- Jan 22, 2004
I am building a subwoofer box for my vw jetta. I will be putting 3 Alpine Type R subwoofers in it powered by the 1000W Alpine mrdm1000 amp. I calculated the internal box volume to be about 3.5ft2. I would like to use slot ports. My questions are how many ports should I use, and what frequency should I tune the ports to? Thanks!