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Reload Thread: this installer deserves to be UNinstalled from car audio with this story he told me..

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    Icon11 this installer deserves to be UNinstalled from car audio with this story he told me..

    ok so i go to a car audio store out of my town yesterday after work and it's in a big city about 3 times the size of my town and i ask this guy about amps and it's power output to speakers(mainly subs) and i go if an amp says it puts out so and so watts for example 500 rms at 4 ohms then willl that amp put out that SAME power ALLL the time? and the guy thinks for a minute then responds "yeah it will do that, like with rap music and such" i don't think i can believe that, cuz music has alot of transients in it and the voltage is gon vary from high to low right? so theres no way of tellin how much power you get unless you do the gain tutorial and see how much your amp can produce at that frequency. anyways just a short bullshit car audio story again from me, i'm never goin to that car audio store again. lol and i did a test and set my amp on full range to see the difference in voltage at the same volume level as i had it on lowpass and the AC voltage was sooo much higher and actually hittin near it's supposedly said "200 rms at 4 ohms bridged, guess it all depends on the song and the bass it has. the amp to sub power issue has always been interestnig to me. lol just thought i'd share this story with you guys and my thoughts on it. most of you guys here i bet wish you had an amp that would do a certain number allllll the time but hey it's car audio and it can't be perfect, can only be close. and i don't even think music is recorded at 0 dbs if it would then our amps and subs would perform much better, thats just my opinion though, what your guys' thoughts on this? i'd like to know







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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    si senor




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    Crest factor

    If you take a given amplifier, let's say 100 watts and operate it just below clipping with music material, the "Crest Factor" of the amplifier's output is equivalent to the "Crest Factor" of the program material.

    "Crest Factor" is the difference between the average level of the signal and its peak level. For example, a pure sine wave has a "crest factor" of 3dB, meaning that it's peak level is 3dB higher than its average level. We all know that 3dB represents a power factor of 2, so another way to look at it is that the peak power of the signal is twice that of its average level. So, if we play a sine wave on our 100 watt amplifier, just below its clipping level, the average power (over time) the speaker is needing to dissipate is 50 watts.

    A true square wave, by comparison, has a crest factor of 0db, so it has equal average and peak power. Our 100 watt amplifier, playing a square wave, unclipped, into our speaker requires that the speaker dissipates 100 watts of power (twice the heat as a sine wave).

    Music has a significantly higher crest factor than sine waves or square waves. A highly dynamic recording (Sheffield Lab, Chesky, etc.) typically has a crest factor of 20dB or more, meaning that its average power is 100 times lower than its peak power. So, if we play our 100 watt amplifier just below clipping with the typical audiophile recording our speaker is only needing to dissipate 1 watt of average power over time.

    Modern commercial recordings typically exhibit crest factors of around 10dB, meaning that the average power is 10 times lower than the peak power. So, our 100 watt amp just below clipping would deliver an average power over time of 10 watts that the speaker has to dissipate.




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    well that *****.




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    Re: Crest factor

    Quote Originally Posted by Volenti
    If you take a given amplifier, let's say 100 watts and operate it just below clipping with music material, the "Crest Factor" of the amplifier's output is equivalent to the "Crest Factor" of the program material.

    "Crest Factor" is the difference between the average level of the signal and its peak level. For example, a pure sine wave has a "crest factor" of 3dB, meaning that it's peak level is 3dB higher than its average level. We all know that 3dB represents a power factor of 2, so another way to look at it is that the peak power of the signal is twice that of its average level. So, if we play a sine wave on our 100 watt amplifier, just below its clipping level, the average power (over time) the speaker is needing to dissipate is 50 watts.

    A true square wave, by comparison, has a crest factor of 0db, so it has equal average and peak power. Our 100 watt amplifier, playing a square wave, unclipped, into our speaker requires that the speaker dissipates 100 watts of power (twice the heat as a sine wave).

    Music has a significantly higher crest factor than sine waves or square waves. A highly dynamic recording (Sheffield Lab, Chesky, etc.) typically has a crest factor of 20dB or more, meaning that its average power is 100 times lower than its peak power. So, if we play our 100 watt amplifier just below clipping with the typical audiophile recording our speaker is only needing to dissipate 1 watt of average power over time.

    Modern commercial recordings typically exhibit crest factors of around 10dB, meaning that the average power is 10 times lower than the peak power. So, our 100 watt amp just below clipping would deliver an average power over time of 10 watts that the speaker has to dissipate.
    Very nice info



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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    an installer at local shop told me he hit 170db with 2 12" L7's another installer at a different local shop said his car has hit over 200 db but he got beat by someone at his last comp and that person that beat him was only using a 600 watt kenwood amp............. I talk to people all the time that get ripped off by these 2 shops repeatedly.




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    hmm i wonder how much those 2 12'' L7's had to hit that decibal mark. *thinks deep*




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    Quote Originally Posted by luvinthebass
    ok so i go to a car audio store out of my town yesterday after work and it's in a big city about 3 times the size of my town and i ask this guy about amps and it's power output to speakers(mainly subs) and i go if an amp says it puts out so and so watts for example 500 rms at 4 ohms then willl that amp put out that SAME power ALLL the time? and the guy thinks for a minute then responds "yeah it will do that, like with rap music and such" i don't think i can believe that, cuz music has alot of transients in it and the voltage is gon vary from high to low right? so theres no way of tellin how much power you get unless you do the gain tutorial and see how much your amp can produce at that frequency. anyways just a short bullshit car audio story again from me, i'm never goin to that car audio store again. lol and i did a test and set my amp on full range to see the difference in voltage at the same volume level as i had it on lowpass and the AC voltage was sooo much higher and actually hittin near it's supposedly said "200 rms at 4 ohms bridged, guess it all depends on the song and the bass it has. the amp to sub power issue has always been interestnig to me. lol just thought i'd share this story with you guys and my thoughts on it. most of you guys here i bet wish you had an amp that would do a certain number allllll the time but hey it's car audio and it can't be perfect, can only be close. and i don't even think music is recorded at 0 dbs if it would then our amps and subs would perform much better, thats just my opinion though, what your guys' thoughts on this? i'd like to know
    at first I thought he was going to tell you that the max power was continuous or something..if you want to get technical about it then yeah you're right but if my installer has a pretty good general knowledge about car audio and is real good at installing I think that's fine. I mighta missed something in your post, sorta just skimmed through it but yeah





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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    lol if he said the max power was continuous i would never get my **** installed at that store! then i'd call him a ****in moron and tell him i know more car audio **** then him.




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    Quote Originally Posted by ZeroGuage
    an installer at local shop told me he hit 170db with 2 12" L7's another installer at a different local shop said his car has hit over 200 db but he got beat by someone at his last comp and that person that beat him was only using a 600 watt kenwood amp............. I talk to people all the time that get ripped off by these 2 shops repeatedly.
    200+db, is that even possible?



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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    Quote Originally Posted by luvinthebass
    so theres no way of tellin how much power you get unless you do the gain tutorial and see how much your amp can produce at that frequency.
    bah O-scope FTW!




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    Quote Originally Posted by supraman1379
    200+db, is that even possible?
    tecnically no, DB limit is 194




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    yes, 200+dbs is possible.
    194 is the sinusoidal limit of air, the point at which it transforms into shockwaves.

    oh yeah, and tcabs 1 type r 10.



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    Re: this installer deserves to be UNinstalled from car audio with this story he told

    some noob i know with 2x g5's says he hits in the 160's and this guy at his old store hit 220db ... that bs and max watts is very anoying




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    Re: this installer deserves to be UNinstalled from car audio with this story he told me..

    lol @ 220 DB.


    pretty sure that would kill him.

    Quote Originally Posted by iamamp3pimp
    lol @ 220 DB.


    pretty sure that would kill him.

    seeing how its only possible underwater or so...


    I am teh win for quoting myself, in my post, about what i just said



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