weird issue with sub

Originally Posted by Mister House

Amp has a peak output and you are hearing that.... once the amp is playing at normal mode the nominal power of the amp is represented. Simple terms... amp peaks at turn on and levels out after that.

Originally Posted by saprano

Thanks for that explanation MS, that makes perfect sense. I never knew a heated voice coil can cause that. Thank you also for putting away my worries that my sub is broken. .....I do plan on getting a F113 this year so maby i dont have to worry about this heated coil as much.

The tone deafness is what i also thought i was experiencing.

Originally Posted by ARK1

Blue thanks for your input. In my case my receiver always starts at -50db when first turns on (thats how I have the setting for the receiver). So when the trailer started the first time and sub turned on, it was @ -50db and I felt the incredible bass and the ground shook. After that initial play, the subsequent plays didn't feel that pronounced as the first one even when I bumped up the volumer on receiver to -35db. I am guessing that if I turn up the gain on my sub and the receiver I should be able to get that output from the sub since I know now for sure that it is capable of shaking my floor .

Originally Posted by bluesky636

Mister House's "explanations" are, to be polite, bull.

Statements such as an "amp peaks at turn on and levels out after that" is false. When an amp is turned on, sub or otherwise, if a signal is being fed to it at the time, the amp will output a signal that is in direct relationship to the input. Nothing more nothing less. And to believe that there is "no way to get the peak power after it has turned on" is bull. The amp or sub can be easily driven (and even over driven) to full power by the appropriate input signal. There is nothing magic about all this.

ARK1, when your sub turned on while watching District 9, you just happened to have it occur at a peak signal level. Yes, it sounded overly loud because you went from no sub output to a high output. The reason you did not experience the same affect when you watched it from the beginning (with the sub already turned on) was because you were already hearing output from the sub that masked the sudden transition to max output. During the course of the movie, your sub was outputting what the audio signal called for. If you had the volume turned up enough and the audio signal was high enough, you could certainly drive the sub to peak output at anytime.

Saprano, if you think your voice coils are "overheating" and you think that you are hearing a decrease in bass output, either you are overdriving your sub to begin with or you have a poorly designed sub. What you are probably experiencing is audio compression. Once you reach a certain loudness level, the input to output relationship is no longer reasonably linear in a speaker. At normal listening levels, a 1 dB change in input to the speaker will result in a 1 dB change in output. At a certain level the speaker will start to compress the sound. It may than take a 3 dB change in input level to result in a 1 dB change in output level. By that point you have probably reached the ears limits and you may not even be able to hear the resulting change in output level. Turn the level down and the compression goes away. Under reasonably high levels, a sub's output does not decrease from the beginning of a movie to the end.

Regarding "tone deafness" here is an explanation:

http://en.wikipedia.org/wiki/Tone_deafness

I cannot believe some of the stuff people post in these forums.

Originally Posted by Steve_M

Sometimes I wonder where people get things like that...

Originally Posted by Mister House

So glad I could be of help in this forum. I will take my "bull" somewhere else.

Originally Posted by bluesky636

Mister House's "explanations" are, to be polite, bull.

Statements such as an "amp peaks at turn on and levels out after that" is false. When an amp is turned on, sub or otherwise, if a signal is being fed to it at the time, the amp will output a signal that is in direct relationship to the input. Nothing more nothing less. And to believe that there is "no way to get the peak power after it has turned on" is bull. The amp or sub can be easily driven (and even over driven) to full power by the appropriate input signal. There is nothing magic about all this.

ARK1, when your sub turned on while watching District 9, you just happened to have it occur at a peak signal level. Yes, it sounded overly loud because you went from no sub output to a high output. The reason you did not experience the same affect when you watched it from the beginning (with the sub already turned on) was because you were already hearing output from the sub that masked the sudden transition to max output. During the course of the movie, your sub was outputting what the audio signal called for. If you had the volume turned up enough and the audio signal was high enough, you could certainly drive the sub to peak output at anytime.

Saprano, if you think your voice coils are "overheating" and you think that you are hearing a decrease in bass output, either you are overdriving your sub to begin with or you have a poorly designed sub. What you are probably experiencing is audio compression. Once you reach a certain loudness level, the input to output relationship is no longer reasonably linear in a speaker. At normal listening levels, a 1 dB change in input to the speaker will result in a 1 dB change in output. At a certain level the speaker will start to compress the sound. It may than take a 3 dB change in input level to result in a 1 dB change in output level. By that point you have probably reached the ears limits and you may not even be able to hear the resulting change in output level. Turn the level down and the compression goes away. Under reasonably high levels, a sub's output does not decrease from the beginning of a movie to the end.

Regarding "tone deafness" here is an explanation:

http://en.wikipedia.org/wiki/Tone_deafness

I cannot believe some of the stuff people post in these forums.

Originally Posted by saprano

So how do we know your telling the truth? ....Heh, if what you say is correct then i feel like an idiot. I need to do my own research and not believe everything i read. But this is AVS right?

Anyway. Yes i really do feel im experiencing less output than before. Like i said, it started after i watched WOTW (this was months ago). I was playing the pod scene, just like i did with TS, and i immediately felt less output around the 4th time i played it. I thought i broke something but when i sent in it to get it looked at they found nothing wrong.

Ever since then i've watched movies and the bass sounds really good but im always thinking im not getting the same output as i use to ever since that happened with WOTW.

Originally Posted by saprano

Everything is setup fine.

Im not saying the output gets lower overtime, i think my subs output is lower overall.

But its probably just me.

Originally Posted by saprano


Anyway. Yes i really do feel im experiencing less output than before. Like i said, it started after i watched WOTW (this was months ago). I was playing the pod scene, just like i did with TS, and i immediately felt less output around the 4th time i played it. I thought i broke something but when i sent in it to get it looked at they found nothing wrong.

Ever since then i've watched movies and the bass sounds really good but im always thinking im not getting the same output as i use to ever since that happened with WOTW.