I am building my custom sub, and using SpeakerBoxLite I settled on my initial design for an SB Acoustics sub driver in a 13" sealed box.
When I model better/ deeper options using passive radiators, I land on a couple of interesting options using a taller box with 2 radiators. However, it got me wondering how active options might work.
Passive radiators move in opposite direction to the main woofer, and maintain air pressure levels in the sealed box. That much is obvious to me. Simple physics.
How would a sub react if I have a sealed box with 2 drivers, hooked up to the same amp either in parallel or series, such that the main driver pushes out while the supporting driver reacts inward? Is that what Push-Pull means? And how is that different than passive radiators? It still maintains pressure equilibrium inside the box.
When I model 2 driver Push Pull in SpeakerBoxLite tho, I get massive differences from a similar Passive Radiator setup.
When I model better/ deeper options using passive radiators, I land on a couple of interesting options using a taller box with 2 radiators. However, it got me wondering how active options might work.
Passive radiators move in opposite direction to the main woofer, and maintain air pressure levels in the sealed box. That much is obvious to me. Simple physics.
How would a sub react if I have a sealed box with 2 drivers, hooked up to the same amp either in parallel or series, such that the main driver pushes out while the supporting driver reacts inward? Is that what Push-Pull means? And how is that different than passive radiators? It still maintains pressure equilibrium inside the box.
When I model 2 driver Push Pull in SpeakerBoxLite tho, I get massive differences from a similar Passive Radiator setup.
Will move this to the subwoofer design forum.
At some frequencies they will, but then not much will be achieved.
A passive radiator is tuned to resonate with the woofer and work with it in the bigger picture. Pressure in the box will increase accordingly. The resonance means phase will vary between the woofer and passive radiator.
Interesting. Would that effectively result from a lag by the radiator to respond as quickly as needed to the motion of the main driven subwoofer?
It's more the natural reactance of the mass of the radiator and it's stiffness. In any case, it's not so different to the way a port behaves.
That would unload both drivers, cancel most of thier output and leave them with very low powerhandling. It's pretty much the worst thing you can do.
No, that has 2 drivers on opposite sides of an enclosure or 2 drivers on the same baffle with one mounted cone out and the other frame out, but in all cases both cones move in sync in and out of the box. The idea with this arrangement is it cancels any non leanearity in the drivers motors and odd harmonic output.