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Thread: Audio Question: Equalizer/Line Driver/Loc??

  1. #1
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    Audio Question: Equalizer/Line Driver/Loc??

    Hi Guys,

    my project is almost finished.
    The carpc in working. will put the project in the project section.
    My concern right now is :

    I'm using the onbaord sound card (RealTek) with an Intel Motherboard (Intel D945GCLF2).
    I'm using to 3.5 jack (line out and line in) out of the sound card and into 4 inputs of my OEM Audi Amp.
    the Audi amp outputs sound to 9 speakers.

    the sound resulting from this is ok, but not two strong and some MP3 or even Flac files sound distorted when volume is pushed higher and bass sounds muffled.

    Solutions (let me know your opinions here)

    Line driver
    Line output converter (this is only for speaker level inputs I suppose)
    Equaliser with integrated line driver

    Note:
    I don't want to change the OEM amp and the cabling.
    I don't want to put an equalizer in the dash.

    Question: if I go for a line driver only is the mixer or equalizer of Centrafuse (or any software equaliser) enough to tweek the sound coming out of the sound card.

    Please you ffedback and comments.

    here is a video of the carpc (the car is an 2009 Audi TT MK2)

    http://www.youtube.com/v/4GBfYxLbRsQ

  2. #2
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    get an auzentech card.

  3. #3
    MySQL Error soundman98's Avatar
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    your right about the line output converter-- that would convert speaker level(high voltage) to line level(low voltage) signals-- so it doesn't really apply here.

    for the low level, a preamp would be your best option-- it is kind of up to you wheather you want a eq/line driver, or just a plain line driver.

    try to use the centrafuse eq a little to determine if it has enough adjustablity for you-- even at a low level, you should be able to decide if it is enough for what you want to do.

    this is where i would insert my review of the jl audio cl-rlc as a preamp, and a volume control. it works great for me, but is a little pricey @ $50 ea. but don't worry, there are alternatives that are cheaper-- just look around for them.

  4. #4
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    Quote Originally Posted by soundman98 View Post
    your right about the line output converter-- that would convert speaker level(high voltage) to line level(low voltage) signals-- so it doesn't really apply here.

    for the low level, a preamp would be your best option-- it is kind of up to you wheather you want a eq/line driver, or just a plain line driver.

    try to use the centrafuse eq a little to determine if it has enough adjustablity for you-- even at a low level, you should be able to decide if it is enough for what you want to do.

    this is where i would insert my review of the jl audio cl-rlc as a preamp, and a volume control. it works great for me, but is a little pricey @ $50 ea. but don't worry, there are alternatives that are cheaper-- just look around for them.

    That's some real feedback :-) thanks SoundMan.
    can you please just elaborate on how you're using the jl audio cl-rlc.
    my carputer ar, car battery and oem amp are in the trunk, does this device ned to be in the front of the car; i don't want to audio cables cables to the front of the car.
    How do you connect this device to have four channels output ?
    The price is ok if this device will do the job right.

    Waiting your explanations befor I make the order...

  5. #5
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    Ok, I just read your review. great post.

    still I need to know how many devices will I need?

    I need 4 channel output. I have an OEM 9 speaker system setup with an OEm amp which has 4 inputs. FL-FR+RL-RR.
    My soundcard has a quadrophonic settings which enables the use of the four channels.
    I don't really need the knob. i'd rather use Centrafuse to control the volume.

  6. #6
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    I found this 4 channels line driver at 64$

    HIFONICS HFEQ 4 BAND CAR EQUALIZER



    Half-DIN, 4-Band preamp EQ with front/rear active crossover features
    Line Driver circuit delivers 9-volts of preamp level signal through the RCA's
    Audio input selector for switching between headunit and another audio source
    Input level controls for both the car radio and any media device to insure identical volume levels
    Master volume control of the SPL-Level for both sound sources
    Front to rear dual-amp fader
    2-Audio inputs with level matching
    Selectable 12dB high-pass crossover and low-pass sub output
    Selectable for mono or stereo subwoofer setups
    45Hz sub-bass control
    120Hz mid-bass control

  7. #7
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    another question: the OEM AMP does not have RCA inputs. It has proriotory connector. I tapped into the input cables coming from the head unit to connect the ouitput cables coming from the sound card. Does this have any negative effect on the sound card output level? will this have any negative effect if I use a line driver?

  8. #8
    MySQL Error soundman98's Avatar
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    the cl-rlc wouldn't really support fading, and the knob would need to be plugged in for it to work(the knob tells the preamp how loud to make it, so without it, the preamp defaults to the quietest setting). you could use 1 or 2 depending on the amount of control you want:
    if you use 1 you can just use rca y-adapters off that to get 4 channels, but would not have any fade control.
    if you use 2, you can have independent fade control, but have the extra cost, and 2 units to mess with.

    that hifonics unit looks good for what you want to do.

    i tried looking up your amp, but some of the areas on the audi forums needed me to create a username(not until i consider getting a audi)...

    the amp might be looking for a speaker level signal(high voltage), so you would need to use a amp before it to work.

    but, if the amp is looking for a line level signal(low voltage) then the preamps should work fine.

    you'll have to do some of your own research on the audi forums for that(primarily to learn if it takes high level, or low level inputs).

  9. #9
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    Edit: NM, I see you have removed your head unit.
    I have too much time and too little aggravation in my life, so I built a carPC. ;)

  10. #10
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    Quote Originally Posted by hithere View Post
    Edit: NM, I see you have removed your head unit.
    ask away-- i ran a hu setup for about 4-5 years before ditching it for the carputer, so i would say that i am fairly well practiced in generic audio connections (can't help you much on the audio specific stuff without help though).

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