mechatron

Hi Guys,

I'm just about to get a subwoofer box built up for my SS Commodore sedan and I would love to get some advice from the very knowledgeable and experienced members on here. I currently have one 2012 12" Type R sub (SWR-12D4 1000w rms) in the prefabricated Alpine box (SBR-S12D4 => ie the one with the long horizontal slotted port) and it is powered by an Alpine PDX-M12 amplifier. I now want to get a second 12" Type R sub (SWR-12D4 1000w rms) and get both installed in a custom ported enclosure. I will connect each coil per sub in series (4Ω+4Ω=8Ω) and then connect the two subs in parallel to achieve a total resistance of 4Ω.

With this new setup, I’m still planning to use the one PDX-M12 amp to power both 12" subs. From memory my PDX-M12 has a birth sheet of 1350w – 1400w rms and this power rated at both 2Ω and 4Ω, so I’m hoping that this will be adequate to power these two subs properly.
Now I was really hoping to find out what the best size ported box would be for these two 12” Type R subs. I have read quite a lot of information on forums and many people say that the Type Rs sound much better in a large ported enclosure (2.0 to 3.5 cubic feet per sub) …..but all the info I found was for the older 600w rms Type R subs. So, is this box size of 2.0 to 3.5 cubic feet per sub still recommended for the newer 1000w rms Type R subs (SWR-12D2 / SWR12-D4)? I’m really struggling to find information on the best ported box sizes for the newer Type R subs. Alpine recommends a ported box size of 1.7 cubic feet per sub, but this sounds too small based on what most people have used in the past for the older 600w rms Type R subs.

So to summarize, can members on here please tell me the following:
- Best box size (cubic feet per sub)
- Best port size and the number of ports required
- Whether I should have a MDF divider between the two subs inside the enclosure (i.e. just like having two individual boxes mounted together) or should both subs share the same air space?
- Best frequency to tune the ported box to, if I like a variety of music (50cent, Pearl Jam, Bliss N Eso, Evanescence etc)…I’m thinking 35-38Hz.

Also the space I have available is 0.36m x 0.38m x 1m or 14.2in x 15in x 39.4in

Thank you so much in advance guys.