Graphing box rise

[JG903 10+ year member]

I have read around and was always interested in box rise and what mine was. Well today I did some testing on my current setup and I am not sure what to make of it. I went to excel and graphed the points and this is what I got.

Is this what it is supposed to look like? Did I do it right? If I am reading it right my Orion is putting out less than 1000 rms at 39 Hz:crying: .

Click to read more...

 

[germanyt 10+ year member]

How does that work anyway? I don't understand how the impedence that the amplifier sees is affected by the box. Also, is this just acoustic theory or fact of life?

 

[JG903 10+ year member]

I really do not understand it as much as others but the fact is that it does change. due to frequency and heat.

 

[Immacomputer 10+ year member]

How does that work anyway? I don't understand how the impedence that the amplifier sees is affected by the box. Also, is this just acoustic theory or fact of life?

Impedance varies over frequencies in a circuit. When you put a sub in an enclosure, both the sub and the enclosure are a part of the circuit. The enclosure will have a huge effect on the impedance of the system.

 

[Death By Bass 10+ year member]

guess your enclosure is tuned to like 40Hz then //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[kicker06 10+ year member]

So the flatter the response curve, the less imp rise?

 

[acold7dusta 10+ year member]

So the flatter the response curve, the less imp rise?

referring to the imp curve, yes.

OP: how did you figure out the points to plot on excel?

 

[JG903 10+ year member]

OP: how did you figure out the points to plot on excel?

I went to my truck and took out my DMM and a test tone cd. I took the AC Voltage and the current from 25-50 hz. It took me a little while. I wrote it all down and calculated the resistance. I then went to excel and created a chart.

 

[Chevyaudio 5,000+ posts]

You need a clamp meter to measure Impedance rise...I assume you used one?

 

[JG903 10+ year member]

You need a clamp meter to measure Impedance rise...I assume you used one?

I was under the impression that you could use two DMM at the same time to get the same results. One wired to get current and the other to read the voltage. At least that is what I think I read over at termpro. Oh and using a clamp would be way easier but I do not own one. Do you know where I could get one cheap?

 

[danteBirosel 5,000+ posts]

I was under the impression that you could use two DMM at the same time to get the same results. One wired to get current and the other to read the voltage. At least that is what I think I read over at termpro. Oh and using a clamp would be way easier but I do not own one. Do you know where I could get one cheap?

I'm quite interested to know where you got this information from. Care to share the link?

You can get a clamp meter anywhere. What you want to get is a Digital Clamp Meter. Can buy one at harbor freight, ebay, or a local hardware store. Just make sure u get a name brand quality clamp meter. I hear stories about how clamps tend to not work, and it was due to how cheap they went with it.

-Dante

 

[JG903 10+ year member]

I'm quite interested to know where you got this information from. Care to share the link?


You can get a clamp meter anywhere. What you want to get is a Digital Clamp Meter. Can buy one at harbor freight, ebay, or a local hardware store. Just make sure u get a name brand quality clamp meter. I hear stories about how clamps tend to not work, and it was due to how cheap they went with it.

-Dante

I think I found the link for you. Scroll down and look at the post by Alaska.

http://audioforum.termpro.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=8;t=007363

 

[luvinthebass 5,000+ posts]

I have read around and was always interested in box rise and what mine was. Well today I did some testing on my current setup and I am not sure what to make of it. I went to excel and graphed the points and this is what I got.

Is this what it is supposed to look like? Did I do it right? If I am reading it right my Orion is putting out less than 1000 rms at 39 Hz:crying: .

that's a good graph dude