Robin Smith
Stunt Coordinator
- Joined
- Sep 27, 2000
- Messages
- 184
So, at long last I am finally embarking on my sonotube subwoofer project and am having difficulty with some (most)of the calculations.
Problem #1:
What is the volume displacement of the Dayton DVC 15" (295-190) driver?
Problem #2:
How do I account for the volume of the portion of the driver that will actually be "in" the tube? I am flush mounting it to 1.5" of MDF, only 0.85-0.90" of which is "inside" the tube. Surely this means that not all of the volume of the driver is considered to be inside the tube and thus I should only account for a portion of the driver's volume.
Problem #3:
I am having difficulty understanding which numbers to enter first to determine the length of my sonotube cut.
I am using 20" sonotube, which has an actual inside diameter of 20 1/16" and I plan on using a 4" flared port (unless someone recommends otherwise).
How do you decide the tuning for your sub? Why tune to 18Hz instead of 20Hz, etc? I will be running the sub with the MCM 250W plate amp. How do you then use this tuning frequency to get the volume?
Problem #4:
I played with LspCAD using the Tempest (whose numbers seem close to the DVC 15") and got mighty lost. It seems to want me to enter the desired volume first, but isn't this what I am trying to determine? Plus, I didn't have all the numbers it needs to give me the answers.
Ultimately I would like to know:
What is the "ideal" tuning (and why)?
What is the desired internal volume and port size/length I need for achieving this?
How to use all these numbers (with the volumes of each item) to determine the cut length of my 20 1/16" sonotube.
In other words I need to pretty much be told everything.
I did a search through some previous posts and checked out Patrick Sun's web site (among others) but didn't really find the more basic info I am seeking.
Thanks in advance
Robin Smith
Problem #1:
What is the volume displacement of the Dayton DVC 15" (295-190) driver?
Problem #2:
How do I account for the volume of the portion of the driver that will actually be "in" the tube? I am flush mounting it to 1.5" of MDF, only 0.85-0.90" of which is "inside" the tube. Surely this means that not all of the volume of the driver is considered to be inside the tube and thus I should only account for a portion of the driver's volume.
Problem #3:
I am having difficulty understanding which numbers to enter first to determine the length of my sonotube cut.
I am using 20" sonotube, which has an actual inside diameter of 20 1/16" and I plan on using a 4" flared port (unless someone recommends otherwise).
How do you decide the tuning for your sub? Why tune to 18Hz instead of 20Hz, etc? I will be running the sub with the MCM 250W plate amp. How do you then use this tuning frequency to get the volume?
Problem #4:
I played with LspCAD using the Tempest (whose numbers seem close to the DVC 15") and got mighty lost. It seems to want me to enter the desired volume first, but isn't this what I am trying to determine? Plus, I didn't have all the numbers it needs to give me the answers.
Ultimately I would like to know:
What is the "ideal" tuning (and why)?
What is the desired internal volume and port size/length I need for achieving this?
How to use all these numbers (with the volumes of each item) to determine the cut length of my 20 1/16" sonotube.
In other words I need to pretty much be told everything.
I did a search through some previous posts and checked out Patrick Sun's web site (among others) but didn't really find the more basic info I am seeking.
Thanks in advance
Robin Smith