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Thread: Newbie w Tablet Audio + Bluetooth Questions

  1. #1
    Newbie
    Join Date
    Nov 2010
    Posts
    21

    Newbie w Tablet Audio + Bluetooth Questions

    Hello all,

    Been lurking here for quite some time now and originally had a Zotac CarPC which eventually evolved into a tablet solution and now in my new car another tablet integrated solution.

    For starts, the car is a 2013 Altima. I have three amplifiers (1 for the front and rear door speakers, 1 for the rear dash speakers, and 1 for the subwoofer). To get audio to the tablet, it's basically a bunch of RCAs linked together to go into 1 3.5mm input that the tablet has. The tablet is a 2014 Edition Samsung Galaxy Note. The audio quality is okay, but whenever I start to crank up the gains on the amps I start to get a ton of white noise. My assumpion is because I'm downgrading the audio signal due to all of the different RCA connectors? I didn't do the install with the amps...I'm kind of car-tarded when it comes to this side of the project. So, that is my basic understanding of the noise issue. So, with that said, what do I need to purchase in order to get the loudest and cleanest audio. A few people recommended the JBL MS-8, and some people are talking about USB DACs...and I'm not sure if I need one, the other, or both. Any guidance on this would be nice. I did a bit of lurking, but couldn't really find the info I needed.

    As for the bluetooth issue, what is everyone doing for this nowadays? Lots of talk about linking up Parrot kits to bluetooth from the tablet, and then using software like TabletTalk (I think that's what it's called). Is this still the preferred solution?

    Thanks for the help!

    --Dan

  2. #2
    Newbie
    Join Date
    Oct 2014
    Posts
    15
    Putting a bunch of amps on one output should be no problem at all, but this depends on the quality of the equipment. In this case the Note has plenty of strength to drive it since it's designed for headphones, but it may have a noisy output.

    Ideally you should have your output (from the Note) as high as possible, and your amp gains as low as possible. This will provide you with the lowest noise since some noise in cables is unavoidable (but shouldn't really be a problem in most setups). Since you are controlling your volume with the Note, this probably isn't possible unless you use some sort of volume control built into something after the Note.

    Here are some things you can try:
    1. Not sure what kind of amps you are using, but make sure they have a decent signal/noise spec. It should be >90 dB. If not, you need better amps. Car audio amps are usually not that great in this respect. Some are really horrible. With a normal head unit, you can get higher output levels, so the amp gain can be lower and this isn't as important as it is with your setup. In your setup the Note doesn't have very high level outputs, so this is crucial.
    2. You could turn your Note's volume all the way up and use a volume knob in the RCA cables. One like this should work http://www.amazon.com/dp/B003FPD3IS/...I1TQVH9XN9VOIG . If the white noise is coming from the Note (and not the cables), this will help, otherwise it will not. It will not make up for bad amps.
    3. You might try just connecting one amp in the most simple setup (with a different cable) and see if the noise still persists just for trouble shooting. If it works, then something is wrong with your RCA wiring.

    I have a strong suspicion the noise is coming from your amps. If not, it's probably coming from the Note. If it is coming from the Note, a USB DAC will help (if it's decent quality).

    Good luck!

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