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Thread: Can I run this amp with this sub, how do ohms work, help/recommendations...

  1. #31
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    Quote Originally Posted by IC-C30 View Post
    Now I've already spent $4000 since and far from ready. I never planned on spending that muc, I just rolled in this hobby and once you're past the point of dreaming about those nice installs and actually get a nice install yourself, you can never go back
    isn't that the truth?!

    I always tell people "Welcome to the adiction"
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  2. #32
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    i don't think i'm to that point yet! still in college, i need to get out and get a fulltime job before i start running with you big dogs

  3. #33
    Newbie TheQuinsta's Avatar
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    Quote Originally Posted by mikeym View Post
    OHH!!!

    how did you blow up that HU exactly? my buddy blew up one and he was trying to power 500 watt subs with the bazooka i'm using now... i don't think i'm in any danger as I do a lot of fusing. But I'm curious

    ~mikeym
    I didnt run my own negative wire to the chassis i used the black wire on the loom which ended up being a positive feed for the back light on the original HU. so when the lights got turned on the earth got lost and the HU had twelve volts up the a$$ and the HU started to smoke. from then on i always run my own earth to the chassis no matter what.

    Fusing only needs to be on the MEMORY and ATT wires of your HU and one on the main feed of the amp/s i went and brouhgt a 80AMP circuit breaker which is resetable and easy to use, i did here the other day thou that a std 4 ch amp only draws bout 3 AMPS fully maxed.

  4. #34
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    Quote Originally Posted by TheQuinsta View Post
    I did here the other day thou that a std 4 ch amp only draws bout 3 AMPS fully maxed.
    Only drawing 3 amps off a 12 volt battery gives you a total of 36 Watts. Which means 9 watts a channel. Pretty sure that would be 9W peak not RMS which would give 6W RMS per channel for a pure sine wave - probably less for music.

    My point being that amplifiers draw a lot more than 3 amps, which is why you are using an 80 amp circuit breaker. If your amplifier only drew 3 amps your circuit breaker would be completely ineffective.

    Spuzzdawg

  5. #35
    Newbie TheQuinsta's Avatar
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    Quote Originally Posted by spuzzdawg View Post
    Only drawing 3 amps off a 12 volt battery gives you a total of 36 Watts. Which means 9 watts a channel. Pretty sure that would be 9W peak not RMS which would give 6W RMS per channel for a pure sine wave - probably less for music.

    My point being that amplifiers draw a lot more than 3 amps, which is why you are using an 80 amp circuit breaker. If your amplifier only drew 3 amps your circuit breaker would be completely ineffective.

    Spuzzdawg
    Well that is just what i was told and as for the breaker being ineffective thats incorrect the breaker is only htere to give protection to the main cable to the amp it does not protect the amp itself thats what the fuses on an amp are for.

    Where did you get your workings from thou i assume you use a power triangle to calculate the power due to current and volts but when do you take into the equation of the amplification?????? thats what an amp does ????
    Wassup Manus

  6. #36
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    It's a very basic equation, outlined in this wiki: http://www.mp3car.com/wiki/index.php/Amplifier
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  7. #37
    Newbie TheQuinsta's Avatar
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    Yeah thats fair enough but i learnt those back when i was 16 thats for a primary side of a amplifier (its like working with a transformer ) you calculate for the input and thats fine but its relation to the output of the amp is way different thats what a mosfet does takes a small input (for arguements sake make this value 1) and amplifys it effectivly making the output (for arguements sake 4) depending on the type of mosfet and its switching capacity, you double these mosfets up and effectivly make the output (for arguements sake 8).
    Like i said i heard that was what the amp was drawing but i havent done the test myself so i cant dispute it.
    Wassup Manus

  8. #38
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    It would have to be a tiny amp to only draw 3 amps. Something along the lines of a head unit.

    I'm not sure I understand where you're going with the first comment in your post.

    I'm not understanding where you're going with this?

    Are you trying to determine the wattage output? If so, most amplifier classes have a given efficiency with them that you can use to give you a rough estimate on power output.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  9. #39
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    Unhappy ohms

    i want to know if i have done this right

    i got a Behringer EP4000 EP2500 amps and 2x B1800X PRO + 2x Eurolive B212XL

    i got both in stereo but i dont hvor how much ohms i got.

    i wonder if any of you ppl knew


    i got the subs on EP4000 and the B212XL on EP2500

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