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Originally Posted by Zippy
I'm an electrical engineer with over 15 years experience.
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Congrates ... so ou know electricity. Do you have done some thing with accoustics? Let me guess ... the only frequencies you have experience with are those on highvoltage wires? This makes you of course an expert in this discussion ...
I am doing car hifi competition for over 8 years - and I am far far away form being an expert.
Quote:
Originally Posted by Zippy
Damping Factor is a measure of an amplifiers control over a mechanical motion of the speaker attached. A rating of 50 is sufficient to control a subwoofer with a 3" voice coil. The Audison SRX4 has a damping factor of 140. Please explain why you think this is an issue.
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Most digital Amps have a low damping factor, so they can not control speakers well. I prefer damping factors >>200 and a high slew rate. This leeds to perfect hights and a midsub down to 40hz without any problems (3 way setting). Because we are talking about a 2 way setting, the midsub can not be cut early, so there will always be less punch.
Quote:
Originally Posted by Zippy
Lack of power will cause both shrill highs and lack of punch from midrange/midbass. The higher frequencies require short movements in the voice coil to reproduce sound. As a result, they require less power to be reproduced by speakers. This will cause what some describe as a bias towards the high end or a shrill sound. With midrange/midbass you are requiring the speaker to move a greater distance to produce the lower frequency waves. Too little power will cause those frequencies to not be produced. Since the lower frequencies require more power to be produced a lack of power will also drown them out. IE no punch to them.
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Disagree ... the AMA amplifiers (class A) for example ... i think 50Watt and a high damping factor. They can keep a subwoofer busy (!)
and "bias towards the high end or a shrill sound" bias is a function to controll the switching point of an amplifier from class a to class b
Quote:
Originally Posted by Zippy
Too weak mounting...Car audio component speakers are designed to be mounted free air. Yes, sealing the doors and sound deadening them will produce more midbass; however they should be able to produce midbass without it. The fact they are not tells me that they may not be getting enough power.
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This is a strong mounting:
Most people use cheap plastic rings where the speaker can move a bit. And only some few of the car speakers a build for free air, most are for big volume and some others are for close volume (tweeters, midrange but also midsub)
And you need deadning material ... otherwise the power of the speaker will be consumed by dissortions and vibrating walls.
Quote:
Originally Posted by Zippy
Wrong filter setting...This may be an issue for the midbass if he has the headunit crossed over too high or the amp crossed over to high. The Polk set will produce 40-20K according to the manufacture site. I doubt that 40 hertz will be a realistic expectation, but they should be able to get to 60-80 hertz easy. Also this will not cause the shrill sound of the tweeters the OP mentioned.
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Please do not forget the flank ... -6db/oct has a different behavior as -12db/oct. Cutting at 40Hz with -12db can lead to less punch, while cutting at 80Hz with -6db can sound great.
Shrill sound can be a peak in teh range 2000 to 4000hz. Maybe he should check with some RTA program/app (?)
Quote:
Originally Posted by Zippy
Ideally powering a speaker with more power than it is rated for will get you better sound quality by reducing distortion introduced by increasing gains and giving the speakers a better dynamic headroom. Any quality installer will tell you that they will gladly run a 1000 watt amp to your tweeters as long as they have the ability to reduce the input levels through a DSP or EQ.
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Nope ... any quality installer will rely on quality products he knows well. nobody puts 1000W to a 50W Highend tweeter. The bigger the coil the more overpower ... subs up to +100% ... tweeter up to +50%. You have to meet the the best amplifier point (were the amplifier work hardly stable without any curve). mostly this something between 50 to 80% performance depending on the amplifier (-> therefore overpower)