Audio Systems: ohms and boxes, pvc plumbing pipe, dual voice coil

Question
first i was wondering about ohms and watts.  if i have a 1000 watt mono amp and its rated at 1000 watts @2ohms  and i get two 2ohm subs and wire them together to make them 2ohms, how many watts is each speaker getting?
next, i am planning on making a ported box for a kicker s12L7 to go in my 93 civic hatchback.  the speaker needs 1.75-3.25 cu ft.  how would i go about making a ported box for it.  is it just a box with holes cut out?  do the size of the ports matter?  can you give me a general description of the materials needed and dimensions to build this box

thank you for your time.
chris

Answer
I presume these are Dual Voice Coil because you cannot wire a pair of 2 Ohm drivers up as a 2 Ohm load if they are not.


Chris,

Operational load is 1000 Watts at 2 Ohms:
1000 divided by two is always 500 (watts), so each speaker receives 500 watts.


*I would not port it if you have the room for the correct sized sealed enclosure.

I reccommend this for four reasons.
1) Speaker longevity (porting requires an additional component - a 12db/oct Subsonic filter (minimum) [24db/oct reccommended]).
2) A sealed enclosure will have much better low bass performance (below the 'tuning point' of the box).
3) The box is much easy to 'align' to the speaker in a sealed design.
4) You have no experience with designing ported designs.

Sealed size per driver = 2.0 cu.ft. Power Handling = 750W
Use 3/4" high density particle board.



Porting a cabinet is much, MUCH more than simply cutting a hole in a box (or even putting a tube into a hole you cut out).
This is against my better judgement, since Quality is always better than quanitity... But in the spirit of learning (and since you have chosen SPL type speakers):

Ported box parameters for SPL:
Volume:  3.25 cu.ft. per driver
Port size:  one 3" diameter x 13.75” length per driver

Use 3/4" high density particle board.
Use PVC plumbing pipe for the ports.
The internal end of the port should not be within 1/2 the diameter of the port to any internal surface (in this case and 1 1/2"). So do not place it to close to a corner.

More specifics and tips for internal bracing are available at www.kicker.com.


Sincerely,
Jerry Mael