Closed Thread
Results 1 to 10 of 10

Reload Thread: Help me figure out why amp is going to protect mode....

  1. #1
    GhettoBlaster's Avatar
    GhettoBlaster is offline Junior Member



    Join Date
    Sep 2011
    Location
    Arkansas
    Posts
    6
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Help me figure out why amp is going to protect mode....

    I have a RF R500-1 amp powering two RF P2D210 subs (500W RMS amp powering 2-300W subs). Subs are DVC and are wired in parallel at 4 ohm's each for 2 ohm's total. Amp is supposed to be 2 ohm stable. After a while of listening rap music or any music with lots of bass, amp goes into protect mode and is hot enough I can only put my hand on it for a couple seconds. I got my multimeter out this morning. With the car running and playing a song with lots of bass at semi loud level, the volts at the amp never drop below 14.25V so I don't think I'm in a low volt/hi current condition. I tried to test the ohms at the amp and the meter fluctuates between 0 and 6 ohms. Don't know if I'm testing the ohms wrong or the meter isn't working properly, although it does seem to be testing the volts just fine.

    Any suggestions....please help!!!!!







  2. #2
    DDtC's Avatar
    DDtC is online now High Output SQ



    Join Date
    Apr 2011
    Location
    Va Beach, Va
    Age
    33
    Posts
    7,439
    Post Thanks / Like
    Mentioned
    47 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    what are your HU settings and amp settings? Bass, Gain, Bass boost?



    • 2010 Scion tC
    • Pioneer DEH-80PRS
    • JL 450/4v2 Active (Mid range, tweeters) JL 300/2v2 (Mid bass) DD M4(Subs)
    • Hertz HV 165XL
    • Hertz HT28
    • JL ZR800
    • 2 x DD 9512i
    • Singer 300 amp 15.1v bypass, 3 XS D3400s
    • Viper 5701 with Smart Start

  3. #3
    >>SQL<<'s Avatar
    >>SQL<< is offline CarAudio.com Elite



    Join Date
    May 2011
    Location
    USA
    Posts
    1,457
    Post Thanks / Like
    Mentioned
    1 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    I think you have it wired to 1 ohm
    If those subs are Dual 4 ohm coils then your final load will be either 1 ohm or 4 ohms
    It works like this each coil is 4 ohms, both coils tied together on each speaker makes it 2 ohms, then both speakers tied together gives you 1 ohm

    To use your DMM to check you ohm load you should disconnect the speaker wires from the amp then touch the dmm to the wires.




  4. #4
    GhettoBlaster's Avatar
    GhettoBlaster is offline Junior Member

    Threadstarter


    Join Date
    Sep 2011
    Location
    Arkansas
    Posts
    6
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    Quote Originally Posted by HazeGrey75 View Post
    what are your HU settings and amp settings? Bass, Gain, Bass boost?
    HU bass is flat. I have a HU amp/sub out volume that is set on 5 out of 8. My amp gain is about half of max and bass boost is 1/4 to 1/2 of max.




  5. #5
    GhettoBlaster's Avatar
    GhettoBlaster is offline Junior Member

    Threadstarter


    Join Date
    Sep 2011
    Location
    Arkansas
    Posts
    6
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    Thanks on the "how to" and I will retest, but I'm quite certain I've got them wired up correctly. I don't do much car audio stuff, but I've taken a years worth of circuits classes in college. Car audio = DC= easy......AC circuits......not so easy.

    I came up with the wiring myself and then consulted the sub owners guide and it agreed with what I came up with. Each speaker has two voice coils that are two ohms a piece. The voice coils are wired in series so each speaker is a 4 ohm load. Then the speakers are wired in parallel for a 2 ohm load on the amp.




  6. #6
    >>SQL<<'s Avatar
    >>SQL<< is offline CarAudio.com Elite



    Join Date
    May 2011
    Location
    USA
    Posts
    1,457
    Post Thanks / Like
    Mentioned
    1 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    Quote Originally Posted by GhettoBlaster View Post
    Thanks on the "how to" and I will retest, but I'm quite certain I've got them wired up correctly.

    I came up with the wiring myself and then consulted the sub owners guide and it agreed with what I came up with. Each speaker has two voice coils that are two ohms a piece. The voice coils are wired in series so each speaker is a 4 ohm load. Then the speakers are wired in parallel for a 2 ohm load on the amp.
    yes if those speakers are Dual 2 ohm then the way you described is correct.
    however a quick check with the DMM would be best.




  7. Thanks GhettoBlaster thanked for this post
  8. #7
    GhettoBlaster's Avatar
    GhettoBlaster is offline Junior Member

    Threadstarter


    Join Date
    Sep 2011
    Location
    Arkansas
    Posts
    6
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    Quote Originally Posted by crispin View Post
    yes if those speakers are Dual 2 ohm then the way you described is correct.
    however a quick check with the DMM would be best.
    I've tested and I am getting .9 ohm at the amp. I've checked the wiring and it is correct. This is news isn't entirely bad though. If I wire my speakers in series I'm guessing I should get ~4 ohm which will still give me enough power, my amp will run a lil cooler and my sound quality will be a lil better. I kinda wished I bought the dual 4 ohm coils so I could run with a 4 ohm resistance at my amp anyway.



    Now, since I'm running my speakers in series....will I need a larger gauge speaker wire???




  9. #8
    Jd377's Avatar
    Jd377 is offline Member



    Join Date
    Apr 2011
    Location
    Kansas City, MO
    Posts
    40
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    Is your voltage good enough at the amp?




  10. #9
    GhettoBlaster's Avatar
    GhettoBlaster is offline Junior Member

    Threadstarter


    Join Date
    Sep 2011
    Location
    Arkansas
    Posts
    6
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    JD377...With car running and music playing at semi loud levels, voltage never went below 14.25

    Quote Originally Posted by crispin View Post
    I think you have it wired to 1 ohm
    If those subs are Dual 4 ohm coils then your final load will be either 1 ohm or 4 ohms
    It works like this each coil is 4 ohms, both coils tied together on each speaker makes it 2 ohms, then both speakers tied together gives you 1 ohm

    To use your DMM to check you ohm load you should disconnect the speaker wires from the amp then touch the dmm to the wires.
    Thanks for the help with the meter. Got 'em wired in series and have 3.5 ohms at the amp now. Pushed 'em about as hard as I did before when amp went into protect and didn't have any problems and the amp was a lot cooler. Then a couple hours later I pushed 'em real hard (harder than I would for normal listening purposes) for twice as long as they were running. Amp got hot but nothing shut off. Seems to be working like it should now.




  11. #10
    akheathen's Avatar
    akheathen is offline trianoacitol contraceptiv akheathen is a Supporting Member of the forum!



    Join Date
    Jan 2011
    Location
    Anchorage AK
    Age
    32
    Posts
    2,254
    Post Thanks / Like
    Mentioned
    22 Post(s)

    Re: Help me figure out why amp is going to protect mode....

    something is not right....... you should be reading 8ohms, by your description (2+2+2+2=8) also, it should be just fine series-paralleled to 2ohms. check the battery in the meter, and re-test the speakers. also helps to check the ohms of a known good speaker, like a house speaker... individual coils would be best at this point. it is also possible that you are simply clipping it hard, and the protection mode, is just doing it's job and protecting from burning stuff up. btw- amps are ac, lol....just saying



    *IF I have forgotten to exchange feedback, please let me know*
    i buy broken amps....
    No, i will not "gift" paypal. please do not even make it awkward by asking. if the fees are an issue, I am usually inclined to add them. unless you have discount elsewhere, shipping is through usps flat rate, through usps parcel post, or through the roof..... i am in alaska. thanks
    -Heath H-

Closed Thread

Posting Permissions

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

1e2 Forum