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    problems with voltage on amp while settings gains

    Alright I was setting my gains on my Hifonics BX1605D amp today. I have a JVC AVX2 cd player. I turned everything on flat and turned the volume to 35/50. I turned the gain on my amp all the way up and I think it only went to 29 volts, when I am needing 40 volts. So I turned the amp down a tad so it wouldn't be maxed out and I ended up having to turn up the subwoofer level to plus 8 on my cd player as well as the 60 hz boost to +2 on the cd player. After I made those adjustments the DMM showed 40.4.

    What is causing this?



    Headunit:
    JVC AVX2 (3.5" Screen)
    Mids and Highs:
    Kicker 6 1/2" door speakers
    Four 3 1/2" Kicker Speakers in the sub wall
    Subs:
    Two 2006 15" Kicker L7s
    Amps:
    Kicker KX120.2 for Mids and Highs
    Kicker KX2500.1 for Subs
    Box:
    8 Cube wall tuned to 50 hz for comp and 36 hz for daily.
    150.4 db @ 47 hz on TL with 3 day old subs. Done a 156.8 since then on Audiocontrol
    Refs: 1 Hugh Jass, k4rts, vitveet, pioneerpimp, Colt9699, caligirl2k




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    Re: problems with voltage on amp while settings gains

    What test frequency were you using?

    0db, -3db, -6db?

    You will probably need to provide that info so someone can help you.




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    Re: problems with voltage on amp while settings gains

    Sorry about that

    50 hz -6 db



    Headunit:
    JVC AVX2 (3.5" Screen)
    Mids and Highs:
    Kicker 6 1/2" door speakers
    Four 3 1/2" Kicker Speakers in the sub wall
    Subs:
    Two 2006 15" Kicker L7s
    Amps:
    Kicker KX120.2 for Mids and Highs
    Kicker KX2500.1 for Subs
    Box:
    8 Cube wall tuned to 50 hz for comp and 36 hz for daily.
    150.4 db @ 47 hz on TL with 3 day old subs. Done a 156.8 since then on Audiocontrol
    Refs: 1 Hugh Jass, k4rts, vitveet, pioneerpimp, Colt9699, caligirl2k

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    Rich B's Avatar
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    Re: problems with voltage on amp while settings gains

    If Im reading the gain setting tutorial correctly here on CA, I believe you're supposed to use a 0db (or -3db) frequency.

    Wish I could be of more help, but hopefully someone will see this bump.




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    Re: problems with voltage on amp while settings gains

    Quote Originally Posted by Rich B View Post
    If Im reading the gain setting tutorial correctly here on CA, I believe you're supposed to use a 0db (or -3db) frequency.

    Wish I could be of more help, but hopefully someone will see this bump.
    It is recommended that you use 0 db or -3 db but you can even use up to -10 db.

    Anyways thank you for attempting to help.



    Headunit:
    JVC AVX2 (3.5" Screen)
    Mids and Highs:
    Kicker 6 1/2" door speakers
    Four 3 1/2" Kicker Speakers in the sub wall
    Subs:
    Two 2006 15" Kicker L7s
    Amps:
    Kicker KX120.2 for Mids and Highs
    Kicker KX2500.1 for Subs
    Box:
    8 Cube wall tuned to 50 hz for comp and 36 hz for daily.
    150.4 db @ 47 hz on TL with 3 day old subs. Done a 156.8 since then on Audiocontrol
    Refs: 1 Hugh Jass, k4rts, vitveet, pioneerpimp, Colt9699, caligirl2k

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    Re: problems with voltage on amp while settings gains

    You should have a subwoofer level control on your headunit. When setting the voltage on your amp, that should be all the way up since what your setting your amp to will be the maximum gain setting on it. So turn it all the way up and try resetting your gain, and I bet you'll have better luck.




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    Re: problems with voltage on amp while settings gains

    volume 35/50 seems quite low.




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    Re: problems with voltage on amp while settings gains

    Quote Originally Posted by BlkonBlkFG View Post
    You should have a subwoofer level control on your headunit. When setting the voltage on your amp, that should be all the way up since what your setting your amp to will be the maximum gain setting on it. So turn it all the way up and try resetting your gain, and I bet you'll have better luck.
    It was already all the way up on plus 8

    With that turned up I still had to turn the 60 hz boost to +2 on the head unit.

    This is still with the amp turned pretty much all the way up.



    Headunit:
    JVC AVX2 (3.5" Screen)
    Mids and Highs:
    Kicker 6 1/2" door speakers
    Four 3 1/2" Kicker Speakers in the sub wall
    Subs:
    Two 2006 15" Kicker L7s
    Amps:
    Kicker KX120.2 for Mids and Highs
    Kicker KX2500.1 for Subs
    Box:
    8 Cube wall tuned to 50 hz for comp and 36 hz for daily.
    150.4 db @ 47 hz on TL with 3 day old subs. Done a 156.8 since then on Audiocontrol
    Refs: 1 Hugh Jass, k4rts, vitveet, pioneerpimp, Colt9699, caligirl2k

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    Re: problems with voltage on amp while settings gains

    does the amp have a voltage selector for the input sensitivity? if so, switch it over and reset. see if that helps.




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    Re: problems with voltage on amp while settings gains

    Your problem is with your tone, at -6db thats wayy to low for a DD. You should use a 0 or +3 tone, sub level on deck should be maxed out, bass boast at zero and turn your hu to about 40-43. Try a new tone, preferbly +3 and come back if theres still a problem.




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    Re: problems with voltage on amp while settings gains

    leave everything set flat and try setting the gain on volume 48/50




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    Re: problems with voltage on amp while settings gains

    does it really matter which way it reaches the desired voltage? Shouldnt 40 volts be 40 volts however you get to it? I'm sure i'm wrong...but just curious.



    Headunit:
    JVC AVX2 (3.5" Screen)
    Mids and Highs:
    Kicker 6 1/2" door speakers
    Four 3 1/2" Kicker Speakers in the sub wall
    Subs:
    Two 2006 15" Kicker L7s
    Amps:
    Kicker KX120.2 for Mids and Highs
    Kicker KX2500.1 for Subs
    Box:
    8 Cube wall tuned to 50 hz for comp and 36 hz for daily.
    150.4 db @ 47 hz on TL with 3 day old subs. Done a 156.8 since then on Audiocontrol
    Refs: 1 Hugh Jass, k4rts, vitveet, pioneerpimp, Colt9699, caligirl2k

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    Re: problems with voltage on amp while settings gains

    From what you've mentioned, the biggest difference will come from using a 0dB 50Hz test tone instead of a -6dB tone.

    The goal is to play something that represents the MAX you would listen to. This is a setting you should never surpass, or you risk clipping your amp and causing damage. Just remember never to surpass the settings you use to set your voltage.

    As was said before, sub level should be maxed and bass boost should be flat or 0. Volume should be at a level that represents the loudest you plan on listening to, or about 80%, whichever comes first. Obviously if you hear distortion turn it down.




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    Re: problems with voltage on amp while settings gains

    but does it really matter which way you reach the desired voltage?

    For example:
    Setting the headunit to 30/50 but turning on bass boosts on HU then setting amp VS leaving everything flat and turning the HU up to 40/50.

    Each way it reaches 40 volts on the DMM.

    That was just an example.



    Headunit:
    JVC AVX2 (3.5" Screen)
    Mids and Highs:
    Kicker 6 1/2" door speakers
    Four 3 1/2" Kicker Speakers in the sub wall
    Subs:
    Two 2006 15" Kicker L7s
    Amps:
    Kicker KX120.2 for Mids and Highs
    Kicker KX2500.1 for Subs
    Box:
    8 Cube wall tuned to 50 hz for comp and 36 hz for daily.
    150.4 db @ 47 hz on TL with 3 day old subs. Done a 156.8 since then on Audiocontrol
    Refs: 1 Hugh Jass, k4rts, vitveet, pioneerpimp, Colt9699, caligirl2k

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    Re: problems with voltage on amp while settings gains

    bass boost is a no no around here



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