Closed Thread
Results 1 to 10 of 10

Reload Thread: pre-out voltage

  1. #1
    nas786's Avatar
    nas786 is offline Senior VIP Member



    Join Date
    Sep 2004
    Location
    central cali
    Posts
    216
    Post Thanks / Like
    Mentioned
    0 Post(s)

    pre-out voltage

    how big a factor does the preamp output voltage play, when running aftermarket amps to the head unit??

    also, does it get dangerous at any point?? for example, eclipse has a hu with 8v output, that's pretty **** high, do i have a higher chance of blowing my speakers with them, or something?







  2. #2
    VisionxOrb's Avatar
    VisionxOrb is offline Member



    Join Date
    Jul 2004
    Location
    Thousand Oaks, Ca
    Posts
    84
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    The Idea behind High voltage prepouts its to run alot of "signal" and to run the gain "sensitivity" low on your amp improving the signal to noise ratio and making it harder for things like alt. noise to appear. Now some amps say they cant take that much voltage but im running a audiocontrol 3.1 which is a 12v peak line driver and ive never had one problem on any amp.

    Quote Originally Posted by nas786
    how big a factor does the preamp output voltage play, when running aftermarket amps to the head unit??

    also, does it get dangerous at any point?? for example, eclipse has a hu with 8v output, that's pretty **** high, do i have a higher chance of blowing my speakers with them, or something?



    Vehicle: 2004 GMC Seirra 2500HD Crew 4x4
    Fronts: CDT CL-62 with M519s UpStage kit
    Rears: Hybred PG/Focal comps
    Comp Amp: RF 800.4
    HU: Super awsomemo GM 6disk Indash w/ PAC Interface w/ AudioControl Three.1

    Subs: 4 re8's
    Sub Amp: SoundStream Van Gogh 1600.2

  3. #3
    3.5Max6spd's Avatar
    3.5Max6spd is offline yo mama no wear no draws



    Join Date
    Jun 2004
    Location
    Dirty Jersey
    Age
    36
    Posts
    3,767
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    typically, the higher the voltage signal to the amp, the lower the gains on the amplifier- leading to less distortion overall



    rainbow....homemade sounds best
    DYNAUDIO E S O T E C....Mobile Fidelity

    Panasonic Vacuum Tube
    TRU Technology SSLD6
    TRU Technology STEEL S44 & S500
    DYNAUDIO Esotec System 362
    Dynaudio MW190 12" (x2) IB
    Stinger Expert/Esoteric Audio Isopath/Cascade


    Refs-NE14MX , jdavis37, anarchy57, mj121983 , ll kadoy ll, TheBigDu , cdj ,Kawasaki STX-R ,Fdeez ,Ksin291,meangta, lil azn 06, HAVINGFUN, Loud1500, Flipx99 , jjunior887 ,mastarecoil ,slammed , T3mpest ,westerbud, Airman21, bconn587, LexNBimmer,namike, alphakenny1, HebrewHammer,chadillac,remiserg, purerx7tt, OCURIEL, coneO,Igno,Iluvzmzm,godzukiduce,CrazedCat,skylar11 2,
    bose301s,qwertvt

  4. #4
    mrray13's Avatar
    mrray13 is offline uz some fegbags



    Join Date
    Dec 2001
    Location
    IL
    Posts
    3,633
    Post Thanks / Like
    Images
    16
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    in laymens terms.....it's a good thing! it helps keep u from trying to crank the gains..

    basicly, it sends a stronger signal to the amp, so the amp doesn't have "to work as hard" to reproduce it.....so u get to keep the gains down without sacrificing volume..







    wow three answers..lol....that all basicly say the same thing...hehe






    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee



    Quote Originally Posted by lilmaniac2
    Your circles look like something a HMO doctor would do to a **** job ....
    ^^^ speaking about cbfryman's jigsaw ability




    owner of Thread posts 11111 & 12345

    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

  5. #5
    Scarenius's Avatar
    Scarenius is offline Call me Ravo



    Join Date
    Jul 2004
    Location
    Michigan
    Posts
    479
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    Unless you're REALLY into all this, it shouldn't be all that big of a deal. At my usual 65% gain, I can hear no less distortion out of my amp than at 100%. I can hear the CLIPPING, yes, but that's because I have a good amp and cheap subs.

    I've listened to mine with my usual JVC 2.5 volts out and from a Blaupunkt with 1 volt outs. It isn't 2.5 times as loud with the JVC, if that sums up what you wanted to know.

    IMO, Higher pre-outs are good, but don't spend $180 to get a 4v HU when the exact same HU with 2 volts is only $100.



    Current Setup
    "Power is probably the least efficient way of increasing SPL."
    - Jmac

  6. #6
    jellyfish420's Avatar
    jellyfish420 is offline i design boxes .......



    Join Date
    Jul 2004
    Location
    STL ill side
    Age
    33
    Posts
    4,234
    Post Thanks / Like
    Images
    4
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    what if your outputs are only putting out .1V, yeah i took a DMM to my RCA's today and that was it. would it make a diff there?



    NEED A BOX DESIGN? PM ME


    HEAD UNIT
    860mp
    ACTIVE FRONT STAGE
    JBL GTO75.4 II
    RE 6.5
    VIFA XT25 ring radiator 1"
    SUB STAGE
    ega 1400d
    3HP FI
    STOLEN

  7. #7
    mrray13's Avatar
    mrray13 is offline uz some fegbags



    Join Date
    Dec 2001
    Location
    IL
    Posts
    3,633
    Post Thanks / Like
    Images
    16
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    Quote Originally Posted by jellyfish420
    what if your outputs are only putting out .1V, yeah i took a DMM to my RCA's today and that was it. would it make a diff there?

    yeah, it will make a difference. i had an old pioneer who's pre-out voltage was .5volts...changed to a 5.5volt sony..without changing amp settings..WOW..lol



    a lot louder and clipping galore!!! once amp was readjusted...no more clipping, but still louder...the mic proved that. with a pair of hx2 8's and a sony mobile es amp pushing them(rated 380wrmsx1, benched that as well)..the pioneer was a 134.5db(ACmic) the sony was 136.4(same mic)..threw a memphis 1000d on the subs with the sony..best of 139.6(same mic)...btw..all testing was done with all settings cranked..hehe




    higher pre-out is a good thing...jsut make sure amp settings are readjusted.





    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee



    Quote Originally Posted by lilmaniac2
    Your circles look like something a HMO doctor would do to a **** job ....
    ^^^ speaking about cbfryman's jigsaw ability




    owner of Thread posts 11111 & 12345

    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

  8. #8
    LIGHTBEING's Avatar
    LIGHTBEING is offline CarAudio.com Elite



    Join Date
    Jun 2004
    Location
    New Jersey
    Posts
    866
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    Hey guys,

    I ordered the Kenwood DDX-7015 unit and the preout voltage is 2. Is that gonna be a problem? If so, would the Kenwood Digital processor fix my problem? In my thread http://forums.caraudio.com/vb/showthread.php?t=72469 someone said that the processor will make it high voltage at 4.5. Is this something worth getting and does that peice work with components other then Kenwood? Is says something on the Kenwood site that you need Kenwood component to use some features.

    Thanks.




  9. #9
    preunnerv6's Avatar
    preunnerv6 is offline Member



    Join Date
    Feb 2004
    Location
    Depends on your point of view
    Posts
    59
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    I have an hu that is 2 volts and another that is 4.5 volts. Neither of them have alt. noise, both get loud and have a low noise floor. I simply adjust the gain to match the hu voltage. Isn't that what the gain on the amp is for??




  10. #10
    Scarenius's Avatar
    Scarenius is offline Call me Ravo



    Join Date
    Jul 2004
    Location
    Michigan
    Posts
    479
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: pre-out voltage

    Exactly! Higher voltage = good, but if it's THAT big of a concern, just by the $150 2v HU you like, get a $40 8v line drive, and be happy that's it's better than the $230 4v HU you almost bought.

    See my sig, I'm very very very cheap.



    Current Setup
    "Power is probably the least efficient way of increasing SPL."
    - Jmac

Closed Thread

Similar Threads

  1. Pre Amp Shut off!!
    By Hing in forum Head Units
    Replies: 0
    Last Post: 10-08-2004, 06:30 AM
  2. Replies: 6
    Last Post: 09-22-2004, 11:52 AM
  3. Just a Little important Fact that many of you may not know
    By CarAudioAddict in forum Wiring, Electrical and Installation Help
    Replies: 35
    Last Post: 11-16-2002, 11:27 PM
  4. pre out voltage??
    By slipknot87420 in forum Subwoofers
    Replies: 14
    Last Post: 10-21-2002, 01:42 AM

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts

1e2 Forum