      Is it possible to support Active as well?
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      Quote Originally Posted by Lvramanan View Post
      Won't 2V be too less for a quality signal to be fed to the amp (if required to be) ?
      Quote Originally Posted by CMS View Post
      a good quality ~2v is sufficient for a power amp to work fine unless its o/p gain is very less.
      I too would go with CMS's point that 2V or even 1V O/P is sufficient (from a HT p.o.v).
      Not that it's difficult to add into the design, but are 5V pre-outs really necessary?
      Most of the amplifiers I've checked can work from a few mV onward. Unless you have extremely long cables runs, I'm hazarding a guess that with large pre-outs you'll probably end up just attenuating it at the amp input or over-driving the amp quite early (as seen in many setups)

      Edit:

      Quote Originally Posted by Mi10 View Post
      In car audio people prefer as much volts as possible
      Any idea on what is the real reason (than marketing) in pushing for higher pre-outs? I've read about seemingly better headroom on some forums but I find most of that crap non-scientific.

      Better Noise immunity? Won't diss it completely, but I find that a bit over-rated as well.
      Last edited by Digital Vampire; 29th Apr 2013 at 15:14.
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      Quote Originally Posted by matbhuvi View Post
      Is it possible to support Active as well?

      Now that would be the thing to achieve; It would require complete crossover module and control units for each preout. Thats might as well pave way for the first Android based 24 / 32 bit DSP !!

      Quote Originally Posted by Digital Vampire View Post
      I too would go with CMS's point that 2V or even 1V O/P is sufficient (from a HT p.o.v).
      Not that it's difficult to add into the design, but are 5V pre-outs really necessary?
      Most of the amplifiers I've checked can work from a few mV onward. Unless you have extremely long cables runs, I'm hazarding a guess that with large pre-outs you'll probably end up just attenuating it at the amp input or over-driving the amp quite early (as seen in many setups)
      DV, if you take the car audio market, now a days even entry level Head Units come with 2 V Preout. A Mid end HU (~ 8-9k) Come with 4 V Preout and All other Audiophile HU's have extremely strong pre Amp Section putting out anywhere between 5-8 Volts.
      But we all know that voltage is not a constant, the volts given may be the max limit coming out of the preamp - Everyday running would still be around 2-3 Volt i guess.
      Also Most Cars need 5 meter RCA's (unless they have a processor or a PreAmp at boot) . And it does have a difference between 1V Preout HUs to 2 V to 4V to 8V !
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