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Old 22nd November 2007, 05:29 PM   #11
AndrewT is offline AndrewT  Scotland
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Default Re: need help!!speaker power

Quote:
Originally posted by mariusb007
I bought some speakers for my car and I prefer tu build an ampifier in order to use them max,
To build an amplifier for car use, it must be designed to operate from 12Vdc and maybe 13.8Vdc if the engine is kept running.

That requires either very low power or a double design exercise to build a high voltage power supply AND a power amplifier to match.
That project is certainly not for beginners.

Buy a power amp.
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Old 22nd November 2007, 05:56 PM   #12
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must disappoint you ,
I'm not a beginner

& have already built an SMPS-power amp, which works fine at 12-14 volt
the probl is that it's a small one ,only 2x40W, and I'd like to upgrade it....
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Old 22nd November 2007, 06:09 PM   #13
AndrewT is offline AndrewT  Scotland
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sorry,
I read into post1 a lot more than maybe I should have.
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Old 22nd November 2007, 08:42 PM   #14
jol50 is offline jol50  United States
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Most of the car amps I have checked, not that many, run a rail voltage of +/-30 to 50v. They are rated from 50x2 to 800 depending on ratings type and how they are built. The alpine I used is a 3518 that can be seen on the ampguts site. It is just not large enough to make lots of bass. I did use it once in a small truck to run 2 8" subs and it was respectable in that small space. On the high side of a crossover it will do much better, 2 ohm load and better yet. It is very clean and runs hot, but sounds great. Don't know the details, but also this amp will break up quickly at its limit. I like that a lot, then it plays clean all the time and when you go over the limit you know for sure that is too far. I don't like amps that distort a little, then a little more with more volume....you end up running high power with distortion before you realize, can't tell precisely when it starts to distort either.
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Old 27th November 2007, 07:21 PM   #15
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well,
that means your alpine has a quality power supplay in fact amplifiers dat don't have a good p.supplay they distort a little, then a little more with more volume....
It also depend on what kind of music do you listen to....here are some topics
http://www.michael.mardis.com/sonic/sonic3.htm
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Old 27th November 2007, 08:16 PM   #16
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Marius,

I notice that nobody has answered your last question yet.

White noise has equal energy at all frequencies. The noise you hear between FM stations is an example of "white noise".

Pink noise has equal energy in each octave of the audio spectrum.
Audio engineers use pink noise to set graphic equalizers to give an audio system a "flat" frequency response.

Larry
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Old 27th November 2007, 10:11 PM   #17
jol50 is offline jol50  United States
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I listen to various types of music, mostly rock/alt of one kind or another is the loud kind for me. This amp I have now is a 5ch and the subs work nice. The high side will go into distortion slowly, and will if the subs are on or off, at the same place on the head unit. I have recommended wire size on it, almost seems like input overloading but have a 2V HU on it. I does not care if there is a mid bass hit, it just distorts all the time at that level. Other amps I consider better would drop into distortion with a bass hit. They would stay clean at that volume if you turned the crossover point higher. They have a very fine line between clean and lots of distortion.

Good reading on the class D amp by the way, thanks.
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