decisions decisions....

i am now completely certain that i am getting a audiobahn a8000t amplifier. at 2ohms it will be running at 800 watts and at 4ohms 400watts. in order to get 800 watts to two subwoofers, would i have to get 2 subs with 2ohm load, 2 subs with a 4ohm load, 2 subs with dual 2ohm voice coils, or 2 subs with dual 4ohm voice coils? and also how would i get 400 watts at 4 ohms(same questions)? wow thats alot of questions gimmy feedback. thanx.

charmm

To run the amp at 2ohm, you would simply need the final impedence of the sub setup to be 2ohm. You can do this with 2 SVC 4ohm subs, or 2 DVC 2ohm subs.

To run the amp at 4ohm it's the same deal, but you would need 2 SVC 2ohm subs, or 2 DVC 4ohm subs.

Thats really interesting. so if i get 2 dvc 4ohm subs the amp will give both of my subs 400watts.
is this enough for the alpine type s im looking at that is 300w rms 900w max dvc 4ohm? or should i get the same type s with 300w rms 900w max dvc 2ohm giving both my subs 800watts?

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charmm

You sir are confused...

When you get 2 dvc 2ohm subs, you will wire them in series parallel yielding a 2 ohm load, which splits to each sub giving them an equal division of the watts, so 400 to each sub. When you wire it with 2 dvc 4ohm subs, you get a final load of 4ohms yiedling 200 watts to each speaker. Get DVC 2ohm subs.

okay that makes more sense now haha. i am also making my own box and it has .9 cubic feet of space per side. how could i add a port to this box, or do i have too little room.

thanx
Charmm

Let me look into that for you...

What size sub(s) and how many? What type also?

Well, right now im getting 2 12" subs (Alpine Type-S DVC 2ohm like you suggested) and im building a box at the moment. The box is going to be...

Height - 13.5"
Length - 35"
Bottom Depth - 14"
Top Depth - 7"

The side will look something like....

............._______
.........../...........|
........./.............|
......./...............|
...../__________.|

(Ignore the periods hahahah)

The Subs will be on the flat part.
I figured out the inside cubic feet with 3/4" MDF to be ~.91 Cubic Feet for each side of the sub because it will be divided into 2 parts.

the recommended cubic feet for a sealed box is .85 to 1.5 Cubic Feet
The recommended for a Ported box is 1.24 2.0 cubic feet

this is all the space that i have to spare but i was wondereng if there were tricks to make it bigger. (I heard of poly fill but i dont know anything about it or how it would affect my box size or where to get it)

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Charmm

since your box is too small for a port, you should get a passive radiator. that's basically a speaker without a motor assembly. so what you'll appear to have is 4 subs, but only two of them will be active and the other two works off of the pressure of the energized subs. tuning them is just a matter of adding weights.

where could i get something like that? and also could i just put it on the top of the box? how big dose it have to be?

im interested in this passive radiator

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Charmm

I wouldn't go with a passive radiator, but you can get one at adireaudio.com

what would you suggest then? just keep it in a sealed enclosure?

I would keep it sealed. Passive radiators are not very accurate

2.632 total cubic feet

1 Top, 1 Bottom: 11.74 (c) x 18.07 (b) in
0.75 (thick) in
1 Front, 1 Back: 26.81 (a) x 16.57 (d) in
0.75 (thick) in
2 Sides: 26.81 (a) x 11.74 (c) x 0.75 (thick) in