HI, After an extensive research i was unable to find an answer about the placement of passive radiators when i in this case have 2 passive radiators. i am unsure about the acoustical properties if i where to mount one on each side of the enclosure or both on the back like an examble the march audio sointuva speakers. bracing the enclosure is way harder with them mounted on the sides, although vibrations from each passive radiator will cancel out eachother. mounting them on the back i would imagine making a rocking movement when playing loud or very low frequencies. in my case i got a purifi extended woofer and a sb acoustic tweeter together with 2x passive radiators from purifi and i would make an enclosure around 16L of internal volume. the placement of the enclosure is going to be very close to the back wall
I am asking the forum for some help and guidance in choosing the placement, hopefully people have some good suggestions
Kind Regards - Marcus Helweg from Denmark
I am asking the forum for some help and guidance in choosing the placement, hopefully people have some good suggestions
Kind Regards - Marcus Helweg from Denmark
Hi @MarcusHelweg,
First, I must confess that I never ventured in the passive radiator territory...
Assuming that the two passive radiators are identical per enclosure, I would have been ready to place them at the back of the enclosure, like it is done on say, a Klipsch Quartet, Forté or Chorus II. But since your speakers will be close to the back wall, it's not easy, then. Maybe for compactness (16L), a Left and Right placement of the radiators would be best ? Then you could brace the two passive radiators by a back-to-back soundpost, for bracing simplification...
T
First, I must confess that I never ventured in the passive radiator territory...
Assuming that the two passive radiators are identical per enclosure, I would have been ready to place them at the back of the enclosure, like it is done on say, a Klipsch Quartet, Forté or Chorus II. But since your speakers will be close to the back wall, it's not easy, then. Maybe for compactness (16L), a Left and Right placement of the radiators would be best ? Then you could brace the two passive radiators by a back-to-back soundpost, for bracing simplification...
T
You've already basically answered your own question. Assuming a uniform / near-uniform internal air-particle density, then as far as the passive's operation itself goes, it doesn't really make any difference & won't unless external factors like extreme proximity to a boundary (where it's possible that a form of slot - horn loading) comes into play. Otherwise -push-push should give some cancellation of the mechanical modes so can be useful if dimensions & in-room positioning allow. Whether that makes a difference will depend on the box construction. Otherwise, rear-panel or whatever you really feel like.
@Scottmoose
So you would Mount the 2 passive radiators on the rear of the speaker enclosure so i can actually brace the inside despite the rocking that could occur if played very loud? couse i would guess that rocking could transfer to whatever the speakers are gonna be standing on?
So you would Mount the 2 passive radiators on the rear of the speaker enclosure so i can actually brace the inside despite the rocking that could occur if played very loud? couse i would guess that rocking could transfer to whatever the speakers are gonna be standing on?
I'd say do whatever you feel is most effective for you, and you can build most effectively. If you use rear mounted passives, you have the option of employing longitudinal bracing that clamps both the rear of the PBR and the rear of the driver together, and to both the front & rear baffles. Longitudinal bracing tends to be more effective than horizontal anyway, so is my default recommendation when possible. Same applies for side-mounted units, with a longitudinal brace for the side baffles, preferably keyed into a front-rear longitudinal.
Perfect, that answers all of my questions and thoughts about the placement of them, Thank you so much!! <3