Dayton Audio RS225-4 8" Reference Woofer 4 Ohm

Brand:| Model: RS225-4
The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Woofer features a black anodized cone, heavy-duty 6-hole cast frame, low-loss rubber surround, solid aluminum phase plug, rubber magnet boot, and gold spring terminals.
A restocked/refurbished, or Open Box unit of the product is available -- see it now
  • 4 ohm impedance is perfect for series pairs in MTMs and center channel speakers
  • Excellent car audio midrange/midbass
  • High-end low-distortion motor with two shorting paths to reduce inductance
Part # 
Weight: 5.9501 lbs.  
Due In: 4/9/2015
List Price$75.99
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Your Price
Buy 4-up$55.36
Part # 295-376
Qty:  EA
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Product Details

Dayton Audio RS225-4 8" Reference Woofer 4 Ohm

The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Utilizing a low-distortion motor system with two short-circuit paths and a rigid aluminum cone, the Reference Series can outperform drivers that cost several times the price. Their low-distortion characteristics and high excursion capabilities provide exceptional clarity, detail, and dynamics. Woofer features a black anodized cone, heavy-duty 6-hole cast frame, low-loss rubber surround, solid aluminum phase plug, rubber magnet boot, and gold spring terminals.

Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)80 Watts
  • Power Handling (max)160 Watts
  • Impedance4 ohms
  • Frequency Response35 to 2,300 Hz
  • Sensitivity92.1 dB 2.83V/1m
  • Voice Coil Diameter1.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)35 Hz
  • DC Resistance (Re)3.15 ohms
  • Voice Coil Inductance (Le)0.49 mH
  • Mechanical Q (Qms)2.02
  • Electromagnetic Q (Qes)0.52
  • Total Q (Qts)0.41
  • Compliance Equivalent Volume (Vas)1.64 ft.³
  • Mechanical Compliance of Suspension (Cms)0.72 mm/N
  • BL Product (BL)6.38 Tm
  • Diaphragm Mass Inc. Airload (Mms)32.2g
  • Maximum Linear Excursion (Xmax)6 mm
  • Surface Area of Cone (Sd)213.8 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter8.78"
  • Baffle Cutout Diameter7.24"
  • Depth3.62"
  • Bolt Circle Diameter8.23"
  • # Mounting Holes6
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.613 ft.³
  • Sealed F367 Hz
  • Vented Volume1.51 ft.³
  • Vented F335 Hz
Dayton Audio RS225-4 8" Reference Woofer 4 Ohm
  • BrandDayton Audio
  • ModelRS225-4
  • Part Number295-376
  • UPC844632054259
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (29 Reviews)
  • Weight5.9501 lbs.
  • Case Qty4
  • 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 RS225-4 8" Reference Woofer 4 Ohm
Dayton Audio RS225-4 8" Reference Woofer 4 Ohm is rated 4.6207 out of 5 by 29.
Rated 2 out of 5 by from DissapointedI bought one of these as a test pilot and put it into a 3-way sealed enclosure. Used the Dayton 3-way crossover 500/4000 with the Dayton reference 4" mid driver and the Dayton 1 1/8" silk tweeter. Weak base response and very unstable at moderate volumes. Have 70W RMS to the speaker. Was planning on putting (4) of all the components into a tower for my mains.
Date published: 2015-02-17
Rated 5 out of 5 by from Great mid range mid bass speakerI purchace 4 of these for my 2003 aurora and let me tell you these speakers are great perfect they are the best midrange speakers I ever heard..… these are not subwoofers any thing under 80 hz can damage them at high power ,great price,perfect sound an to add parts express great customer service you can't go wrong
Date published: 2013-09-05
Rated 5 out of 5 by from These are superbCouldn't ask for more. I built these 3way 4ohm "towers" from SCTRATCH took about a month of full time work to get them flawless.Cherry veneer with 6 coats thinned poly applied with foam brushs in a very heated bathroom and has a mirror finish the 8 in Dayton reference woofer below @45-750hz hit like a hammer and has fanastic clarity the tweeter is a discontinued vifa ring radiator $55 ea. the"top" 8 in. Driver in the photo is an infinity 750-3000hz. I replaced it with a visaton 8 in "mid" but had to box them up and store before I got pic.was powering with a Pioneer elite amp.Sucks that i had to move to a small place where I can't use them.
Date published: 2013-01-10
Rated 5 out of 5 by from Better then many botique driversAfter 2 years of heavy usage in my very over powerd PC/Audio mixing/sound room- well they still live! Using a Bryston 4bST 200wpc amp to drive these lil' 8's, crossed over at 240hz & 440hz #2 per channel per cab to make 8 ohms#- in pure digital. All I can say, I am impressed, better low end extention would be nice, but there would be a price. These are great drivers. No they are not sub worthy- but they are very accurate above 60-80hz, esp. in the lower mid-range. I have these in modified HK 50 towers #a very high end speaker in it's day#, and they blow the original Seas/JBL drivers out of the water. I also run a pair of M&K MX 250 subs with these, they blend perfectly.I would highly advise anyone that uses these woofers- try 375-500hz xovers, then try out the Hi-Vi tweeter/midrange line up- for the money, even 10 times the money, you wont beat the Hi-Vi's, esp their ribbons. Ignore the Power ratings- I believe they are full sign wave, not what the drivers are actually rated for.You really can't go wrong with these drivers, if you use them as intended. My only complaint is cosmetic- change the color of the center bullets- gold- greay, silver, something #maybe deep red- very cool#.Cheers!!
Date published: 2012-12-07
Rated 5 out of 5 by from "Perfect" replacement for Infinity Kappa 6.1 IIIn addition to being an audiophile I am a bit of a Cragslist junkie. I sepend a lot of time on the site looking for deals that I can land and flip for a profit. I came across a set of Infinity Kapp 6.1 seies 2 towers for $125. I remembered hearing these speakers a lot back in the mid 90's and thinking wow these would sound great if the woofers weren't so boomy. They have a ton of loyal fans though so my initial thought was to buy these and flip them for double on e-bay.After I got them home I had too much fun auditioning them (in several rooms and setups), and also noticed the cabinets went well with my mid-century modern decor. I couldn't get over how boomy and muddy the Bass was though. I devised a plan to create a custom tower using these nice enclosures, and to sell the rare drivers on e-bay. Well I went away on buisiness for a week and while I was gone my 2 year old son poked holes right through the woofer foam on both of the original IMG drivers. Now my plan to part out and re-design had some urgency. I decided that the best thing to do was just get the woofers I wanted now and upgrade the rest later just to get the things working. I spent some time measuring and looking up specs and reviews and decided on these rs225-4's.Well I have had these woofers running for a few months now and they have shot my plans to heck. They match so well with the existing crossovers and cabinets that I am now just using these as my stereo mains in my living area. At first they were a bit tight and I had to turn my mids and highs down to compensate, but now that they have fully worn in I am back to normal x-over levels.These drivers along with dampening the ports with two stuffed animals have brought the low end alive in my towers. My bass drops flat into the low 30 hz range now with decent extension into the mid 20's, where before it was a boomy mess between 40-60 HZ and not much of anything below that was audible. I can't say much for the max output of these as I live in an apartment so I can't turn them up nearly enough to stress them, but I'm sure that with the x-max and power handling specs they have that they are top notch for an 8" woofer.
Date published: 2012-11-12
Rated 5 out of 5 by from Great!The whole RS series is great. I'm using these in a set of 2-ways crossed at 1800khz. I'm not sure what specs are correct but when I run the 2 that I have through WT3 I get a different spec than Dayton specifies. I've attached a screen shot.
Date published: 2012-10-10
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Dayton Audio RS225-4 8" Reference Woofer 4 Ohm


Asked by: GENOB
Answered by: GENOB
Date published: 2015-02-07

If I wire two of these in parallel it will result in a 2 ohm load and a +6db gain in sensitivity. Then if I wire the above load in series to a third driver it will result in an overall load of 6ohm and no change in sensitivity, right?

Asked by: btucker
Technically yes, but this is not how you wire three drivers together. The two in parallel will still receive twice the input power since they are wired to a 2 ohm load. The only way to properly wire three drivers together is either all in series or all in parallel.
Answered by: MattP
Date published: 2015-02-05

I have the 8 ohm version of this woofer. I have 2 options in a 3-way setup. Place 4x RS225-8 into the same cabinet to have 8 ohm load, or use 2x RS225-8 wired in parallel, then RS225-4 wired in serial to have 8 ohm load. Which option is better?

Asked by: Joosoof
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-08-25

Thanks for the answer about the rubber magnet cover...with that removed, how much does it change the mounting depth?

Asked by: Petemoss
The mounting depth is not affected b the boot.
Answered by: MattP
Date published: 2014-05-19

I have a very tight enclosure parameters...it seems from the photos that there is a rubber cover over the magnet.  Can that be removed...if so, are there specs on the actual magnet width and mounting dept without the cover.  

Asked by: Petemoss
These no longer include a rubber magnet boot. The magnet dimensions are 4-3/4" in diameter and 1-1/4" thick overall.
Answered by: MattP
Date published: 2014-05-19

I am looking to use this in an auto application where i have a .42Cft sealed enclosure crossed over at about 1500 hz.  Will this driver fair reasonable well there?  If i wanted it to go a bit lower, could I port this enclosure and if so how?

Asked by: Petemoss
This will work fine in that volume, you can expect useable extension down into the 40's. I would not recommend porting that enclosure.
Answered by: MattP
Date published: 2014-05-19
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