million dollar question

[joshpoints 10+ year member]

Is anyone in this forum a genius in the scientific theories of sound? This would include voltage on preamp outputs, distortion, gain control knob on the amp. If so say yes and I will pose the question.

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[joshpoints 10+ year member]

What causes excesive subwoofer heat, besides overpowering a sub.

 

[Matador 10+ year member]

u can see that trying to be smart or kiss ass in here wont work:nono:

 

[mattj 5,000+ posts]

distortion overheats a sub insanely fast.

 

[ricerdude 10+ year member]

well inside the magnet there is a vioce coil and the sound waves from your amp go into the vioce coil and it moves up and down....i dont know how it makes sound...but when all of that power is being used and the vioce coil is moving there is a force or friction if you will..that caused heat...the subwoofers with the vented pole piece, which is the hole at the bottom of the magnet helps them cool better...the bazookas have a fluid injector you can buy that cool the sub...it like pumps coolant through the magnet..i am not sure how that works..no experience with bazooka...but orions fairfluid injected cools very well.....did i explain it well enough..

D

 

[ricerdude 10+ year member]

Originally posted by joshpoints What causes excesive subwoofer heat, besides overpowering a sub.

aho i didnt see the excissive part...well distortion does it..and maybee the wrong enclosure...

D

 

[Heresy 10+ year member]

Distortion, in itself, does not kill a sub. Overdriving an amp that then causes it to clip can produce enough power to kill a speaker but you can run a high power sub i.e. a DD9515 with a 500w amp that is fully clipping and it won't destroy the driver even with 24/7 use. There are a few (very long)threads on this topic, look them up on this forum or any other.

 

[Mark_ab 5,000+ posts]

Originally posted by joshpoints What causes excesive subwoofer heat, besides overpowering a sub.

Voice coil material, box size, cooling abilities of the driver, form of sine wave.

 

[joshpoints 10+ year member]

Originally posted by Matador u can see that trying to be smart or kiss ass in here wont work:nono:

Actually I wasn't trying to be smart. I figure it must take someone really smart to figure out my problem (they understand the science behind electronics and sound) because no one can seem to figure out exactly what my problem is.

 

[joshpoints 10+ year member]

Originally posted by Heresy Distortion, in itself, does not kill a sub. Overdriving an amp that then causes it to clip can produce enough power to kill a speaker but you can run a high power sub i.e. a DD9515 with a 500w amp that is fully clipping and it won't destroy the driver even with 24/7 use. There are a few (very long)threads on this topic, look them up on this forum or any other.

Here's my problem some say clipping doesn't cause damage, others say it does. Some say overpowering a speaker causes this damage others say it doesn't. My subs are two JBL Gt100's rated at 250 rms each. MY amp is a kenwood that I wired into an 8 ohm load. Each of these speakers was only getting 75 watts. Can lack of power cause damage to the tinsel lead, maybe through distortion? My gain is turned all the way off, and my sub preamp is 5.5 volts.

 

[Mark_ab 5,000+ posts]

Originally posted by joshpoints Here's my problem some say clipping doesn't cause damage, others say it does. Some say overpowering a speaker causes this damage others say it doesn't. My subs are two JBL Gt100's rated at 250 rms each. MY amp is a kenwood that I wired into an 8 ohm load. Each of these speakers was only getting 75 watts. Can lack of power cause damage to the tinsel lead, maybe through distortion? My gain is turned all the way off, and my sub preamp is 5.5 volts.

Clipping causes damage through restricting the mechanical limits of the driver, and through this adequate ventilation (read cooling) cannot occur. Overpowering a speaker causes damage through an excess of heat. Power ratings are simply thermal ratings, put into a way that everyone can recognize. Lack of power, assuming it's unclipped, will not hurt anything.

 

[joshpoints 10+ year member]

Originally posted by Mark_ab Clipping causes damage through restricting the mechanical limits of the driver, and through this adequate ventilation (read cooling) cannot occur. Overpowering a speaker causes damage through an excess of heat. Power ratings are simply thermal ratings, put into a way that everyone can recognize. Lack of power, assuming it's unclipped, will not hurt anything.

I have a theory of what might be happening, but if I'm way off just tell me. This is the only thing that I can think of. my amp puts out 300X1 at 4 ohms. I wired my speakers in series which causes an 8 ohm load. So each speaker is only getting 75 watts (recomended amount is 250rms). When I turn my volume up could this cause the amp to try and supply the subs with more than 75 watts at the 8 ohm load which it is not made to do, causing clipping?

 

[paikiah 5,000+ posts]

Originally posted by joshpoints I have a theory of what might be happening, but if I'm way off just tell me. This is the only thing that I can think of. my amp puts out 300X1 at 4 ohms. I wired my speakers in series which causes an 8 ohm load. So each speaker is only getting 75 watts (recomended amount is 250rms). When I turn my volume up could this cause the amp to try and supply the subs with more than 75 watts at the 8 ohm load which it is not made to do, causing clipping?

I've got dual 8ohm SVC subs... if I linked one to the amp in a bridged mode, it doesn't produce ANYTHING like it's supposed to do...if I linekd both, the sounds come out amazingly clean...

i guess amps aren't good with 8ohm resistance or something... you gotta lower your ohms and see what happens then...

 

[Mark_ab 5,000+ posts]

Originally posted by joshpoints I have a theory of what might be happening, but if I'm way off just tell me. This is the only thing that I can think of. my amp puts out 300X1 at 4 ohms. I wired my speakers in series which causes an 8 ohm load. So each speaker is only getting 75 watts (recomended amount is 250rms). When I turn my volume up could this cause the amp to try and supply the subs with more than 75 watts at the 8 ohm load which it is not made to do, causing clipping?

Your amplifier isn't alive, and it doesn't try to do anything that you don't tell it to. Just because the impedence is higher doesn't mean it's unhappy. The problem lays in the fact that you are simply expecting too much output from 150W RMS. To overcome this problem it appears you have your gain turned up too high. When you crank the volume, you send a clipped sine wave and you know what happens then. Turn the gain down so that no distortion occurs at maximum volume. Then you will have nothing to fear.

 

[ricerdude 10+ year member]

alright we answered the question...now where is my million dollars damit...//content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif

D

 

[joshpoints 10+ year member]

Originally posted by Mark_ab Your amplifier isn't alive, and it doesn't try to do anything that you don't tell it to. Just because the impedence is higher doesn't mean it's unhappy. The problem lays in the fact that you are simply expecting too much output from 150W RMS. To overcome this problem it appears you have your gain turned up too high. When you crank the volume, you send a clipped sine wave and you know what happens then. Turn the gain down so that no distortion occurs at maximum volume. Then you will have nothing to fear.

Here's the thing though. My gain was hardly turned on at all. It was turned like 1/12th on. When I turned it all the way off I noticed no difference with the sound. My deck has a subwoofer level control that controls how loud it plays. If I turn this up is it doing the same thing as raising the gain too high? Or is this like a regular volume control, but just adjusts the volume of the sub? I can use this control to turn my subs to 0 db or to max db's. What does distortion sound like in a sub, because I don't think that I'm hearing any distortion, some music that sounds like it is distorting is just from low quality downloaded music. THanks for your time and help.

 

[ASDF12345 10+ year member]

Originally posted by ricerdude well inside the magnet there is a vioce coil //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif and the sound waves from your amp go into the vioce coil and it moves up and down....i dont know how it makes sound...

 

D

it doesnt make sound. your ears make sound. try to understand that sound is just differences in air pressure (SPL., sound pressure level.) those little movements of the sub back and forth create differences in air pressure ad your ears hear that as sound.

 

[joshpoints 10+ year member]

Originally posted by Grand AMature it doesnt make sound. your ears make sound. try to understand that sound is just differences in air pressure (SPL., sound pressure level.) those little movements of the sub back and forth create differences in air pressure ad your ears hear that as sound.

essentially this means the same thing. Sound is just waves that form from almost anything, tapping a glass, stomping the floor etc. we just call it sound, but it's all the same thing. Like rain is sometimes called precipitation.

 

[paikiah 5,000+ posts]

and sweat is called perspiration....

your ears do not make sounds... the inner ear might...//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif your earlobes don't make noise, unless you're dumbo and can flap 'em... your drums simplay vibrate according to the waves it receives...I ain't no doctor, and it's been awhile since I've left school so I'll stop here for someone else to pick up the rest...

 

[joshpoints 10+ year member]

Originally posted by paikiah and sweat is called perspiration....

 

 

your ears do not make sounds... the inner ear might...//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif your earlobes don't make noise, unless you're dumbo and can flap 'em... your drums simplay vibrate according to the waves it receives...I ain't no doctor, and it's been awhile since I've left school so I'll stop here for someone else to pick up the rest...

Actually there have been and probably still are philosophers that brought pretty strong arguments about people and existence. These philosophers believed that there was no external world. All images we see come from the mind. These images come from god. In fact there may be only one person that exists. All the people we see enter our brain from god, but they may not be real people. It gets pretty deep. If you are slightly looney, or a little off I recomend that you do not take philosophy, seriously it may be dangerous to your health. After what I've heard in class I'm surpised people haven't tried jumping off buildings, gone on shooting sprees, or committed suicide. Maybe the guy that you are talking about is a deep philosophers. What you learn in philosophy is how our whole life is based off assumptions. Example: What is gravity? It a force, it's not know whether this force is pushing down or pulling down. But this is all we know. We don't know where it comes from and we can't prevent it from existing on earth. Maybe I'll open a thread on philosophy.

Anyways we're off track we still have not found the answer to my problem. It's not gain it's not overpowering. COuld it be underpowering the sub with the 8 ohm wiring set-up causing the amp to try and draw more than the possible 75 watts per channel that it can make at 8 ohms and then causing clipping. Please let me know.