Hifonics HFX12D4

12" HF Series Dual 4 ohm Subwoofer (400W RMS)

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• 800W Max / 400W RMS
• Injected Poly Light Rigid Cone
• 1" NBR Reinforced Rubber Surround
• One Piece Poly Cotton Spider
• Spade Style Speaker Terminals
• Chrome Stamped Steel Basket

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Product Highlights

• 800W Max / 400W RMS
• Injected Poly Light Rigid Cone
• 1" NBR Reinforced Rubber Surround
• One Piece Poly Cotton Spider
• Spade Style Speaker Terminals
• Chrome Stamped Steel Basket


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Hifonics 12" HF Series Car Subwoofer

Sonic Electronix is now carrying the Hifonics HF Series Car Audio Subwoofers. The HF Series 12" Subwoofer has a peak power rating of 800 watts and a RMS rating of 400 watts. This sub will produce some ground shaking bass and is constructed with a injected poly light rigid cone and a 1" NBR reinforced rubber surround for enhanced excursion. This woofer is also equipped with a dual 4 ohm voice coil and a large air cooled magnet assembly. Add some bumps in your trunk and enhance your cars stereo system with this Hifonics HF Series Subwoofer.

Product Features

  • 12" HF Series Car Subwoofer
  • Power Handling:
    • Peak: 800 watts
    • RMS: 400 watts
  • Recommended Power Range: 200 - 400 Watts RMS
  • Impedance: Dual 4 ohm
  • Injected poly light rigid cone for excellent durability
  • 1" NBR reinforced rubber surround provides large amounts of excursion
  • Integrated one piece poly cotton spider
  • Spade style speaker terminals
  • Poly light dust cap
  • Heat dispersing ported back plate
  • Ultra ridged chrome stamped steel basket
  • High strength ABS motor cover
  • Operates In sealed & ported enclosures
  • DVC 4 ohm high-temp KSV voice coils
  • Large air cooled magnet assembly
  • Sensitivity: 87.25 dB
  • Xmax: 6.5 mm
  • Mounting Depth: 5-5/8"
  • Mounting Diameter: 10-15/16"
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

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 HFX12D4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Hifonics HFX12D4 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Hifonics HFX12D4 Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Hifonics HFX12D4 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
HF Series
Subwoofer Size
Peak Power Handling
800 watts
RMS Power Handling
400 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Frequency Response
Not specified by manufacturer
87.25 dB
Xmax (millimeters)
6.5 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Injected poly light rigid
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
1.25 cubic feet
Minimum Ported Box Volume
1.6 cubic feet
Maximum Ported Box Volume
2.0 cubic feet
Top-Mount Depth (Mounting Depth)
Cutout Diameter
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:


Internal Product ID:


Product and How-to Videos

  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?

Customer Ratings & Reviews

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Customer Reviews

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Keeps blowing me away more and more!

This sub just keeps hitting harder and lower! I'm amazed and blown away! I was underwhelmed for a while there because I realized that I actually killed my previous sub by sending a very strong and very clipped signal to it by having the gain set too high for my head unit's preamp voltage. To reach the ~250W RMS the amp is rated for with my head unit, I need the gain knob LESS than half way up. Any more than that and it starts distorting, and this is not because of the sub but because I'M SENDING A CLIPPED SIGNAL FROM MY AMP. I feel like I've officially made that step from n00b to experienced installer. I had read all the instructions and guides before and never understood what they meant by matching the head unit's preamp voltage. Now I do and I know how not to kill a sub (and/or amp, for that matter).

Anyway, I had never broken in a sub and this sub is STILL blowing me away! It's hitting harder and it does better throughout the entire range. The lower notes (centered in the mid to high 30Hz range) I could barely feel at the start are now making the car have a slow, deep vibration when they hit (remember it's a sealed box). Being a 400W sub I feel like playing it full-blast at 250W RMS is good enough as 'breaking it in' and it is just finally beginning to impress me. It's hitting almost as hard as the Memphis sub that was getting a clipped signal with a few extra watts to compensate for my bass-trap trunk (thick leather seats, kills any bass trying to come from right behind you). Right now I'm keeping my rear seat's backrest down so I can feel the full effect of the sub.

I just can't wait to give it 400W. OMG. What a great sub. If 'you get what you pay for' is true 99% of the time, the HFX12D4 is the 1%, by far!

By Ricky Shade on November 6, 2011


found this helpful.

Just purchased

I just bought this, and installed it in my 2000 accord. Don't be fooled by the price, this thing kicks. I hooked it up to my Pioneer GM-5500T amp putting out around 400 watts RMS. This sub sounds great so far.

By Connor on July 22, 2014


found this helpful.

Very powerful, ,,

Was hesitate to buy this,, glad I did hook up to a mofo 12, and re 10, I have 1/0 gauge from battery to cap then 4 gauge to amp,, I love it,, lights still go dim,, need extra battery it love power,, removed my crossfire xp1400d,, this is way better,,,,

By fisher on September 24, 2014


found this helpful.

Nice sub

Sounds looks and is a great sub. Best for the money.

By Logan on December 30, 2011


found this helpful.

Hifonics HFX1204

These subwoofers really hit hard for the price. Probably one of the best I have ever bought. We'll see how long they last.

By Ryan on December 23, 2014


found this helpful.

Great product

I've had these subs two of them hooked up to a crunch 1500 powerzone amp in a sealed box and they bump!! I've had them for two weeks and still working great! I had a previous set of subwoofers that hit great lows and I'd say that these subs don't hit great lows but they hit really crisp mids and highs :) I love them either way at great price I don't mind I'll probably get a third 12 that mainly hits great lows to even out :)

By Roberto on November 5, 2014


found this helpful.

Good entry level sub

Good sub for moderate power systems. Doesn't like peak power tho. Went thro 2 of them with 750 watts max. If your going to dump some power into your system (+1000 wats), subs are not the place to save some $$.

By Hijinx on December 15, 2014


found this helpful.


Great Subs.Love Hifonics,you can never go wrong with them.And Sonic Electronix,I Salute on superb services.Thanks!

By Jermaine on October 9, 2014


found this helpful.


They actually sound good yet they're so inexpensive. I'm only using a 520 RMS amp and they bump, I can hear them from inside my house. A must if you're looking for some bang with out going broke.

By suicide_doorz on March 23, 2014


found this helpful.

love these subs...

I bought two of these and I installed them in my Honda Civic. Have them wired at 4 ohms and they rock my little Honda. I don't even have them in a ported box. I've had them for a month. The only downside are the wiring terminals.

By dave on March 28, 2014


found this helpful.


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