Dayton Audio SD215-PR 8" Passive Radiator

Brand:| Model: SD215-PR
The Dayton Audio Passive Radiators are excellent general-purpose passives suitable for replacement or for new construction.
Part # 
Weight: 1 lbs.  
List Price$22.99
You Save22%
Your Price
Buy 4-up$17.25
Part # 295-492
Qty:  EA
Available Payment Methods

Product Details

Dayton Audio SD215-PR 8" Passive Radiator

The 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: 21 Hz • Vas: 1.40 cu. ft. • Qms: 2 • Cms: 0.75 mm/N • Mms: 75 g • Sd: 194 sq. cm. • Xmax: 9 mm • Dimensions: Overall diameter: 8.50", Cutout diameter: 7.09", Depth: 2.28".


Product Specifications
  • Nominal Diameter8"
Dayton Audio SD215-PR 8" Passive Radiator
  • BrandDayton Audio
  • ModelSD215-PR
  • Part Number295-492
  • UPC844632000393
  • Product CategoryPassive Radiators
  • Unit of MeasureEA
  • Product Rating
    (11 Reviews)
  • Weight1 lbs.
  • Case Qty12
  • 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.

Similar Products

View similar products to the Dayton Audio SD215-PR 8" Passive Radiator
in the Passive Radiators product category.


Dayton Audio SD215-PR 8" Passive Radiator
Dayton Audio SD215-PR 8" Passive Radiator is rated 4.3636 out of 5 by 11.
Rated 5 out of 5 by from Contol The Bass In Reflex Full Range SpeakerI had purchased a pair of Audio Nirvana Super 8 ALNICO full range drivers after being told that they were the "perfect storm" speaker and that they provided the most bass of all the different Audio Nirvana drivers. I built an enclosure to specifications provided by the manufacture and was left with a bass reflex speaker that has fantastic mids and highs but the bass was uncontrolled and left much to be desired. They sat unused for years and then I decided to try putting a passive radiator in the enclosure to see if that would help. Wow, exactly what was needed. The passive radiator provided the control that was missing with just a 3" port. The tight and precise bass is so smooth and real. It truly was the missing piece to this loud speaker.
Date published: 2014-08-22
Rated 4 out of 5 by from Great replacement for Sunfire Tru Jr. SubwooferThe screw holes don't line up with the existing holes, but a few new screws and a drill takes care of all of that. Great replacement for the radiator of a Sunfire Junior Subwoofer. Once the woofer stretches out and gets loose, it works and sounds great.
Date published: 2014-08-06
Rated 4 out of 5 by from Replaced blown Sunfire Super Junior passive radiatorI bought this to replace a blown Sunfire Super Junior passive radiator. It fit the hole perfectly. I believe it, like any speaker, could use some warming up and stretching before criticizing it. In the week I have had it in the enclosure, I believe it has warmed up considerably. I have yet to meter the sub again and I have yet to open the amp on it but my initial observation is saying that I will need to pin the volume back a little. Great price, great value and it does the job!
Date published: 2013-09-09
Rated 4 out of 5 by from Excellent alterative to porting.Bought these to use in a DIY home theatre sub along with an 8" Tangband. I like the sound better than ports. Bass is tight and controlled with no port noise. The option for adding weight to change the resonance is a nice feature and is easier than trying different port lengths for tuning.
Date published: 2013-05-21
Rated 5 out of 5 by from passive-ly speaking.I had a TB 6x9 woofer collecting dust on the shelf, decided to match it with the 8'' passive radaitor in a .33cf box. Unit sounds good.
Date published: 2011-04-19
Rated 5 out of 5 by from oooh! Rad(iator)!I built a triska and love it! Don't ask toooo much as it's just a lil 70 watt 8" but it's pretty rad, I must say!
Date published: 2009-11-12
  • 2015-02-28T06:28CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_11
  • loc_en_US, sid_295-492, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Dayton Audio SD215-PR 8" Passive Radiator

Looking to make a small subwoofer for the garage using this with the Tang Band W6-1139SIF 6.5. Is .33 cubic ft. the ideal size and how much weight would i need to add?

Asked by: MEMFIS
Yes that volume is perfect. I would add 75 grams to the passive which will provide a tuning frequency of 35 Hz and an F3 of 44 Hz.
Answered by: MattP
Date published: 2015-01-19

I am making a cooler stereo. I am dividing the space for cold drinks on one side and the stereo components on the other. I am using (2) 5 1/4" Polk Audio Marine speakers and a 8" Polk Audio Marine Subwoofer. Will a passive radiator benefit this build?

Asked by: Just Jeff
Unfortunately without being able to model is properly there is no way of knowing whether it will be beneficial or not. Generally speaking, marine and car subwoofers will be best suited for a sealed box so adding a passive will create a bump in the response, almost like a bass boost. This may or may not be something you like.
Answered by: MattP
Date published: 2014-07-22

What is the correct Mms? It is listed on this and the 10" as 0.75g an absurd #-looks like it was accidentally rekeyed from previous param-should be in the hundreds

Asked by: magcat
Yes the decimal is in the wrong place, this should be 75 grams.
Answered by: MattP
Date published: 2014-03-20

What is the Maximum weight you can add to this series of Dayton PRs ?

Thanks... I searched and found nothing.I'd assume anything in the ounces (sub 500grams) and not pounds will be fine.
Asked by: A John
A good general rule of thumb for any passive radiator is to add no more than 3 times the Mms of the radiator in question. This radiator's Mms is 75g, so 225g would be the absolute maximum you'd want to add. If the system will be subject to very low frequencies and/or high power, i.e., "pushed to the limits," then 2.5 times the Mms might be a better choice, 187g or so in this case.
Answered by: RussR
Date published: 2015-01-15

this is the box mesurements and sube detials

ok the box use 1.5 cm thick wood i dk what kind the mounting depth it 10.5 inch and the port is 2.5 inch diameter and 4.5 inch long the box is 35.5 inch tall and 14 inch wide and 11 inch in length the sub i am use in the dual ds12 500watt max and 125 watts rms also i add a picture as well as a link to the sub and i know its not for home audio but i am on a relly tight budget
Asked by: colton puckett
Without knowing what kind of amp will be used, or how the system is used, I would suggest a passive radiator of larger excursion and diameter for use with this 12" Dual sub. At least a 12" PR.
Answered by: C from Claypool
Date published: 2012-02-17

this is in regards to my other quistion about mt 12 inch sub

OK what i ment by not enough bass i can fell the bass as much as i would like i would like to have and the box i have is a custom box and its about 2 and a half felt long and 13 inches wide with a mounting depth of about 10 inches these are not exact but give or take a couple inches the sub is 500max and 125 rms i was thinking about getting another 12 inch but i cant fine a cheap one that i get as close on the watts for it and the box is ported idk what it is tuned at i got it from a friend if u know a way to find out let me know
Asked by: colton puckett
If you could post the brand and model of your speaker and the exact measurements of the enclosure (including wood thickness) and the exact size and length of the port, I can probably give you the tuning frequency of your current enclosure.Honestly it doesn't sound like this is the answer to your question though. If what you have isn't giving you enough bass in any way, and you are using a 12" sub the passive isn't likely to really give you any real improvement in that direction.A rule of thumb with passives is to use twice the radiator size as the driver size which means two 12" passives for one 12" subwoofer. Even at that, you are going to "tune" them similarly to a port and your output is more likely to go down in terms of DB as opposed to a properly tuned ported enclosure.Bass amount is relevant to two things. Driver area and power. If you want a lot more bass than you have, your best bet is likely to be to purchase a better sub with a custom enclosure built for the driver and the room and/ or add more power to your setup. Give us some more details and we can probably make some comparisons for you.
Answered by: Musgofasa
Date published: 2015-01-15
  • 2015-02-28T09:01CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_10
  • loc_en_US, sid_295-492, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

Customer Projects

Customer projects that include: Dayton Audio SD215-PR 8" Passive Radiator

If you built a project using this product, post it in the Parts Express Project Gallery.

Customer Discussions

If you would like to start a discussion about this product, post a thread in the TechTalk Customer Forum.

Recently Viewed Products

Get Deals
emailed to you every week.

Be the first to hear about new and exciting products,special pricing and incredible deals!

See This Week's "GET DEALS" Email
Parts Express
725 Pleasant Valley Dr.Springboro,OH 45066USA

© 1996-2015 Parts Express, All Rights Reserved

Live Chat Software