I have two crossfire db312d and I built the ported box recommended by crossfire. Only problem is it is tuned to 31 hz. The speakers are rated to 20 hz, I don't feel comfortable with redesigning a new box from scratch that will accomplish this goal. My goal is 23 hz, if that wont damage it. So the box is 2.3 cuft, it has a 4" diameter and is 12 inches long. according to the the12volt.com port length calculator I either have to go longer or drop the diameter. If I keep the box as is at 2.3 cuft, can I just cut the 4" pipe flush to the box and then make a piece of wood with a two inch by five inch port and just attach it over the old hole and caulk it to hell?
Would that work? I dont have any hang ups with appearance so Does anybody think that this possible, and if not please give me suggestions.
I would keep it tuned to 31hz if thats what crossfire suggests. I'm not an expert but I think it says 20hz as a low end cutoff for your sub. tuning a box to 23hz is way too low for car audio
I am by no means a car audio expert, so please explain why 28- 30 is most desirable. I was under the impression that Earthquake (magmas) are capable of going down to 11 or 15 I am not sure. Could I reach lower frequencies with a large sealed box?
I know that from the research I did when first deciding on what box to use, that ported go lower and have a +3 db sound when compared to sealed at same wattage. Only problem with ported is that they distort past their tuning frequency. Many songs reach into the 20s. I know that they dont create the most db but the pressure is tremendous. That is why I want to recreate that with the Crossfires.
So please I dont believe in too much info, feel free to drop some knowledge on me. I am very curious.
11-15hz is right at the human threshold of hearing response. With all the other frequencies playing it's just not practical to tune a box that low. Not to mention the # of songs that even have that frequency in it.
I think that you are misunderstanding me. I have no intentions of going to 15hz, I just am wondering can I tune it to 25hz. Would the sound quality be compromised? Would it give it a larger field of sound or would it take from its ability to play 60 - 80 hz. Would it blow the speakers because the cubic feet for the box is too much for the frequency. Please understand I am not just asking whether or not I should I am asking many questions because it is something that I have started to think seriously about. And I get the picture about leaving it at 31, crossfire tested it and found that to be optimal. I am just curious as to how much it can be tweaked.
The lower the frequency, the less output you get at that frequency. If crossfire recommends 31 hz for that sub, it's a safe bet that they did so b/c it does not produce decent output below that.