I hope some folks can answer 3 questions about passive radiators:
1. Can they be placed in a downfiring position on the bottom cabinet panel?
2. If two passives are used, must they be placed on opposite walls for best performance?
3. In general, is the least added mass best for long term function?
Thanks in advance for your help!
1. Can they be placed in a downfiring position on the bottom cabinet panel?
2. If two passives are used, must they be placed on opposite walls for best performance?
3. In general, is the least added mass best for long term function?
Thanks in advance for your help!
Hi,
1) Usually not, as they are most likely to have cone mass sag issues.
(Unless that it is taken / takes into account the suspension design,
basically some ABR's asymmetry can be arranged to work better.)
2) Basically yes, compared to other options, left and right.
3) No. The best added mass is the best for the target function.
(Added mass should not effect the longevity of the ABR.)
rgds, sreten.
1) Usually not, as they are most likely to have cone mass sag issues.
(Unless that it is taken / takes into account the suspension design,
basically some ABR's asymmetry can be arranged to work better.)
2) Basically yes, compared to other options, left and right.
3) No. The best added mass is the best for the target function.
(Added mass should not effect the longevity of the ABR.)
rgds, sreten.
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WRT to (3) the effect of the added mass would depend on the amount of added mass, how it is added, and what the original unit has for a suspension (spider and surround, both).
With enough added mass, long term there can be effects upon the unit in terms of sag and stress...
For most users, with the target frequency of the passive close to where most woofers operate in a ported enclosure - that being in the ~40Hz +/- range, it's not much of an issue. Try to get down below 30Hz. and you are adding a significant amount of mass.
All bets off in that case!
This has been my experience. Ymmv, of course.
_-_-bear
With enough added mass, long term there can be effects upon the unit in terms of sag and stress...
For most users, with the target frequency of the passive close to where most woofers operate in a ported enclosure - that being in the ~40Hz +/- range, it's not much of an issue. Try to get down below 30Hz. and you are adding a significant amount of mass.
All bets off in that case!
This has been my experience. Ymmv, of course.
_-_-bear
Yes that is of utmost importance. You can't put 2 tons on a half ton truck without concerns. The idea, I think, was to point out that the correct load is better handled when the driver flange is vertical.
what part of a speaker/passive is a driver flange? - newbie
The flange is just the part of the basket that secures the loudspeaker to the cabinet, ie the part you normally flush mount into the cabinet.
The flange is the part you screw to the speaker baffle.what part of a speaker/passive is a driver flange? - newbie
The flange is connected to the speaker frame.
Inside the flange is the annulus, then the cone, and the dustcap goes over the center portion of the cone.
Behind the cone is the spider, some speakers use two spiders.
A passive radiator, having no voice coil or magnetic gap, does not need a spider or a frame, though most do have a frame simply because that is the way speakers are tooled.
Most also have the spider too, no doubt to help keep the parts in alignment. A 500-1kg mass is quite a heavy weight for only the surround to support.
While technically not a requirement to "be" a passive radiator - aka "drone cone" - if it does not have a spider or equivalent means of keeping the motion linear in one axis, it will not perform properly.
The internal nodes in the box do NOT push linearly on the surface of the PR. In essence the PR integrates all the various nodes into linear motion. Without the spider or equivalent the surface of the PR will do all sorts of odd gyrations. Quite interesting to see!
_-_-bear
The internal nodes in the box do NOT push linearly on the surface of the PR. In essence the PR integrates all the various nodes into linear motion. Without the spider or equivalent the surface of the PR will do all sorts of odd gyrations. Quite interesting to see!
_-_-bear
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