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Thread: jl audio subs

  1. #11
    Variable Bitrate StrataG's Avatar
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    Quote Originally Posted by racerx3165
    Well i assumed you was one of thoose guys who thinks he can get 1000w out of a 20$ ebay amp, so i was trying to prove to you with a Law why those 1000W faceplates are not true I know that it truely matters what your input signal is so if you got a 4V input your looking more like 120W.
    And what about amps that are truly 1000+ watts that generate that on the same 14.4V? I'm not an expert, nor do I claim to be, but I do believe you are talking out of your ...

  2. #12
    Constant Bitrate zzachattack2's Avatar
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    Quote Originally Posted by racerx3165
    Then you should know to put a ampmeter in there or simply go by your fuse size you can get a more accurate guestamate. Say you got 14.4V and 40 amps you are at 576W
    Right, an mm should be the best way to figure this, but I'd rather know before buying and then finding out.

    That formula should work, but for amplifiers it tends not to always follow that trend, for instance 14.4V at 40amps at 1 ohm should yeild 576W and 14.4V at 40amps at 2ohms should yeild 288W and 14.4V at 40amps at 4ohms should yeild 144W right? So it follows a linear relationship. However in most amplifiers I've looked at, their 1,2,4 ohm rated outputs do not follow that linear relationship so it must be something designed into the amplifier.

    I suppose just using those three (1,2,4 ohm) rated outputs into a list on my TI83 and finding the regression which follows it the best(and runs through the origin of course) might be the best way to estimate.

    Edit: ^^ forgot, the graph shouldn't run through the origin, obviously a higher number, based off the graph it looks like it should creates an asymptote at resistance = 0, so infinity i suppose.

  3. #13
    Variable Bitrate StrataG's Avatar
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    Quote Originally Posted by zzachattack2
    I suppose just using those three (1,2,4 ohm) rated outputs into a list on my TI83 and finding the regression which follows it the best(and runs through the origin of course) might be the best way to estimate.
    I guess that would be the most logical thing to do. Didn't know you didn't have the equipment yet. If you don't already have the equipment though, why give yourself that many variables and possible problems?

  4. #14
    Constant Bitrate zzachattack2's Avatar
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    Quote Originally Posted by StrataG
    I guess that would be the most logical thing to do. Didn't know you didn't have the equipment yet. If you don't already have the equipment though, why give yourself that many variables and possible problems?
    I just want to make sure what kind of power I would be giving a sub, before I actually buy the amplifier and be screwed or disappointed.

  5. #15
    Constant Bitrate racerx3165's Avatar
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    Quote Originally Posted by StrataG
    And what about amps that are truly 1000+ watts that generate that on the same 14.4V? I'm not an expert, nor do I claim to be, but I do believe you are talking out of your ...
    Since everyone has an opinion i guess Georg Simon Ohm could have been thinking outta his ... but who knows they did make it a law unlike the electron theory! To get 1000 watts you have to increase your amperage; wattage and amperage are proportional. Where as resistance and wattage are inversely proportional. But come to think of it i did have Chili.....
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  6. #16
    Variable Bitrate StrataG's Avatar
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    Quote Originally Posted by racerx3165
    Since everyone has an opinion i guess Georg Simon Ohm could have been thinking outta his ... but who knows they did make it a law unlike the electron theory! To get 1000 watts you have to increase your amperage; wattage and amperage are proportional. Where as resistance and wattage are inversely proportional. But come to think of it i did have Chili.....
    My post was relating to the one I quoted as your second one appeared while I was writing. My point however is there are other factors that nullify the validity of those numbers. He knew ohm's law, but it is not as simple as that in this situation.

  7. #17
    Underachiever ACHIEVER's Avatar
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    OMG! Racerx, I don't know if you think you're being helpful or what, but seriously it seems as though you don't understand the topic as well as you think. It's nice to help people, but if you give useless, misleading, or flat out incorrect information you are only doing everyone a disservice. The problem is others that know less will come along and believe everything you've said, without questioning you as the posters in this thread have. Please think twice about the help you offer. I assume you have a good understanding of certain electrical aspects and systems. But this and your PSU thread have shown you have much to learn yet. I hope you're not too offended with my comments, take them with a grain of salt if you must. But you're confusing topics that are taught in high school level electricity. I would think someone of high learning such as yourself would have a better grasp.

  8. #18
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    shouldnt be tuning with a Multi Meter anyways. Use your ears. if you can't hear the distortion, you are fine. you get no benefits by knowing by number how much power you are sending your subwoofer anyways.

    again, the best tool for tuning is your ear. always

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