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Boston Acoustics G215-4

15" Single 4 ohm G2 Series Car Subwoofer

Discontinued
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This item has been discontinued

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The G2 Boston Acoustics Experience

G215-4 subwoofers are the best solution when looking for a factory replacement subwoower that will provide, clean, crisp, and quality bass for any car audio system. So if you are looking to replace your busted factory sub or just want to add some bass to your vehicle these woofers are a great option.

Boston Acoustics has built from their previous subwoofer to bring you their new G2 series subwoofers. These subwoofer are not only an improvement but stay true to the quality and performance that comes with Boston Acoustics products. Available in a 10", 12", and 15" size woofer along with the option of either a single 4 ohm voice coil or dual 4 ohm voice coil for multiple wiring options that better suits your personal needs. All G2 series subwoofers are equipped with Boston Acoustics specific technologies such as SureSet™ impedance selection that makes wiring easy and accurate as well as adds protection from overdrive to the voice-coil. G2 subs also feature a RadialVent® cooling system that decreases heat dissipation as well as distortion cause by thermal discharge. This improves the subwoofer's ability to perform at higher power handling levels while still producing quality bass output. All G2 series subwoofers feature a co-polymer woofer cone and foam surround for rigidity and increased excursion. So if you are looking for a subwoofer that can deliver deep bass, high sensitivity and long excursion, then the G2 series subwoofers are the perfect match at a competitive price.

  • 15" Single 4 Ohm G2 Series Subwoofer
  • Power Handling:
    • RMS: 300 watts
  • Impedance: Single 4 Ohm
  • Co-polymer woofer cone
  • Foam woofer surround
  • SureSet™ impedance selection provides simple impedance selection as well as overdrive protection
  • Rigid cast aluminum chassis
  • RadialVent® cooling directs airflow around the voice coil for increased power handling
  • 2-1/4" 4-Layer Voice Coils
  • 2" peak to peak excursion for devastatingly accurate, deep bass output from small sealed enclosures
  • Rugged input terminals accept bare 8 gauge wire or pin connectors
  • Integral sealing gaskets ensure tight seals for any mounting configuration
  • SPL Sensitivity: 90.2dB
  • Xmax: 12.5mm
  • Frequency response: 18-350 Hz
  • Mounting Depth: 7-1/16"
  • Cutout Dimensions: 13-15/16"
  • 1-year Manufacturer's warranty

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
G2 (Boston Acoustics)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
15"
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.
300 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).
18 - 350 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".
90.2 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
12.5 mm
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.
Black
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.
Copolymer
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.
Foam
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.
2.0 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.
2.0 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.
3.50 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.
3.50 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.
7-1/16"
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.
13-15/16"
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
67%
4 Star
33%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
5.0
Features
4.7
Design
4.8
Usability
4.2
James

Le Roy, MN

Overall
Durability
Value
Features
Design
Usability
Sweet Deal

September 10, 2013

Sad to see Boston stop car audio. Is great woofer.I did 3 in a wall in my ram. Excellent sound quality!

0 of 0 found this helpful

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Corey

Mn

Overall
Durability
Value
Features
Design
Usability
I liked it

February 19, 2013

I bought this sub off here and it shipped fast (as usual) great deal. I found that it is really easy to blow the fuses though. I have g1's and don't blow fuses on those. But if you have it wired to under 200 it still really pounds. Good in a large 3 cubic foot ported box .

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anvil

leroy

Overall
Durability
Value
Features
Design
Usability
quality sound awesome value

February 5, 2013

I did 3 Boston g2 15 s in my dodge RAM. Excellent mix of spl and sq . Been installing for 20 years now. I am sad to see Boston leave the car audio market . I've been a fan since beginning. I guess plastic parts and shinny prices are more important that good speakers :(

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Dr. House

NOLA

Overall
Durability
Value
Features
Design
Usability
Why would you not buy this?

October 7, 2012

Ok, these are simple, require very little power, high sound quality I cannot think why you would not buy this sub. Boston knowledge behind sound.

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carter1010

Indian Trail, NC

Overall
Durability
Value
Features
Design
Usability
Outstanding Subwoofer

August 30, 2012

I decided to purchase a pair of these subs due to the fact that while on clearance, they were one of the most inexpensive 15" subwoofers I recall coming across from a reputable company. I had read a review on a forum that was very negative that almost detoured me from purchasing. Having used several Boston subs, I found this surprising. The claim was that the woofer did not perform well in a 1.5 cu ft box. Upon receiving the woofers, I did in fact install them in a 1.5 cu ft / sealed sub enclosure. The review was accurate. The subs lacked low end and needed a ton of power to get loud. The subs also do require a break in period. They got better after about 4 hours of play, but still pretty lackluster all in all. I was not sure that half a cubic foot per chamber would make much of a difference. Even looking at my enclosure design software, it showed little difference. Regardless I decided to build a new sealed box anyways. The subs are running off a Rockford Power series 1000.1bdcp. In a 2 cu ft enclosure, these subs get impressively loud and sound exceptional. Sound quality (my own subjective definition) at the $300 price point is well above average. The competition gets pretty elite at 300 bucks per sub. When you factor in the output available with very moderate power levels, the sub sets itself apart from almost any other driver at that price point.. They are also very efficient in the 2 cu ft / chamber sealed box and I would say a 600 watt amp is more than adequate. I dropped the low end output on my Pioneer DEX-P99 to -9db per sub from where they were at in the 1.5 cu ft sealed box. Some Products I have used in the past: JL 13w7 JL 12w7 JL 10w7 JBL W10gti JBL GTO1514d JBL GTO804 DD1508 Boston Acoustics G510 Boston Acoustics G112 Boston Acoustics G212 The boston G215 is tied for 1st with the JBL w10GTI in my opinion. The JBL is the best sound quality sub I have heard. The JBL is not very efficient and requires a ton of power to get the volume I desire. The Bostons fulfill that thirst for output while the sacrifice in sound quality is there, its well worth the trade for my setup. The only negatives are that the speaker terminals seem like they are upside down and can be tight to fit your fingers in to press depending on the length of speaker wire your dealing with. The other is that these subs want 2 cu. ft or more sealed. Many 15's on the market can work in less space, these lose a lot of performance from even a slightly smaller enclosure. The included screws have a very small head and strip easily. For these reasons 3 stars on ease of use. If you have the room for a 4 cu ft enclosure and want a pair of great sound quality subs that can bounce large items off your roof at will, these should put a smile on your face.

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parker

fargo nd

Overall
Durability
Value
Features
Design
Usability
Great woofers

July 29, 2012

Im "Anal" about my sound. When it comes to Trance, Slope Hiphop, Post-Hardcore Rock (repetitive double kicks) You need a responsive woofer. Most run over towards 10's for response but i like the Deep thump that comes from a 15" woofer cone. The G2s are made with light weight materials, perfect motor for moving air, and built phenominal. I couldve spent 2-3 hundred dollars on a woofer from some one else but why do that when Boston makes car audio? They kick hard, and thump out some serious spl from sealed enclosures. I'll probably buy another, and keep this for life..

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Accessory Tools and Products

Accessories added

15" Angled Medium Sealed Subwoofer Enclosure

CARB Compliant, 3/4" MDF Sealed Angled Enclosure Lined with Premium Carpeted Finish

Your Price $46.95

25 ft. of Streetwires 12 Gauge Speaker Cable

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

Your Price $44.95

20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

Your Price $59.99

Dynamat Sound Dampening Trunk Kit

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

Your Price $109.95

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 $69.99

12 oz. Can of Adhesive Spray

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

Your Price $6.99

Spring Post Terminal Cup

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

Your Price $3.99

40" x 15 Ft Piece of Premium Un-Backed Automotive Trim Carpet

Durable design for long life-span, available in many colors and shades.

Your Price $39.99

Gold Plated Dual Terminal Banana Plug Connector

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

Your Price $1.99

Car Stereo and Speaker Installation Tool Kit

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

Your Price $12.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

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

Your Price $79.99

4 Ft of 1/4" Thick Black Heat Shrink Tubing

Provides abrasion resistance and added protection for your cables.

Your Price $3.99

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

1mm All Purpose Solder

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

Your Price $8.99

15" Protective Waffle Metal Subwoofer Grille

Keep your subwoofer looking amazing while keeping it safe with its durable metal construction!

Your Price $6.99

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

Impedance Meter / Signal Generator

Easy to locate tuning frequencies of passive radiators and ported enclosures

Your Price $299.99

1 Boston Acoustics G215-4 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 Boston Acoustics G215-4 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

3 Boston Acoustics G215-4 Subwoofers

4 Channel Amp

4 Boston Acoustics G215-4 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

G215-4

UPC

0690283478582

Weight

18.50lbs

Internal SKU

g2154

Internal Product ID

38782

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: Boston Acoustics G215-4