Expert Service 1-877-289-7664 [Hours]

Boston Acoustics SPG555-2

13" Single 2 ohm Oval SPG Series Car Subwoofer


We apologize

This item has been discontinued

Get FAST answers from customers ASK a Question See questions answers


This is the word carefully chosen by Boston Acoustics to described the SPG555 reference subwoofer. With its neodymium structure, the powerful subwoofer is a lot lighter than its closest subwoofers of similar designs. Boston Acoustics unique Removable Voice Coil (RVC™) system and Soft Part System (SPS™) help make this subwoofer an advanced and powerful subwoofer. The oval design is made to push more air in a more effective manner. The SPG555 sub also works in enclosures with a volume as small a 1 cubic foot! This is truly a revolutionary subwoofer with a Boston Acoustics reputation.

Product Specifications:
  • 13" Single 2 ohm SPG Series Oval Subwoofer
  • Power Handling:
    • RMS: 1000 watts
  • Impedance: Single 2 Ohm
  • Polypropylene cone woofer
  • Foam woofer surround
  • RadialVent® cooling directs airflow around the voice coil for increased power handling
  • RVC™ (Removable Voice Coil) allows coil to be exchanged without removing the woofer from the enclosure
  • SPS™ (Soft Part System) technology allows for cone assembly removal
  • SPG555 can be field-stripped and custom painted, powder-coated, or plated for a custom look
  • Simplified mounting with the integral sealing gaskets
  • 3-1/2" Voice coil
  • 3-3/4" peak to peak excursion for devastatingly accurate, deep bass output from small sealed enclosures
  • 555 cm2 of surface area
  • Compatible with the SPG-TR passive radiator
  • Frequency response: 20-350 Hz
  • Sensitivity: 91.0dB
  • Xmax: 22mm
  • Mounting Depth: 8-1/4"
  • Cutout Dimensions: 13-3/16" x 10-7/16"
  • 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.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
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.
1000 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.
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.
2 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).
20 - 350 Hz
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".
91.0 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.
22 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.

Main Cone Color
This is the color of the speaker's or subwoofer's cone.
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.
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.
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.
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.
Yes (Accessory available and sold separately)

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
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.
1.0 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.
1.0 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.
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.
2.6 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.
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.
13-3/16" x 10-7/16""
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.


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

Promotions we have offer More Ways to Shop for items that are on clearance, last chance, special offer and sales, Made in America, and more!

Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Salt Lake City, UT

Damaged my ears!

October 21, 2011

This sub can be found for $350. I bought mine with the 1 f^3 factory sealed enclosure, then cut an oval out of the back (opposite the driver) and installed the passive radiator (free +3db with dummy cone) tuned to 30hz (with supplied weights). I am powering it with an MTX 81000-D, birth sheet says 1308 watts rms into my subs 2ohm load. I have read the SPG can take 1800 watts rms. I don't doubt this, as I am shopping for a bigger amp now. I have the gain set for 51 volts at my max volume, which shows no clipping on my oscilloscope and equals 1300 watts on my 2 ohm Boston. Have not melted the coil at max volume yet. Max temp of the plastic on the outer ring of the outside of the voice coil (its perimeter) I have measured with a laser no contact thermometer is 212 F. It did not fail at that temp. I did melt the coil once with the same amp, but gain was set too high on a road trip (6hrs of Tech 9 and Mike Jones) and it was clipping the signal. I did not have and oscilloscope or volt meter (51v rms ='s 1300w) to set the gain on the road. The replacement surround and voice coil just keeps getting louder, and runs cooler. It has been about 2 months of listening at full volume Bass Mekaniks and still the spider is getting looser and the sub getting louder, and now runs at about 98F after HARD hitting tracks. I also blew the surround out once when my girl opened my truck at full volume, thus unloading the driver and allowing over excursion (stretching the foam surround excessively). Evidence it is getting louder: volume 24 was max voltage for the amp and listenable. Now, volume 18 hurts my ears. My left ear is ringing and popping during the day, and my girl friend says both her ears are waxing more and damaged. Also, the whole car is shaking now, window, seats, dash, sodas in the console. Also, DVD navigation disc in the trunk just skipped and wouldn't operate for the first time the other day. This sub was made to conquer the 13W7 (and I read it did), Boston is way underrated, and audiophile grade. That is why I bought this, is does not distort a note, and shakes my whole car, all for 1 cubic foot! The only other sub that could come close for 1 cubic foot per sub would be Premier SPL sub. Recommended 1.5 f^3 per 12". So, 2 x 12= 3 Premier SPL. Also, equals 3 SPG + 3 passive radiators, total, 3 cubic ft. Although, the RE XXX does recommend max of 1.1 cubic ft sealed for their 12", and JBL MKII 12" recommends 1 cubic ft for sealed 12. Can somebody produce a louder sub in 1 cubic ft that Boston with the SPG 555 teamed with the passive radiator (which increases output by 3db but doesn't affect box volume)?

12 of 21 found this helpful

Was this review helpful to you?



Get this sub

January 20, 2009

This sub hits low and hard. If you don't have much room get this; it is a very high quality product.

10 of 17 found this helpful

Was this review helpful to you?



Great sub

March 23, 2010

Just for your info this sub can handle anywhere from 100-1000rms...and it is light weight. I have it hooked up to the rear channel of a T8004, I'm giving around 600rms to it, in a sealed enclosure and i have to say i love the way it sounds. For simple use this sub will be more then enough if you have around 500-600rms. This sub only has pros in my book with only two cons, first it only has a single voice coil, 2 or a 4, but that is almost not a con for you can switch out the voice coils at any time with ease. Second you have to either make a sealed box yourself, i think this site has a ported, or convert a one cubic foot box into an oval shape.

On another note i have not tried to max this thing out to see how loud i can get it for that isn't what I'm using it for. I use this for quality sound and i am impressed with it, though if i were to put it in a ported i doubt i would be able to hear for long for its already loud as is. For those of you debating on getting a cheaper sub i would give the cash for this one any day for i was debating on going cheaper and I'm sure glad i didn't. This is one nice sounding sub.

7 of 12 found this helpful

Was this review helpful to you?



wow is not enough

August 22, 2012

Ok so here is what I had, JL 10w7 and a 500/1v2 now I have a spg555-2 and a Rockford fosgate t15000-1bdcp. And it smokes the jl in every way. Sq and spl are not even close, the Boston wins hands down. I have my sub in the SQ box that Boston gives specs on in the owners manual. Its tight, fast and stupid deep bass. I can say I was on the fence when I sold my W7 and now I laugh. Half the price and twice the output. This sub is like 92db you don't need any power at all to run it. I love it will never give it up.

7 of 14 found this helpful

Was this review helpful to you?



Absolutely the best

May 19, 2012

Just hooked this monster up today and WOW!!! crisp and clean bass. sounds amazing. by far the best subwoofer I have ever owned.

7 of 15 found this helpful

Was this review helpful to you?


Denver, Colorado

Boston SPG555-2

November 16, 2012

So i bought this from Sonic and the first sub I received looked like it had been used or an open box. I called Sonic and worked it out and they sent me out a new one. Seems to be much better condition (new). I have owned many many subs from JL Audio, Rockford Fosgate and so on. I had a Rockford T1 12 that sounded very good but i wanted just a little bit more boom. I read many reviews on this sub and decided to go with it. I got lucky and bought the Ported/Vented Subwoofer Enclosure from a buddy of mine for a very good price.

This sub really makes some good BASS. I have to say WOW
I am using a Rockford T1500-1bd amp with plenty of power. Musically the sub performs very well and when you want to make this sub hit it has no problem doing it. I am considering buying a second one from Sonic. If you are reading this i would say go for it.

7 of 16 found this helpful

Was this review helpful to you?


Atlanta, GA

Amazing sound quality.

January 11, 2013

After learining about passive radiator setups, I sold my two 12" Type-R's and decided to replace them with this one sub, backed with its counterpart, the SPG-TR. I built the box to specs recommended in the owner's manual, and I couldn't be happier with it. I have yet to hear the 30 hz or the 45 hz setup, but the 35 hz setting has pleased me thus far. The low end really booms, while maintaing a smooth transfer into the higher notes. Its really amazing how low the little 1 cubic foot box can hit. If your looking for truly flat response, you might look elsewhere; it really spikes around the tuning frequency of the passive radiator. For anyone looking to save some space and still have a strong low end with great sound quality, it cant be beat. I got my trunk back and can tell little difference in volume level. Running it off a Rockford T1000BDCP which puts out around 1200 watts at 1.6 ohms (which this sub is). Very pleased with my decision.

6 of 16 found this helpful

Was this review helpful to you?

Accessory Tools and Products

Accessories added

NVX 20 ft. of True Spec 8 Gauge Speaker Wire

Flexible multi-strand cable bends and twists to meet your installation needs.

Your Price $49.99

25 ft. of Streetwires 12 Gauge Speaker Cable

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

Your Price $44.95

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

40 Square Feet of Sound Dampening Material

Thicker than the competition, complete sound damping kit for entire vehicle! Use for trunk, doors, roof and floor.

Your Price $119.99

Dynamat Sound Dampening Bulk Kit

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

Your Price $159.99

Stinger Sound Dampening Bulk Kit

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

Your Price $99.99

12 oz. Can of Adhesive Spray

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

Your Price $6.99

Gold Plated Dual Terminal Banana Plug Connector

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

Your Price $1.99

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

Car Stereo and Speaker Installation Tool Kit

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

Your Price $16.99

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

1mm All Purpose Solder

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

Your Price $8.99

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

1 Boston Acoustics SPG555-2 Subwoofer

Mono Amp

2 Boston Acoustics SPG555-2 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

3 Boston Acoustics SPG555-2 Subwoofers

4 Channel Amp

4 Boston Acoustics SPG555-2 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp

Hide answersShow all answers | Sort by
No questions have been asked about this item. Be the first!

Product Summary


Model Number




Internal SKU


Internal Product ID


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 SPG555-2