foam?
11-24-2006, 08:29 AM
#12
Originally Posted by Haunz
it should not be a fetch to understand that harmonics caused by distortion can stand inside a box.......
You need to back up your statement with some sort of logical path, including numbers, theory etc. At least then we can debate it and add to it. But simply making a statement out of nowhere with no mention of how you came to that conclusion is not very helpfull.
I spent 10 minutes searching the web for some answers and I found some. I unfortunately also found some speaker company web sites that where full of garbage! I am not saying that you are wrong, just give us a bit more info please!
For example, a constructive discussion would go something like this:
Haunz:A+B+C=D and I think D is lound enough to hear
Zoomer: I can agree with your calculations but in my opinion D is not audible
or:
A+B+C=D but you forgot the factor -F. It shoud be A+B+C-F=D and then D is unaudible
Haunz: Oh, I forgot about F, thank you for bringing that up. In that case we both agree.
or
Haunz: I new about F but I found some research that claims that F is not as big a factor as most people think. here is the link...
Zoomer:.Ah! I see! Yes that is quite plausible. My appologies, I now agree with you. Job well done!
This sort of discussion is much more interesting that a Yes it is... No its NOT, YES it is you are an jerk...NO ITS NOT you MORON. That's what kids yell at each other in the school yard!
Get it?
Last edited by zoomer; 11-24-2006 at 08:41 AM.
11-24-2006, 10:32 AM
#14
50 Watt CAFz'r
Join Date: Oct 2006
Posts: 54
Best to check the T/S parameters of your sub. If the reccommended volume is already .5 cubes, then you shouldn't really need to stuff the box to achieve good resonance. Although opinions differ slightly, it's believed you can make up 20-25% volume by stuffing with poly.
11-24-2006, 10:41 AM
#15
Originally Posted by Audiophile72
Best to check the T/S parameters of your sub. If the reccommended volume is already .5 cubes, then you shouldn't really need to stuff the box to achieve good resonance. Although opinions differ slightly, it's believed you can make up 20-25% volume by stuffing with poly.
11-24-2006, 01:06 PM
#17
Zoomer.... you want to see the results get a test mic/preamp and the appropriate FREE computer program and take some thd graphs with and without fill for yourself....
first of all I said it can and will help kill distortion... it might give an audible difference or it might not..... (obviously if there is no appreciable amount distortion in the system to begin with its not going to make a difference)
But it should be clear that there will be a host of distortion products over 163Hz that can reflect or stand inside a 1'x1'x1' box...
I hope you do realize that fiberfill or whatever acts to lower Q by attenuating low frequency energy inside the box; And provided you understand that it should not be difficult to understand that the attenuation at higher frequencies will be even greater.
In other posts we are talking about running amplifiers at 20% THD and a typical speaker will already produce 3-5% (-or even more from a sub-) on its own... add in breakup modes and we know that distortion is a real world factor in almost every instance......
STANDING MODES INSIDE THE BOX CAN AND WILL AND DO REINFORCE THEIR CORRESPONDING DISTORTION PRODUCTS
I hope that is a good enough explination for you
first of all I said it can and will help kill distortion... it might give an audible difference or it might not..... (obviously if there is no appreciable amount distortion in the system to begin with its not going to make a difference)
But it should be clear that there will be a host of distortion products over 163Hz that can reflect or stand inside a 1'x1'x1' box...
I hope you do realize that fiberfill or whatever acts to lower Q by attenuating low frequency energy inside the box; And provided you understand that it should not be difficult to understand that the attenuation at higher frequencies will be even greater.
In other posts we are talking about running amplifiers at 20% THD and a typical speaker will already produce 3-5% (-or even more from a sub-) on its own... add in breakup modes and we know that distortion is a real world factor in almost every instance......
STANDING MODES INSIDE THE BOX CAN AND WILL AND DO REINFORCE THEIR CORRESPONDING DISTORTION PRODUCTS
I hope that is a good enough explination for you
Last edited by Haunz; 11-30-2006 at 04:15 PM.
11-24-2006, 09:48 PM
#18
50 Watt CAFz'r
Join Date: Oct 2006
Posts: 54
True enuf Belcom, but I was more just using .5 in general. I think you're right tho in that in a lot of cases they "recommend" a range of acceptable volumes that your sub will work with, but maybe not to full potential. That was more my point in that if you want to get to the nitty gritty you need to address the T/S and get more specific with your volume. Your manufacturer may suggest a box volume between (for example) 0.5 to 1.2 cubes, but you don't know the actual "sweet spot" until you bring things to formula.
Last edited by Audiophile72; 11-24-2006 at 09:50 PM.
11-25-2006, 10:27 AM
#20
Originally Posted by Haunz
Zoomer.... you want to see the results get a test mic/preamp and the appropriate FREE computer program and take some thd graphs with and without fill for yourself....
first of all I said it can and will help kill distortion... it might give an audible difference or it might not..... (obviously if there is no appreciable amount distortion in the system to begin with its not going to make a difference)
But it should be clear that there will be a host of distortion products over 163Hz that can stand inside a 1'x1'x1' box...
I hope you do realize that fiberfill or whatever acts to lower Q by attenuating low frequency energy inside the box; And provided you understand that it should not be difficult to understand that the attenuation at higher frequencies will be even greater.
In other posts we are talking about running amplifiers at 20% THD and a typical speaker will already produce 3-5% (-or even more from a sub-) on its own... add in breakup modes and we know that distortion is a real world factor in almost every instance......
STANDING MODES INSIDE THE BOX CAN AND WILL AND DO REINFORCE THEIR CORRESPONDING DISTORTION PRODUCTS
I hope that is a good enough explination for you
first of all I said it can and will help kill distortion... it might give an audible difference or it might not..... (obviously if there is no appreciable amount distortion in the system to begin with its not going to make a difference)
But it should be clear that there will be a host of distortion products over 163Hz that can stand inside a 1'x1'x1' box...
I hope you do realize that fiberfill or whatever acts to lower Q by attenuating low frequency energy inside the box; And provided you understand that it should not be difficult to understand that the attenuation at higher frequencies will be even greater.
In other posts we are talking about running amplifiers at 20% THD and a typical speaker will already produce 3-5% (-or even more from a sub-) on its own... add in breakup modes and we know that distortion is a real world factor in almost every instance......
STANDING MODES INSIDE THE BOX CAN AND WILL AND DO REINFORCE THEIR CORRESPONDING DISTORTION PRODUCTS
I hope that is a good enough explination for you
I think we can be friends!
