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Peerless 830878 3-1/2" Passive Radiator

Brand:| Model: 830878
A useful alternative to overlong ports, passive radiators like the Peerless 830878 offer designers a well-proven method of extending and enhancing bass response.
  • Coated paper cone with rubber surround
  • Low resonance frequency for deepest possible bass
  • Cosmetic surface mount steel frame matches Peerless SDS series
  • Straight-sided frame fits into narrow enclosures and permits tight spacing
  • Compatible with small woofers by Peerless and others
Part # 
Weight: 0.3 lbs.  
Due In: 5/14/2014
List Price$15.99
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Buy 4-up$10.00
Part # 264-1060
Qty:  EA
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Product Details

Peerless 830878 3-1/2" Passive Radiator

The Peerless 830878 3-1/2" passive radiator is a cosmetic and performance complement to the Peerless SDS Series woofers. Its attractive stamped steel frame, coated paper cone, and rubber surround are visual and performance matches with the Peerless speaker drivers. Passive radiators are a viable alternative to ports whenever duct length exceeds available enclosure space. May be used in multiples to achieve desired performance.

Specifications: • Fs: 29 Hz • Cms: 791 um/N • Mms: 38.5 g • Rms: 4.8 kg/s • Sd: 50.2 sq. cm. • Dimensions: Outside diameter: 4.85", 4.14" across flats, Cutout diameter: 3.64", Depth: 1.35".

Product Specifications
  • Nominal Diameter3-1/2"
Peerless 830878 3-1/2" Passive Radiator
  • BrandPeerless
  • Model830878
  • Part Number264-1060
  • UPC844632083914
  • Product CategoryPassive Radiators
  • Unit of MeasureEA
  • Weight0.3 lbs.
  • 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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Peerless 830878 3-1/2" Passive Radiator

Product Q&A

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Peerless 830878 3-1/2" Passive Radiator

Comparable to what size port?

What size/length port would this PR be comparable too? Can you recommend any sites/software that can be used to calculate enclosures using small fixed PRs like this? Usually with larger ones you can adjust the mass to taste, but with this little guy you've got to be spot on.
Asked by: Beatnik
It's hard to compare really.With a port you can keep pushing more air, you are just forced to do it faster. As a result, port air velocity will go up until you start getting port noise (chuffing, whistling) which is undesirable.With a passive radiator, you are limited in volume, where the maximum volume of air (Vmax) to be displaced is Vmax = Sd * Xmech * 2. There is no "port noise" with a passive radiator; instead you might notice some mechanical noise due to the internal moving parts, specially when near the unit's mechanical limits.As for sizing, I'd suggest using an active speaker no larger than the passive radiator itself... so a 1:1 ratio as a minimum. For subwoofer application, you would typically see a 12" sub paired with 2 12" radiators, but that is strictly a subwoofer. I think something like this is more suitable to extend the low end of a full range speaker.As for adjustable mass, I would think it would be adjustable. Just doesn't make sense to have it be non-adjustable. Can we get an answer to this? Anyone else...
Answered by: Kennn
Date published: 2012-07-25

Xmax? Can you add weight?

I want to winISD this piece and need to know the Xmax. Knowing the thread size would also be helpful if it does, in fact, accept added weight.
Asked by: joeshmono1
Xmax is the maximum peak linear excursion of driver in mm.passives have a parameter name ,,, i just cant seem to recall what it is...if your concern is the radiator not having enough excursion against the active driver, you shouldn't be.Passive radiators generally surpass peak excursion by far and i personally never witnessed one that did not, OEM brands included.TIP:Epoxy Fender washers to center of dome for weight,,,, its cheap, effective and works....
Answered by: salvatore J
Date published: 2014-01-23

What's the rms ?

How many watts can this pr handle?
Asked by: mdfreeze
RMS is the power rating for anything you wire. Not a passive device such as this.
Answered by: Zobadar
Date published: 2014-03-24

I would like to bring the Mms up to 45 grams?

Are there any charts that would point me in the right direction as to how much weight to glue on? Any shortcuts would be appreciated. Buying a second PR seems excessive, and wont result in Mms 45g.Otherwise I suppose I could place talcum powder on it and play with a test frequency until I get my enclosure tuned right, but is there a better way that requires less trail and error/profanity?
Asked by: Glue
The moving mass of this radiator is 38.5 grams from the factory, so you simply need to add 6.5 grams to the rear of the cone.
Answered by: MattP
Date published: 2014-03-24

How do i tune this passive radiator ?

Asked by: juan23
Weight is to be added to the back of the cone or dustcap by gluing washers or other small weights to it.
Answered by: MattP
Date published: 2014-02-12

Can I use these to extend/increase low frequency output of a full-range 6x9 in a small, sealed enclosure? Would multiples improve lower frequency response vs. just one, such as to supplement 60-80hz range?

Asked by: dec272011
I would not recommend a passive this small to be used with a 6x9. Something like our 8" Dayton would be a better choice although I cannot model the box volume or tuning frequency without driver specs.
Answered by: MattP
Date published: 2014-03-18

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