Hifonics HFi12D4

12" Dual 4 ohm HFi Series Car Subwoofer

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12” Dual 4 Ohm HFi Series Subwoofer • 600W Max • 300W RMS • Injected Poly Light Rigid Cone • 1” NBR Reinforced Rubber Surround • Dual 4 ohm High-Temp KSV Voice Coils • Heat Dispersing Ported Back Plate • High Strength ABS Motor Cover

Learn more about the hfi12d4

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

hfx12d4bk thumbnail

Hifonics HFX12D4BK

OUR PRICE: $34.95

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Product Highlights

12” Dual 4 Ohm HFi Series Subwoofer • 600W Max • 300W RMS • Injected Poly Light Rigid Cone • 1” NBR Reinforced Rubber Surround • Dual 4 ohm High-Temp KSV Voice Coils • Heat Dispersing Ported Back Plate • High Strength ABS Motor Cover



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Big Bass on a Budget

When it comes to superior bass without a hefty price, the Hifonics HFi subwoofers take the lead. Hifonics has developed this great looking subwoofer specifically as an entry level subwoofer, however they integrate many of the technologies found in their high end subs. Sturdy spring loaded terminals ensure a secure connection that will not come loose. The high-energy magnet is surrounded by a anti-resonant rubber boot cover. A cooling system surrounds the multiple layer, high temperature voice coil to assist in keeping the voice coil cool. These incredible starter subwoofers are designed for enhanced thermal dissipation, more power handling, long excursion capability and highly optimized motor/suspension system that ensures clean, articulate bass reproduction with impressive low frequency extension. For the biggest bass on a budget, look to the Hifonics HFi series subwoofers!

  • 12" Dual 4 Ohm HFi Series Subwoofer
  • Power Handling:
    • Peak: 600 watts
    • RMS: 300 watts
  • Impedance: Dual 4 ohm
  • Injected poly light rigid cone
  • 1” NBR Reinforced rubber surround
  • High-excursion rubber surround
  • Integrated one piece poly cotton spider
  • Poly-mica cone damping
  • Nickel plated push and insert speaker terminals
  • Dual 4 ohm high-temp multi-layer high-temp voice coil
  • Front-plate and voice-coil cooling
  • Poly light dust cap
  • Heat dispersing ported back plate
  • Ultra ridged chrome stamped steel basket
  • High strength ABS motor cover
  • High-energy magnet
  • Large air cooled magnet assembly
  • Anti-resonant rubber magnet boot
  • Sensitivity: 88 dB
  • 1-year SonicElectronix.com warranty
Read more about the HFi12D4 at our blog.

Product history:

Hifonics HFX12D4BK thumbnail
(newest, current model)
Hifonics HFX12D4 thumbnail
(previous model, replaced by Hifonics HFX12D4BK)
Hifonics HFi12D4 thumbnail
(previous model, replaced by Hifonics HFX12D4)
Hifonics HF12D4 thumbnail
(previous model, replaced by Hifonics HFi12D4)

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Hifonics HFi12D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Hifonics HFi12D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Hifonics HFi12D4 Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Hifonics HFi12D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
Subwoofer Size
Peak Power Handling
600 watts
RMS Power Handling
300 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
88 dB
Xmax (millimeters)
11 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Injection Molded Polypropylene - IMPP
Woofer Surround
Subwoofer Grille
Re-Cone Kit Available
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Minimum Sealed Box Volume
1.25 cubic feet
Maximum Sealed Box Volume
2.15 cubic feet
Minimum Ported Box Volume
1.75 cubic feet
Maximum Ported Box Volume
2.5 cubic feet
Top-Mount Depth (Mounting Depth)
Shallow Mount Installation
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


Model Number:




Internal SKU:


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Product and How-to Videos

Customer Ratings & Reviews

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Customer Reviews

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this hifonics sub was great

Great sub for the money!

By jackie on December 6, 2011


found this helpful.

Pretty Good - Run them at 200 rms and they are fine.

I purchased one of these speakers at a liquidation, which cost me more.
I built my own box to my specs because i like bass around 20 to 35 hertz.
My box is 3.92 cubic ft with a 4 inch port, tuned it to 25 hertz. with this speaker it really pounds some those low low bass songs.

Songs used: "I'm Goin In" - Lil Wayne, "6 Foot 7 Foot" - Lil Wayne
"It's Goin Down" - Yung Joc "Blueberry Yum Yum(Chopped and Screwed) - Ludacris". Some songs from Birdman, of course "Late Night Tip" - 3 6 Mafia. "Oxycotton(Chopped and Screwed)" - Lil Wyte
"In Da Club " - 50 Cent. "Hypnotize & White Girl" - Young Jeezy

These are just a few I could remember

By Bryan on March 22, 2011


found this helpful.

Best cheap sub i found for the cash

I had doubt`s about a sub this cheap. I bought 4 of them and put them in a ported box and all i can say is wow they sound awesome for the price and get pretty loud but they do have limits. I have them hooked to a hifonics brutus bxi1610d in a 2 Ohm load and if turned up to loud you can smell them but for the price there not bad but if you want ground pounding bass look to other subs but if your on a budget & just looking for something to get by with there worth the cash....

By Mr.Bird on June 15, 2010


found this helpful.

Best Bang For Your Buck!!

For the price, I dont feel you can beat this speaker.
It is crisp, clear, and best of all, HITS HARD IN A PORTED BOX.
I built the box to Hifonics specs with the proper volume and port size, and I am very happy with its performance. I have delt with many high end, high dollar woofers and Im just amazed at this little cheap guy.
I am giving it roughly 600watts RMS and 1000Watts peak with no distortion, just clean hard bass. I was unsure about giving it this much power, but it handles it very well. Its all about the box and amp. Dont skimp on a box, get the proper volume and port size and this sub will impress you. Bass, I love You plays amazing and this woofer can MOVE SOME AIR. Thats all I have to say.

By Swanks on March 22, 2011


found this helpful.

Great Value

I own 2 of these, with a sony 1600 watt mono amp. They are a great buy for anybody wanting good sound with a low budget.

By Kevin on February 6, 2011


found this helpful.

eh not to good :/

i hooked 2 of these up and ran them at 300 watts rms each and the second day of playing them they started to bottom out on a few songs and they almost blew :/ but on low volume these really compliment the music but if your looking for low and loud bass these wont do the job as well as others

By jon on November 12, 2010


found this helpful.

good price

These are good speakers. For the money. I like them I would recommend them to somebody else.

By goofy on March 28, 2011


found this helpful.

greatt sub veryy satisfiedd!

This is a great deal for the price I got two hooked up to a 800 watt kenwood amp giving 230 rms to each sub and its beating up my trunk like you wouldnt believe people even been askin me if they were two 15"s!! I think there loud and meet most peoples expectations, imo great buy you wont be disappointed..planning on buying two more in the future and a bigger amp but for now im defenetly loud with these

By chris on November 6, 2010


found this helpful.

I love em

These subs far exceeded my expectations for how much I paid for them. I have these in a fat ported box in my Civic with a Boss GT1500D. All it does is rattle everything and make everyone laugh. Unfortunately, the frequency response isn't quite up there with Kicker or other top brands. They quiver a bit in hi-bass, the mid-bass in these are great, but they kinda bottom out when it comes to low-bass. Surely, they earthquake on low-bass but its just not quite up there with other subs. But all in all, they are still a definite GO for how much they cost. So buy em =]

By KyL on June 8, 2010


found this helpful.


I have 4 hifonic 12d4 on a planet audio 1600 u can here it a mile looking far a hifonics 2600 watt amp

By frank lane on May 6, 2011


found this helpful.


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