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Reload Thread: 2 or 4 volt preamp on Head Unit

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    2 or 4 volt preamp on Head Unit

    Ok i know this may sound funny and stupid so i'm just gonna go ahead and laugh at my self now sohahahahahahhha oh u so silly

    but i was wondering if it matters if u get a head unit that has 2 volts preamp over a 4 volt head unit and what does it effect exactly

    im looking because my only one yr old sanfrancisco blaupunkt hu is going haywire already like to volume jumping from say 20 to 40 when i try to turn down and say invalid card and putting on mute or going to the next song or another station for no reason bah and hu's with 2 volt preamp r usually cheaper







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    Re: 2 or 4 volt preamp on Head Unit

    4 v better. sound more cleaner. the higher the output the cleaner the sound is.



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    Re: 2 or 4 volt preamp on Head Unit

    Yeah no road noise with a 4v preout plus you don't need to turn the gain up as much on the amp.



    BluntMaster
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    Re: 2 or 4 volt preamp on Head Unit

    lol more cleaner





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    Re: 2 or 4 volt preamp on Head Unit

    Realize that with 2 volts spec, you'll only have about 1/2 volt with the HU at 3/4 volume. While that works fine for most installs, it causes you to crank the amp gain up quite a bit and that can cause some hiss on quiet passages.

    Also realize that the overall quality of 4 v HU's is typically better than the lower models with only 2V. I won't own another 2V HU.



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    Re: 2 or 4 volt preamp on Head Unit

    Quote Originally Posted by Jnoble
    Yeah no road noise with a 4v preout plus you don't need to turn the gain up as much on the amp.
    No road noise? No pre outs are going to affect road noise.



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    Re: 2 or 4 volt preamp on Head Unit

    Quote Originally Posted by JLCivic
    No road noise? No pre outs are going to affect road noise.

    well when i dumped my 2v preout Kenwood and bought a 4v preout alpine I lost 100% roadnoise. Maybe the wires where just loose inside the kenwood. i thought it was because of the higher voltage.



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    Re: 2 or 4 volt preamp on Head Unit

    Quote Originally Posted by Jnoble
    well when i dumped my 2v preout Kenwood and bought a 4v preout alpine I lost 100% roadnoise. Maybe the wires where just loose inside the kenwood. i thought it was because of the higher voltage.
    Roadnoise refers to things like windnoise, tire noise, etc, not alternator whine, engine whine, etc. With higher pre out voltage, you can turn your gains down which could reduce noise coming through your system. Roadnoise isn't what comes through your system though. I assume you mean alternator whine, engine noise, "hissing" etc when you say "roadnoise"



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    Re: 2 or 4 volt preamp on Head Unit

    oh well then i meant engine whine, alternator whine, etc.



    BluntMaster
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    HU: ALPINE CDA-9807
    MTX X01A Crossover
    Door: Orion Cobalt 100.2; Kicker DX-525
    Rear: Orion Cobalt 100.2; Pioneer TS-A6960R
    Rear S: Orion Cobalt 150.2; 2 10" 500W Earthquake Tremors
    Sub Output: MTX Thunder 275X; 1 12" RF Punch HE

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