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Audiofrog GB12D4

GB Series 12" dual 4-ohm subwoofer

3 Reviews

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Item # 898GB12D4

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Our take on the Audiofrog GB12D4

Audiofrog is a new company founded by seasoned veterans of the car audio world, all of whom have extensive experience as custom installers. They know the ups and downs of installing subwoofers in cars and trucks, and they know what's needed to create great bass.

A new name in bass

Audiofrog is a new company founded by seasoned veterans of the car audio world, all of whom have extensive experience as custom installers. They know the ups and downs of installing subwoofers in cars and trucks, and they know what's needed to create great bass.

Performance is the goal

Audiofrog engineered and built their GB12D4 12" subwoofer with performance in mind. It starts with a 3", four-layer voice coil made to withstand the heat generated when a sub's working hard. The cast aluminum basket uses special venting to help dissipate this heat, enabling this sub to handle up to 1000 watts RMS. Its extended low-frequency response means it can reproduce truly low notes without compromise.

A sub for small enclosures

The GB12D4 is optimized to work in compact enclosures — as small as 0.75 cubic feet for a sealed enclosure — so you can bring powerful bass into a tight space. Its high sensitivity means that your amp won't have to work so hard to bring you those thumping lows. Another nice touch from Audiofrog — an external switch lets you switch the sub's impedance from 2 to 8 ohms without rewiring.

Serious testing

Audiofrog subjects its speakers to rigorous testing, pulling random subs from the production line to check their ability to withstand abuses of heat, vibration, and power. A unique copper ring shields the mammoth 3" voice coil, minimizing the distortion found in traditional designs. It's this attention to real-world detail that makes Audiofrog subs unique, as they're designed by people who really know car audio.

To drive this single subwoofer, we recommend a mono amplifier rated between 750 and 1500 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.


  • 12" subwoofer with two 4-ohm voice coils
  • treated paper cone and dust cap
  • vented cast-aluminum basket
  • 3" voice coil with copper ring for reduced harmonic distortion and superior impact
  • impedance switch (2 to 8 ohms)
  • frequency response: 22-180 Hz
  • power handling: 100-1000 watts RMS (1500 watts peak)
  • sensitivity: 92 dB
  • top-mount depth: 6-2/3"
  • sealed box volume: 0.75-1.27 cubic feet
  • ported box volume: 1.35-2.5 cubic feet
  • grille not included
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • One 12" Dual 4-ohm voice coil subwoofer (with impedance switch)
  • Instruction manual

Audiofrog GB12D4 Reviews

Average Customer Review(s):

(3 Reviews)

Just awesome!!!

Rick from San Antonio, TX on 8/15/2018

2006 Ford F-150
Crutchfield Customer Review (What's this?)

I'm running a pair of these subs in a dual chamber sealed enclosure each one powered by a JBL GTR 1001 amp at 1000 watts @ 2ohms along with a pair of Focal K2 6.5 components powered by a Morel MPS 4.400 bridged around 130 watts x 2 (the amp can do 200x2 @4ohms bridged) and the sound is beyond wow! I can crank the radio 100% without any distortion. The subs play super low and accurate giving rich detail on all the bass notes. The best part of this sub for me is that it's not a SPL sub that claims to give all this crazy excursion and sacrifices on sound quality. Instead you get amazing sound quality with the output you get from some SPL subs! The price is up there but you honestly get what you pay for just make sure you get the proper enclosure build for them. Also if you want to protect these subs with a nice looking grille the JL Audio SGRU-12 grilles fit perfect with these subs. Everything mentioned here was purchased here at Crutchfield.

Pros: 1. Great-rich sound quality 2. Great power handling 3. Don't require a huge enclosure

Cons: Price would appear to be the only con but the pros are worth it especially if you are looking to buy high end subs like JL Audio

Audiofrog GB12D4

Crutchfield customer from Spring Valley, CA on 6/1/2018

Crutchfield Customer Review (What's this?)

Great clear sound.

Pros: SQ sub. Loud crisp clear. Very affordable for the level of performance.


Audiofrog GB12D4

Tim from Ogdensburg, NY on 3/4/2018

2005 Subaru Legacy
Crutchfield Customer Review (What's this?)

These will be matched with a full three way set of GB a la carte speakers. The sub is now installed in a sealed 3/4" MDF enclosure per the suggested volume and dimensions listed in the GB12D4 subwoofer manual. Even at low volume and energy potential on a test rig, this sub is proving just how deep it can go and it's a shame you can't see the guts while installed. One pretty piece of equipment. If you are looking for a sub with good specs and that both Crutchfield and AudioFrog will backup, then look no further. Don't be afraid to spend the money to get a sub that has both the specs and function to get you the sound you should be getting! Very versatile in terms of enclosure choices.

Pros: Build quality, specs and reputation.

Cons: None found at this time.


Hands-on research

Product Research


Dual Voice Coils: This woofer features two 4Ω voice coils, with a switch on the terminal, allowing you to easily change from parallel (the woofer presents a 2Ω load) to series (the woofer presents an 8Ω load) wiring.

Screw Terminal: The set screw terminals offer easy connection of bare wire up to 8 gauge. A 3mm Allen wrench (not included) is needed to tighten the terminals.

Sealed Box Volume: The recommended sealed box volume range is from 0.75 ft³ to 1.25 ft³, with 1.02 ft³ being the ideal size. A sealed enclosure design gives the smoothest response with increased energy at the lowest frequencies.

Ported Box Volume: The recommended ported box volume range is from 1.35 ft³ to 2.5 ft³. The ideal size is 1.5 ft³, for which both slot and tube style port measurements are given; both result in a tuning frequency of 33 Hz:

  • Slot: 12-1/2" x 1-1/2" opening, 22" long
  • Tube: 4" diameter x 16" long

Power Handling: Audiofrog lists two RMS power figures in the manual; 500 watts RMS in the technical specifications section and 100-1,000 watts RMS in the recommendations section. We've listed the recommended range in the specs table.

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