Posted February 22, 200817 yr Hey, wuts up. I've got a 12" Bl in a box that is 2.4 before displacement. Right now it is tuned to 30 hz, and I absolutely love it. However, would something like a 35hz or 38hz tune have a higher output for competition? I'm running about 800 watts to the sub right now.
February 22, 200817 yr There are a lot of different variables at work in SPL cars. Usually competitors build their boxes more than once to achieve a higher score each time.It might be louder at 38hz, it might not. It also might be louder to your ear and more quiet to the mic.You'll have to play with it to get it to a perfect point. You might consider an interchangeable port plug.
February 22, 200817 yr Author I'm running a 3" aero port, so I can play around with the port as much as I want.
February 22, 200817 yr Author I know but that is the biggest I could fit. I have this behind the seats in a regular cab dodge. This system is still very loud though and will vibrate the seats of a car 2 cars ahead of me. I wish I could have gone with bigger port. How would it sound if I kept the 3" port and put a 2" right above it on the same side?
February 22, 200817 yr I know but that is the biggest I could fit. I have this behind the seats in a regular cab dodge. This system is still very loud though and will vibrate the seats of a car 2 cars ahead of me. I wish I could have gone with bigger port. How would it sound if I kept the 3" port and put a 2" right above it on the same side?two different size ports? meh! if you're going to do two keep them the same size. if you are having trouble with the size of the port have you considered a PR? lots of options for tuning and smaller box ( due to no port ).
February 22, 200817 yr Nothing wrong with two different size ports. . .You will have to just add the second port and actually test the system to determine the best tuning for maximum output. As already stated, they only way to achieve your best seup is testing, testing, and more testing. Add the second port as long as it can be, test it, cut an inch off, test it, cut an inch off, test it, etc. Figure out the best combination for maximum output with the space you are limited to. It takes time. If you find the second port adds more output on the meter, you can plug it for daily and open it when you want to meter. A lot of people do that with slot ports. Build an insert for daily tuning, remove the insert for metering.When I built my suburban the first time, I spent several days testing port lengths/tuning frequency to obtain maximum output with the space I was willing to give up for the enclosure.Brian
