Dayton Audio SD270-PR 10" Passive Radiator

Brand:| Model: SD270-PR
The new Dayton Audio Passive Radiators are excellent general-purpose passives suitable for replacement or for new construction.
Part # 
Weight: 1.5 lbs.  
List Price$32.99
Regular Price$26.50
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Part # 295-494
Qty:  EA
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Product Details

Dayton Audio SD270-PR 10" Passive Radiator

The new Dayton Audio Passive Radiators are excellent general-purpose passives suitable for replacement or for new construction. A built-in mass disc offers a good starting point for most designs, and a convenient M5 threaded hole (screw included) allows different types of weights to be added if desired. Cosmetically and mechanically, the passives match the Shielded DVC line of subwoofers, with a poly coated paper cone and medium-roll rubber surround for clean excursion and long life. The possibilities with these passives are endless, from floor standing two-ways to small active/passive subwoofer systems.

Specifications: • Fs: 19.5 Hz • Vas: 3.90 cu. ft. • Qms: 2.50 • Cms: 0.67 mm/N • Mms: 100 g • Rms: 4.89 kg/s • Sd: 340 sq. cm. • Xmax: 10 mm • Dimensions: Overall diameter: 10.63", Cutout diameter: 8.94", Depth: 2.81".


Product Specifications
  • Nominal Diameter10"
Dayton Audio SD270-PR 10" Passive Radiator
  • BrandDayton Audio
  • ModelSD270-PR
  • Part Number295-494
  • UPC844632000409
  • Product CategoryPassive Radiators
  • Unit of MeasureEA
  • Product Rating
    (19 Reviews)
  • Weight1.5 lbs.
  • Case Qty8
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Dayton Audio SD270-PR 10" Passive Radiator
Dayton Audio SD270-PR 10" Passive Radiator is rated 4.4737 out of 5 by 19.
Rated 5 out of 5 by from Great performerI used this to replace the passive radiator in my 20 year old Velodyne subwoofer. After a little modification to the speaker cabinet opening size, the sub has never sounded better.
Date published: 2014-04-08
Rated 5 out of 5 by from Dayton Audio SD270-PR Passive Radiator ReviewI have a pair of Synergistics speakers from Tokyo Shapiro's in the 80's. The passive radiators were decomposed. I bought a pair of these 10" radiators. I think these speakers are better now than when they were new. Lots of bass and air movement. I plan to replace the 8" Woofers with speakers from Parts Express. Thank you. Would definitely buy again 1000%.
Date published: 2014-01-23
Rated 5 out of 5 by from Good valuePurchased the 10" passive radiator to replace the blown one in my 15 year old Velodyne VA 810 XI subwoofer I am restoring to use with a secondary stereo. It works great with the new driver. Very satisfied.
Date published: 2014-03-10
Rated 4 out of 5 by from VA-8100x replacementI dropped this in to replace my very aged Velodyne, broken, 10" radiator and I was very surprised at the quality of the cone assembly. It's very good. Much better than I would expect at the price point. The surround is pliant and good quality and better than the original. For the price I paid this was a no brainer. I've not taken measurements yet but I'm very happy with the results.
Date published: 2013-02-12
Rated 5 out of 5 by from A step up.I decided to go with these radiators with the idea my old ESS's could use something better than the old "plate" style(that were shot again, being replaced once before) that had been in them. The quality is so much better with the Dayton's, it's not even funny. But little did I know it was not going to be an easy install when I ordered them. Turns out my old radiators, being the plate type(they are just a flimsy gasket, surround, and a foam flat plate instead of a cone) are about 1/2" smaller than the Dayton's. So the Dayton's would not fit into the routed recess in the cabinet. I contemplated routing out the cabinets, or cutting down the frame of the Dayton's. Then it hit me, I still had the old gaskets from the old radiators, and with some caulk, would sit almost flush reset into the old routed mount in the cabinet. Then put another layer of caulk on top of that and installed the Daytons over the old gaskets, and screwed them down. No problem. Good seal. The bass is better than I ever remember these cabinets sounding. Bass has always been described as "flabby" on almost all ESS's. These were like that too. I would say the bass is not more pronounced, just way tighter. But I am working off of memory here, and lots of things have changed as far as different equipment driving the speakers, and different room etc. It would have been nice to get some kind of explanation of how you are supposed to tune these radiators with the weights you can supposedly attach to them. And what you are supposed to use as weights. But, I'm very happy with what I've got just straight out of the box. If I decide to, I guess I can pull them off and tweek 'em some other time.
Date published: 2011-04-14
Rated 5 out of 5 by from The other key component for my rebuild....Put this in my Klipsch sub rebuild as well. I do not hesitate to say this psssive is far superior to the orig. Tighness, definition and volume by the bushel emanate from my updated junkyard dog now. Big hi five Dayton!!!!!
Date published: 2013-08-06

Product Q&A

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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.
Asked by: gfederys
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.
Answered by: KVESKY
Date published: 2012-09-05

how can a passive radiator have an impedence of 4 ohm when it's non electric

Asked by: spunky
Acoustic impedance, dependent on the box pressure & cone velocity
Answered by: Jordon Gerber
Date published: 2013-07-26

Recommended Enclosure

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.
Asked by: IrishCream
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.
Answered by: mtg90
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?
Asked by: Patrick Middleton
Answered by: unk1
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.
Asked by: ibreakbanjos
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.
Answered by: MattP
Date published: 2013-09-17

Would 2 of these be sufficient to pair with a JL 12W7? I'm looking at a 6 ft/3 enclosure, and 18hz tuning

I would not recommend two of these for that woofer. You will need something like the TC Sounds VMP 12" in order to handle the excursion.
Answered by: MattP
Date published: 2014-01-06

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