Opposing drivers

[johndonahoe]

What happens if I use 2 subwoofer drivers in 1 cabinet? I'm using 2 Titanic grade 12" drivers. 2.0 or 3.0 cabinet? Opposing drivers or 90 degrees mounting? Sealed passive cabinet, Dayton sub amp. Not much space, would two 2.0 cabinets stacked sound better? Thanks.

[Scott L]

> What happens if I use 2 subwoofer drivers in
> 1 cabinet? -- You will have to provide enough "air volume" for two drivers.

> I'm using 2 Titanic grade
> 12" drivers. 2.0 or 3.0 cabinet?

4.3
> Opposing drivers or 90 degrees mounting?

Opposing, if you can.
> Sealed passive cabinet, Dayton sub amp. Not
> much space, would two 2.0 cabinets stacked
> sound better? Thanks.

It sure would be easier.

[unknownuser]

In my opinion, all drivers need their own room. When you put different drivers in the same room, they argue with each other over the use of the space, and what you get is coloration through the front of the speaker or elsewhere.

Growing up as a child I would have been much less colored if I'd had my own living space and speakers are no different.

> 4.3

> Opposing, if you can.

> It sure would be easier.



(Originally posted by: Lumpy)

[philiparcario]

> In my opinion, all drivers need their own
> room. When you put different drivers in the
> same room, they argue with each other over
> the use of the space, and what you get is
> coloration through the front of the speaker
> or elsewhere.

> Growing up as a child I would have been much
> less colored if I'd had my own living space
> and speakers are no different.
use two boxes, it also gives you a chance to try this see link

<A HREF="http://s237.photobucket.com/albums/f...ipma1957/subs/">http://s237.photobucket.com/albums/f...ipma1957/subs/</A>

that is a pair of nht1259's in 3 cu ft cabs with MTMs above. you can set up your Titaniac's that way. Also the boxes can be moved 1 box with 2 drivers would be very heavy!!

[toddshore]

> What happens if I use 2 subwoofer drivers in
> 1 cabinet? I'm using 2 Titanic grade
> 12" drivers. 2.0 or 3.0 cabinet?
> Opposing drivers or 90 degrees mounting?
> Sealed passive cabinet, Dayton sub amp. Not
> much space, would two 2.0 cabinets stacked
> sound better? Thanks.

If they are opposing and wired out of phase then you'll only need 1/2 the volume - isobaric.

[Wolf]

> If they are opposing and wired out of phase
> then you'll only need 1/2 the volume -
> isobaric.

Opposed means firing in directions 180 degrees from the other, not clamshell.
Later,
Wolf

[toddshore]

> Opposed means firing in directions 180
> degrees from the other, not clamshell.
> Later,
> Wolf

What is your point? Two drivers firing 180 degrees from each other, wired out of phase, are isobaric.

[johndonahoe]

Thanks guys, excellent ideas. These are extra parts, for better or worse it will be interesting.

[Scott L]

> What is your point? Two drivers firing 180
> degrees from each other, wired out of phase,
> are isobaric.
.................................................
His point is [that] your point is inconclusive.
The original poster will not understand what you are trying to say without a MUCH further explanation. A Clamshell approach or an extra baffle board is required for an isobarick, otherwise it's a dipole. What I was describing was a bipole operation. Sorry wolf, I do not mean to speak for you. Also, a reaction cancell needs to have the magnet structures physically coupled. Even this here short explanation falls short.

[Wolf]

>
> .................................................
> His point is [that] your point is
> inconclusive.

Just because you have 2 drivers opposing each other and in reverse polarity, does not mean they are arranged in a certain fashion. They could be on teh same board, face to face, or on "opposite-sides" of the enclosure, as he is intending.

FWIW, Dipole can be IB, but both sides need to emanate into the same room. Dipole can also be 2 drivers in the same cabinet, opposed, with reverse polarity (same orientation with regard to enclosure), and *separate volumes*. If you don't separate them, you will have twice the drive on the outward moving driver, and essentially be placing it in a free-air environment. You also have to be aware of cancellation in this type of sub. (If you run them both pushing outward, and in the same orientation regard to the cabinet, or same polarity, then the volume can be shared by the drivers.)
Later,
Wolf

PS- You knew what I meant, no harm done.