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MTX Audio JackHammer JH4512-04

500W Max, 12" Single 4 ohm Jack Hammer JH45 Series Subwoofer

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MTX Audio JackHammer JH4512-04

500W Max, 12" Single 4 ohm Jack Hammer JH45 Series Subwoofer

$64.99

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Authorized MTX Dealer
When you put the name JackHammer on any subwoofer, you've got a reputation to protect. Designed and engineered in the U.S.A., JackHammer subwoofers are made of high quality materials and are packed with features that put other subwoofers to shame.

The JackHammer series are loaded with features that make them rock. Both models feature rubber surrounds that are stitched directly to the cone for durability and have voice coils that are wound with "High Temperature" wire to ensure that your JackHammer subs will keep pounding the streets as long as you want them to. Both levels also feature MTX's proprietary Spider Plateau Venting technology which helps push hot air out of the voice coil and bring cool air in, adding to the reliability of the subwoofer and keeping it cool even in the hottest cars. JackHammer series subwoofers also feature the Asymmetrical Linear Drive System that is featured on other MTX subwoofers which combines a flat progressive spider with an extended pole piece to reproduce smooth, linear motion for incredibly crisp, clean sound.

The JH45 subwoofers have a silver stamped basked, rubber magnet cover and a industrial-looking "riveted" dust cap design.

  • 12" JackHammer 45 Round Series Subwoofer
  • Power Handling:
    • Peak: 500 watts
    • RMS: 250 watts
  • Impedance: Single 4 Ohm
  • Polypropylene woofer cone
  • Rubber surround
  • Stitched Cone for added durability and style
  • Precision Stamped Basket for greater structural integrity
  • FEA optimized roll geometry to maximize excursion without sacrificing cone surface area
  • ALDS Asymmetrical Linear Drive System with a flat progressive spider and extended pole piece for smooth, linear, piston like drive
  • Industry leading thermal power handling using "High Temperature" Voice Coil Wire
  • Industry leading Spider Plateau Venting cooling system cools at the voice coil
  • 1-3/4" Single voice coil
  • 70oz. Magnet structure
  • Frequency response: 31-150 Hz
  • Sensitivity: 86.7 dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
For more info, read about the JH4512-04 in our blog.

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
12"
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
500 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
250 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Single
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
31 - 150 Hz
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
86.7 dB
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Silver
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Polypropylene
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Rubber
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
No
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.
No

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Sealed
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.25 cubic feet
Optimum Sealed Box Volume
This value indicates the ideal sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.25 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.0 cubic feet
Optimum Ported Box Volume
This value indicates the ideal ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.0 cubic feet
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
6-15/16"
Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
11-1/16"
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

No

Electromechanical Parameters

Free-Air Resonance (Fs)
The free-air resonance frequency of the subwoofer, measured in Hz. At this frequency the weight of the moving parts is perfectly balanced with the subwoofers suspension system.
Equivalent Compliance (Vas)
This is the amount of air that has the same stiffness as the subwoofers suspension. The greater the rating, the lower the stiffness and larger recommended enclosure. It is measured in Liters.
Total Speaker Q Value (Qts)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including all dimensionless losses. Essentially, a high Qts value (closer to 1.0) means the subwoofer is great for sealed enclosures and a low Qts value (closer to 0) means the woofer is great in vented enclosures. A Qts of around 0.45 means the woofer will work decently in either enclosure type.
Electrical Q Value (Qes)
The subwoofers relative damping (Q) at the resonance frequency (Fs), including electrical losses. Also called the mechanical damping of the subwoofer. The unitless measurement usually varies from 0.5 – 10.
Electrical Resistance of Voice Coil (Re)
Amount of DC resistance of the subwoofer when measured with an ohm meter. Typically, this will read less than the impedance rating of the subwoofer.
Mechanical Q Value (Qms)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including mechanical losses. Also called the mechanical damping of the subwoofer. This unitless measurement usually varies from 0.5 – 10.
Efficiency Bandwidth Product (EBP)
This number represents the trade off between having an efficient woofer and one with a wide bandwidth. To calculate this number, take the Fs and divide it by the Qes. If the number is below 50, the woofer is designed for a sealed enclosure only. If it's between 50-100 it can be used in either. Lastly, if it's greater than 100 it's designed for vented enclosures.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
62%
4 Star
38%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
4.8
Features
4.2
Design
4.7
Usability
4.8
Smut

moultrie, GA

Overall
Durability
Value
Features
Design
Usability
EHhhh

December 12, 2010

It is a great sub, but my amp didnt like it. Thats probably my fault though. I would recommend buying it but only if your amp won't over power it.

5 of 6 found this helpful

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Luke

Minneapolis, MN

Overall
Durability
Value
Features
Design
Usability
Very Nice

January 6, 2010

I like these subs. My friend had two of these in a sealed box hooked up to about 500 watts and they pounded. Definitely hurts the ears when the windows are down lol. You can really feel these in your chest too. They were pretty clean and just flat out hit hard. I recommend these subs for sure. Come on, Its MTX!

5 of 6 found this helpful

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FoxTrot

middletown ohio

Overall
Durability
Value
Features
Design
Usability
Amazing

May 1, 2009

I would strongly recommend these i have 2 in 2 sealed truck boxes in my 89 ranger with a 220w amp and it bounds the hell out of it

5 of 6 found this helpful

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evan

Tacoma, WA

Overall
Durability
Value
Features
Design
Usability
Great

December 15, 2008

Its a great sub. it sounds awesome and its the best one for the price. i think. mine is really clear up to like 150 to 200 ft away and put on a 300 rms amp.

5 of 6 found this helpful

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NATAS

Franklinville, NJ

Overall
Durability
Value
Features
Design
Usability
great bass for a low price

November 25, 2010

I have 2 JH4512-04's in a custom box I built behind the back seat of my 04 Chevy Silverado 1500 4 dr truck. I powered them with a MTX RoadThunder 4160 amp that is 15 yrs old. These are the best sounding speakers and have the best bass out of all the different kinds I've owned over the years. I highly recommend these subs.

4 of 5 found this helpful

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thisguy

Indianapolis, IN

Overall
Durability
Value
Features
Design
Usability
nice

June 1, 2010

I have two of these. only giving them 500watts and they slam the SUV so hard. Doesn't take a lot of power for them to slam.

4 of 5 found this helpful

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Spencer

Rougemont, NC

Overall
Durability
Value
Features
Design
Usability
Pure Quality

May 17, 2010

I use to mess around, buying the cheap a** products, but then I sacked up and bought this MTX sub and it really paid off. Great product, good warranty and hasn't failed me yet. I plan on buying one more soon. Hits good with 200 watt Rockford Fosgate. Plan on getting a 500 watt Rockford Fosgate amp from Sonic too..

bottom line.. GREAT DEAL and clean look

4 of 5 found this helpful

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nicholas

Wichita, KS

Overall
Durability
Value
Features
Design
Usability
great product

March 9, 2010

i have two of these and they sound great and hit hard powered by the right amp i would get this again

4 of 5 found this helpful

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Will

San Francisco, CA

Overall
Durability
Value
Features
Design
Usability
pretty good subs

October 1, 2009

i've had these subs for a little less than 2 years now and they are still bangin! great quality, very durable and hits clear with the correct powering. for the price its great. i have two in a sealed box, low lows are a little weak but they compensate with a good punch. recommendable

4 of 5 found this helpful

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Jay

Michigan

Overall
Durability
Value
Features
Design
Usability
good sub

September 12, 2009

These are really good subs I had two of them in a ported box with 1200watt mono amp, I had them for about a year and i was pushing 300watts to them then trying to see if i could get more i put 400watts for about 15 mins and finally they blew -_- .But overall great subs.

4 of 5 found this helpful

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Eli

Flint, MI

Overall
Durability
Value
Features
Design
Usability
My first pair

March 17, 2009

I would recommend these subs to anyone who wants to bump a bit. I've had these subs for almost a year, and still no problems. I have them wired to a 1000w Autotek amp. Am still not to good w/ ohms, but they're not bridged and they both sound amazing. For the price, it is the most reasonable that I've seen so far.

4 of 5 found this helpful

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Brandon

Independence, MO

Overall
Durability
Value
Features
Design
Usability
good buy

January 9, 2009

I bought a MTX enclosure with 2 of these in it, it was a undivided ported box (mono), I put them in a divided/sealed box (about 1.3-1.6 cu ft.) and they're a lot better that way, I've owned them for over a year and no problems so far.
They sound good with rap/rock

4 of 5 found this helpful

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Renz

SylVania, Ga

Overall
Durability
Value
Features
Design
Usability
Great Subs

March 10, 2012

I have 2 of these subs in an 00 Towncar with a big ported box. I have a 1000 watt Elf Audio amp pushing them. They hit hard as hell in that big car. The amp is under 50% with the speakers unbridge. GREAT SUBWOOFER.

3 of 4 found this helpful

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $37.85

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

Stinger Sound Dampening Trunk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for your whole trunk!

Your Price $64.99

Dynamat Sound Dampening Trunk Kit

Did you know sound dampening will reduce those annoying rattles and even increase your SPL?

Your Price $94.95

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $18.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

Continuous working lock allows you to work without holding down trigger.

Your Price $74.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $7.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $8.99

Spring Post Terminal Cup

Makes adding a spring post terminal to an enclosure simple! Banana clip ready!

Your Price $3.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $1.99

Universal 12" Subwoofer Grille

Keep your subwoofer safe from accidental damages with this amazing grill.

Your Price $19.95

Universal 12" Subwoofer Grille

Keep your subwoofer safe from accidental damages with this amazing grill.

Your Price $19.95

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

1 MTX Audio JackHammer JH4512-04 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 MTX Audio JackHammer JH4512-04 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

3 MTX Audio JackHammer JH4512-04 Subwoofers

4 Channel Amp

4 MTX Audio JackHammer JH4512-04 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary

Manufacturer

Model Number

JH4512-04

UPC

715442351626

Weight

10.00lbs

Internal SKU

jh451204

Internal Product ID

14787

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: MTX Audio JackHammer JH4512-04