I recently got an Alpine
SWR-1221D (300 rms). I have a sealed box that's 1.57 ft^3, and a Pioneer amp that'll give it 250 rms.
I was looking at just taking the sealed box I have since I took a while to build it to fit perfectly in my pickup, and just porting it, and using the Type R in it.
Looking at the specs, it shows ported volumes should range between 0.75-1.75 cubic feet. Ideally, I'd make it as big as they recommend making it. But it would be a pain to remake the box since I won't have this truck for a whole lot longer.
So, my questions are:
Is there any reason I shouldn't just use this box?
If not, what should I tune the port to, and is there an advantage to putting two ports instead of just one?
Also, will there be any downside to having the ports on the side of the box instead of on the front?
Is there any reason I shouldn't just use this box?
No.
You won't need more than one port. Two ports are used if the power is too great for the size opeining of one port (port noise), but you must realize that the larger the port opening the longer the port length. Port displacement will take away from box volume. If the box is in the trunk, you should not hear any difference in sound with the port opeining on the side.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
The sub's behind the passenger seat of my Tacoma. So the port would be facing my seat.