Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: Digital input?

  1. #1
    Low Bitrate
    Join Date
    Feb 2002
    Posts
    98

    Digital input?

    Of course like every newby I have thinking a lot about how to best get power to my computer. I tend to want to use a inverter so I can take my computer out and use it at home if I need to, but I'm gonna be really ****ed if I have to deal with extra noise or lower sound quality from a ground loop isolator. DC-DC PSUs seem cool but I'm not to happy about modding my sv24 box to fit in a psu, or not being able to use the computer anywhere else..

    Then I saw a post a couple mins ago talking about a amp with digital input and I thought WOW! that would be awesome! a digital input should let me use a inverter and still deliver crystal clear sound right?

    Does anyone here know about any amps or head units that take either coaxal or optical input? I have been looking around and all I can seem to find is 5.1 amps for watching dvds in your car, but thats not really my thing. And of course I searched here too but I couldn't find anything relating to what I am talking about.

    does anyone here use a amp or headunit with digital inputs? much appreciated!
    sv24, 733mhz celeron, 80gig hd, 5.6" MA Audio tft, x10 remote, RF Keyboard.

  2. #2
    Maximum Bitrate
    Join Date
    Dec 1999
    Location
    Buena Park, CA
    Posts
    468
    www.pioneerelectronics.com

    I forget whihc model, but I did see an install in Car Audio & Electronics magaazine where they specifically mentioned the optical input. I believe it is one of the higher end Premier units. Shouldn't be too hard to find.

  3. #3
    Low Bitrate
    Join Date
    Feb 2002
    Posts
    98
    hmm, maybe you saw a product that isn't out yet? I looked through that whole site and I couldn't find anything. Does anyone know what product he saw?
    sv24, 733mhz celeron, 80gig hd, 5.6" MA Audio tft, x10 remote, RF Keyboard.

  4. #4
    Low Bitrate
    Join Date
    Feb 2002
    Posts
    98
    Wait I found it! I had to search through google to find it tho.. I couldn't actually find it on Pioneer's site. It is called the DEX-P9r and it has optical input and output!

    http://www.car.pioneeraus.com.au/cat...t_dex-p9r.html

    the cheepest I found it for is $752 so it doesn't look like I will be buying it anytime soon. Does anyone know of a cheeper way to use a digital connection to remove noise? What about a small converter up by the head unit that converts the optical to rca?

    or what about a usb audio device like this: http://www.edirol.com/products/info/ua3d.html
    Does being outside of the computer solve the noise problem?
    sv24, 733mhz celeron, 80gig hd, 5.6" MA Audio tft, x10 remote, RF Keyboard.

  5. #5
    Maximum Bitrate Skippman's Avatar
    Join Date
    Mar 2002
    Location
    St. Louis, MO
    Posts
    766
    Welcome to my hell. I've been mulling over the same thing for a while now. Here's what I've found out.

    The Pioneer head unit in question uses a propriatary input. I had the sales rep at a local store rip it out of there demo wall to show me. The optical throughput is designed to work with their CD Changer and brain only.

    Alpine makes a stand alone Dolby Digital Processor called the PXA-H510 that has 2 optical inputs. It retails for about $600. I have one of those from my current system (connected to an IVA-C800). It takes standard TOS-LINK inputs. I've hooked the composit video output from my PS2 to the screen and then ran the optical to the processor. Ran just fine. Sounded great.

    There's not cheap solution to this problem, believe me. I've looked. As far as Coaxial SPDIF, I don't believe there is a HU or Processor on the market that will accept that kind of input.

    If you do have Coaxial outputs and want to keep what you have, Audio Authority makes a Coaxial to SPDIF adapter.
    Stereo:Alpine IVA-D900 Head Unit | Alpine PXA-H510 DSP | Boston Pro Component Speakers Upfront | Boston Rally Rear Speakers | 2 Polk 10" Subs in the Trunk | Phoenix Gold Ti900.7 Amp

  6. #6
    Low Bitrate
    Join Date
    Feb 2002
    Posts
    98
    Do external usb sound cards still have the same amount of noise?
    sv24, 733mhz celeron, 80gig hd, 5.6" MA Audio tft, x10 remote, RF Keyboard.

  7. #7
    Maximum Bitrate Skippman's Avatar
    Join Date
    Mar 2002
    Location
    St. Louis, MO
    Posts
    766
    If your talking about somthing like the Audigy, I don't believe do.

    What we're talking about here is alternator wine or 60hz induction. This only occurs on an analog signal. When the amp amplifies the analog sound it also amplifies that line noise. The amp is passive. It will amplify whatever is piped through it.

    External sound cards use digital signals (between the computer and the card itself). After the card, it's a mixed bag. Depends on what type of connection your using to your processor or amp.

    I'm going to be running TOS-LINK S/P-DIF. This is an optical cable that is transmitting digital signals. That will be running to my processor (Alpine PXA-H510). From there the processor will break it down into it's individual analog streams. At that point I have to be concerned about alternator wine myself. But my amp and the processor will be within a foot of each other and I'll be using Phoenix Gold wiring, so there's really nothing for me to worry about.

    What are you planning on? Maybe if you give me an overview I can give a better answer.
    Stereo:Alpine IVA-D900 Head Unit | Alpine PXA-H510 DSP | Boston Pro Component Speakers Upfront | Boston Rally Rear Speakers | 2 Polk 10" Subs in the Trunk | Phoenix Gold Ti900.7 Amp

  8. #8
    Low Bitrate
    Join Date
    Feb 2002
    Posts
    98
    Well thanks for the explanation! I have pretty simple system planned, I just really don't want noise. I have a sv24 that I will putting in the trunk and I will most likely be using a reciever with 2 rca aux input in the back of the unit. My rear speakers are powered by the reciever, and the front speakers and the sub are powered by my alpine amp. I would wire the computer directly to the amp, but I really like having a cd player/radio that I KNOW will always work. I was thinking of using that processor you have, but I noticed it has a din sized unit to control it, and with my current reciever and my in-dash TFT I just don't have any room left.
    So it looks like my options are
    A: Use a inverter and regular sound card and pray to the gods I don't have too much noise
    b: use a DC-DC power supply and not be able to use my computer outside my car (and hack the case putting in the new PSU).
    C: Buy a Processor without a din sized control unit and also buy a card for the computer with optical out. I think since the rear speakers are powered by my head unit I would also have to buy another amp so that all the speakers were connected to the processor.
    d: Somehow find a reciever that has a optical or s/pdif input (not likely)
    e: find something small that could convert the optical signal from my computer to a analog signal without adding any noise. (any ideas?)

    Did I explain everything ok?
    sv24, 733mhz celeron, 80gig hd, 5.6" MA Audio tft, x10 remote, RF Keyboard.

  9. #9
    Maximum Bitrate Skippman's Avatar
    Join Date
    Mar 2002
    Location
    St. Louis, MO
    Posts
    766
    In regards to the following:

    C. That's incorrect. It's alot smaller than it looks. And you don't have to mount it anywhere. Mines sitting loose on my floor.

    E. Not likely. You need a DAC (Digital Audio Converter) to do what you're talking about. And they don't make those outside of head units.
    Stereo:Alpine IVA-D900 Head Unit | Alpine PXA-H510 DSP | Boston Pro Component Speakers Upfront | Boston Rally Rear Speakers | 2 Polk 10" Subs in the Trunk | Phoenix Gold Ti900.7 Amp

  10. #10
    Low Bitrate
    Join Date
    Feb 2002
    Posts
    98
    Actually I did find something called "Dac-in-a-box" that was a external optical to analog converter, but it needed to be plugged in, so I figured the noise would enter in at that point.

    What is the external unit on your processor used for? Do you use the external unit for selecting inputs? can you have two inputs on at once? (so I can listen to music from the head unit and listen to the gps on the computer at the same time). Is that processor really worth it? I won't be playing dvds or anything so I am affraid I will be waisting my money.
    sv24, 733mhz celeron, 80gig hd, 5.6" MA Audio tft, x10 remote, RF Keyboard.

Page 1 of 2 12 LastLast

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
  •