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Dayton Audio SD270-PR 10" Passive Radiator
Do passive radiators generate their own "frequencies", or are they totally dependent on the woofer driving them?
The 10" Dayton PA255-8 has an FS of 46hz, the 10", the Dayton SD270-PR passive has an FS of 20hz. Is hitting 20Hz possible when the acive driver only goes to 50 Hz or so? Thanx.
See if this is any clearer. A speaker consists of a motor, mass, spring and resistance.The motor is the magnet and voice coil.The mass is everything that moves in a loudspeaker; voice coil, cone, and the air mass in a port or the cone of a passive radiator,etc.The spring is the voice coil spider (spring) & surround, spider and surround of the passive radiator, and the air inside the enclosure.A ported or passive loudspeaker works when the motor moves the cone and the cone "bounces" against the air in the box. The idea of a port or passive is to adjust the mass so that it "bounces" in unison with the speaker cone at a particular range of frequencies. When this is achieved, the two cones #or the cone and port# produce much more output than the driver alone. Ports and passives are used to increase a driver's efficiency in the low frequencies because together they can more easily move more air #and as we know, the lower the frequency the more air that needs to be moved to produce a given sound level#.There is a low frequency limit, however and below the design frequency the driving cone and port or passive fall out of phase and the driver can move beyond its safe limits and hit bottom if a bass note this low is played loudly.Anyway - the short answer to the first part of your question is no and the second part is yes.
Date published: 2012-09-05
how can a passive radiator have an impedence of 4 ohm when it's non electric
Acoustic impedance, dependent on the box pressure & cone velocity
Date published: 2013-07-26
What is the recommended enclosure for 2 of these paired with 1 Dayton Audio SD270A-88 10" DVC Subwoofer?Has anyone else done this?I'm a first time builder and am thinking of doing this with a Dayton SA100 100W Subwoofer AmplifierAny other info is appreciated regarding the weights or otherwise.
A 2.5 cu ft enclosure with two of these with 100 grams added mass to each cone and the dayton dvc subwoofer looks good. Your f3 would be in the low thirties but 100 watts is a little much it only takes 50 watts to reach x-max, so you would be fine going with the 70 watt plate amp. If you are not set on using the passive radiators you can get almost the same response in a 2 cu ft ported enclosure. Using the 3" x 11" flared port plus the 70 watt plate amp and save yourself almost $100 over these PR's and the 100 watt amp. Just a suggestion.
Date published: 2013-09-29
Will this work as a down firing passive radiator?
I want to replace the down firing "passive radiator" in my Velodyne 810X. Facotry radiator is a disk and a elastic band stretched to the top of the box. But what will facing this passive radiator down do to the spider and the surrounds?
Date published: 2013-05-20
Will these work as replacement Passive Radiator in the Optimus T-110 speaker tower?
Speaker size matches. I know I'll have to drill new mounting holes, as the original woofer had 4 holes, but hope that's all.
Yes these will work as replacements, you may have to play around with different weights added to the cone until you get the sound you want.
Date published: 2013-09-17
What's the maximum added mass supported by these?
There is not a maximum mass spec, but the general rule of thumb is to try and avoid going over three times the moving mass. In this case that would be 300 g total.
Date published: 2013-01-11