Woofer arrangement

[Manetic09 0]

This would be my first post onto this forum but to start it off i'd like some opinions.

I had belief in a theory that if your woofers faced each other you could then perhaps feed them more power and essentially they would just load off of each other. Now technically speaking how do you guys think this would work? Keep in mind they are both (2) in phase with one another in separate boxes.

[///M5 2,833]

No. Don't use the word load. Will they interfere with each other? You bet. Is that a good thing? Not really.

[Manetic09 0]

Alright that's great to hear so far because i was a little skeptical on that. When i heard it i thought no, you wouldn't benefit from anything but then you think of the sound waves being emitted pushing against each other so could it actually dampen the sound??

[///M5 2,833]

Go fill up your bathtub. Drop a rock or something on both sides of the tub at the same time. Make sure it is big enough so that it makes waves that go at least across the tub. Watch them interfere. Then realize water/air doesn't matter a wave behaves like a wave. Load/Push are not good terms. I also think you missed the word I used which was interfere. They will definitely have both constructive AND deconstructive interference. Neither are good in a sound system.

[Manetic09 0]

Thanks man i really appreciate it, i think this is the type of forum i've been looking for a long time.

[ssh 924]

Thanks man i really appreciate it, i think this is the type of forum i've been looking for a long time.

I'm going to have to say Hell Yeah!.

Tons of super knowledgeable people and for the most part not a lot of nut-huggers spewing bs left and right.

Also be sure to check out the Search function when your wondering about something, it's a goldmine of information.

[///M5 2,833]

That being said, it doesn't mean it won't "work". Everything about a car audio system is a compromise. Some you can choose your way around and others you can't. Personally my goal is to minimize those challenges of course dependent on budget, time, effort, etc.

[An-i-no 86]

I've wondered for a long time, how do "push pull" arrangements work? Is is relevent to the op's idea?

[Duran 387]

Push pull works because they are wired out of phase, that way they do not interfere in a negative sense.

[///M5 2,833]

I'd call that in phase, but of course from the box and acoustics perspective, not the drivers relative to their geometry.

[Julian 641]

I'd call that in phase, but of course from the box and acoustics perspective, not the drivers relative to their geometry.

What makes this alignment even desirable in the first place?

[cobra93 47]

^^^^^^^

Are you referring to isobaric?

If not disregard the below statement.

If you are, then you have twice the motor, twice the power handling and net box volume is cut in half.

This was most popular before higher power handling subs were available.

Kind of like dvc subs.

Edited October 1, 2011 by cobra93

[Julian 641]

^^^^^^^

Are you referring to isobaric?

If not disregard the below statement.

If you are, then you have twice the motor, twice the power handling and net box volume is cut in half.

This was most popular before higher power handling subs were available.

Kind of like dvc subs.

Ahh

[///M5 2,833]

I'd call that in phase, but of course from the box and acoustics perspective, not the drivers relative to their geometry.

What makes this alignment even desirable in the first place?

Absolutely nothing.

[Impious 1,476]

^^^^^^^

Are you referring to isobaric?

If not disregard the below statement.

If you are, then you have twice the motor, twice the power handling and net box volume is cut in half.

This was most popular before higher power handling subs were available.

Kind of like dvc subs.

Ahh

If you are referring to non-isobaric drivers mounted in a push-pull configuration (i.e. one driver mounted cone out, one driver mounted magnet out and wired electrically out-of-phase) then the even-order distortion is reduced because the distortion components are now 180^o out-of-phase even though the drivers are acoustically in-phase. Though I've seen widely varying claims in the amount of reduction.....anywhere from 3db to 10db+

As far as subwoofers mounted at opposite sides of the vehicle; I wouldn't worry about it as long as they are both wired to pressurize the airspace simultaneously (i.e. don't wire one out of phase, unless you have an extremely wide car). The dimensions are still "close" relatively speaking compared to wavelength in the subbass. Figure a 50hz note has a wavelength of 22.5 feet, so even if they are 3' apart as they might be in a trunk the amount by which they are acoustically out of phase is going to be very small compared to the length of the wave. The main thing in a car is to have them simultaneously pressurizing the airspace.

And just to make sure there's no confusion.....Isobaric mounting arrangements and DVC subwoofers have nothing in common. Isobaric was popular before "small" enclosure subs were plentiful, not high power handling drivers, as isobaric allows an enclosure half the size of a single subwoofer and back-in-the-day most subwoofers required larger enclosure volumes. This is where Kicker got the name for the Solobaric subwoofers.....they were supposed to work in enclosure sizes half the volume as comparable drivers on the market at the time without necessitating isobaric mounting, you only needed one driver instead of two....hence "solo".