Boston Acoustics SPG555 User Manual

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Thank you for purchasing the Boston Acoustics SPG555. Designed from the ground up at our engineering and production facility in Peabody, Massachusetts, the SPG555 utilizes many innovations and industry firsts. The SPG555 features our patented-pending3.5-inchRV C(Removable Voice Coil) allowing you to either change the impedance of the subwoofer or repair a defective voice coil; without having to remove the SPG555 from its enclosure! By removing six screws, you can simply slide out the RV Cand replace it with a new one. In addition, the SPG555 features our SPS( S o f t Part System) allowing the user to replace the entire cone/surround/spider assembly should they ever become damaged.

The SPG555 incorporates a unique cone profile. The race track design allows the SPG555 to fit where other woofers cannot, giving you the ability to install the SPG555 in an area that would normally would limit you to using a 10-inchsub- w o o f e r. The area of the cone, 555cm2, is larger than a standard12-inchsubwoofer—simplyput, greater cone area for greater output. A3.5-inchdiameter voice coil combined with Boston Acoustics' patented RadialVe n t® cooling allow the SPG555 to handle an amazing 1000 watts RMS. Generally conventional high output subwoofers rely on massive magnets that dramatically increase their weight. The SPG555 uses a powerful neodymium motor structure that is significantly lighter than ferrite motor structures, keeping the total weight of the SPG555 to only 26 lbs. Like the highly acclaimed Boston Acoustics G5 line of subwoofers, the SPG555 can be completely disassembled to allow customization. You can paint,powder-coat,or chrome the SPG555's basket and heatsink to customize the appearance of the SPG555 for a custom installation.

Take a few minutes and familiarize yourself with the contents of this manual. In addition to basic set-uprequirements for the SPG555, you will also find several enclosure designs that allow you to tailor the performance of it to your specific design goals. Whether you are looking to build a vehicle for accurate reproduction or the production ofmind-blowingbass, the SPG555 is up to the task. Attributes of each enclosure are highlighted on each design page and all three designs should be considered before making a decision on which one to build as the enclosure design will radically effect the end result. Regardless of enclosure chosen, the SPG555 truly defines reference level performance.


General Specifications




Nominal SD:



RMS Power Handling:






Frequency Response (±3dB in car):




26 Lbs.

26 Lbs.

SPG555 Thiele-SmallParameters






Fs (Hz):



Re (Ohms):

3 . 1 5

1 . 6 8










Vas (Liters):



Mms (Grams):



Cms (µM/Newton):



Xmax (Mm):



Xmech (Mm):



Sd (CM 2):



Bl (Tesla-M):

14 . 27

11 . 58

SPL Eff (dB @ 1w/1m):



SPL Sen (dB @ 2.83v):

8 7 . 7

9 1 . 0


Side View


Top View

Subwoofer Parts


(Soft Part System)

Mounting Gasket

SPG555 Basket, Motor

Structure, and Heat Sink


RVC(Removable Voice Coil)


















Mounting Screw

Long SPSScrew

Short SPSScrew


x 10


x 6

x 8


x 6

Enclosure Designs

Sealed Enclosure

Sealed Enclosure Explanation

A sealed enclosure is the best option if sound quality is of primary concern. It will offer the best overall response across the low frequency audio spectrum, great transient response, and will allow for the most seamless integration between the subwoofer system and front speakers. It is also half the size of the sound quality ported design minimizing the space that needs to be dedicated to the subwoofer enclosure.

Sealed Enclosure Specifications

Recommended Enclosure Volume*:

1.0 ft3 (28.3L)

Q-Tune™† (Highpass and Q Setting):

25Hz @ 0.707

Sealed Enclosure Example


Gross Volume:

1.0 ft3 (28.3L)


Internal Height (H):

10 12" (26.7cm)


Internal Width (W):

13" (33.0cm)


Internal Depth (D):

13" (33.0cm)


General Information for both Sealed and Ported Designs

*All enclosure dimensions are internal and include basket and port displacement

The above enclosure shape is an example and these dimensions can be modified provided that the exact internal volume is retained

34-inchthick M.D.F. is recommended as a minimum

Q-Tune is a feature found on Boston GT Amplifiers

Sound Quality Ported Enclosure

Sound Quality Ported Enclosure Explanation

The use of low tuning allows the SPG555 to deliver much stronger low bass energy when compared to the sealed enclosure. Use of a smaller volume combined with low tuning allows the ported sound quality enclosure to produce a relatively flat response down to 30Hz while delivering solid impact at high output levels.

Sound Quality Ported Enclosure Specifications

Recommended Enclosure Volume*:

2.1 ft3 (59.4L)

Tuning Frequency:


Q-Tune™† (Highpass and Q Setting):

31Hz @ 0.9

Sound Quality Ported Enclosure Example

Gross Volume:

2.1 ft3 (59.4L)

Internal Height (H):

14" (35.6cm)

Internal Width (W):

18" (45.7cm)

Internal Depth (D):

14" (35.6cm)

Slot Port Opening:

1 14 x 14” (3.2 x 35.6cm)

Port Length:

22” (55.9cm)

Note: If a rectangle port cannot be used, two 3” (77mm) round ports, 16” (406mm) long may be substituted.

High Output Ported Enclosure

High Output Ported Enclosure Explanation

As the name suggests, the high output ported enclosure will play the loudest of the three designs. Its large internal volume combined with large port area delivers great efficiency for very high output. Tu n i n g is higher than the Sound quality enclosure bringing the peak efficiency point of the enclosure much closer to average vehicle resonance but is still tuned low enough for good musical reproduction.

High Output Ported Enclosure Specifications

Recommended Enclosure Volume*:

2.5 ft3 (70.8L)

Tuning Frequency:


Q-Tune™†:(Highpass and Q Setting)

36Hz @ 1.2

High Output Ported Enclosure Example

Gross Volume:

2.5 ft3 (70.8L)

Internal Height (H):

14" (35.6cm)

Internal Width (W):

22" (55.9cm)

Internal Depth (D):

14" (36.8cm)

Slot Port Opening (PW): 1 34 x 14” (4.5 x 35.5cm)

Port Length (PL):

19” (48.3cm)

Note: If a rectangle port cannot be used, two 3” (77mm)

round ports, 10” (254mm) long may be substituted.

RVC(Removable Voice Coil)

Removable Voice Coil

The SPG555 is the first woofer ever that allows the voice coil to be exchanged without having to remove the woofer from the enclosure. This unique feature allows you to change the impedance of the woofer or repair a damaged voice coil, not just easily, but quickly.

Removing The RVC

1)The RV Cis held in place with six screws. Using the provided tool (2.5mm allen hex), remove the six screws around the outside of the RV C.

2)Once the screws are removed, pull up on the handle and the RV Cwill slide out.

 

Note: If the previous RVCwas damaged, make sure that the gap is clear of all debris before installing the new RVC.

Installing The RVC


Installing The Handle

1)Install the new gasket (provided) on to the RV C


2)Align the notches on the RV Cwith the insets on the SPG555 cone(the RV Cis keyed for proper orientation and will not seat flush or seal into the cone if the RV Cis not properly positioned).

3)Once the RV Cis seated to the cone, hand tighten the six screws, do notover-tightenthe screws.

1)The handle is held in place by two screws (included in the handle bag). The handle can be positioned on one of eight different ways .

2)Line up the handle with two of the six screw holes on the RVC. Using the provided 2.5mm tool, hand tighten the screws. The specific orientation of the handle will not effect performance, however, to ensure proper tuning, must be installed prior to using the SPG555.

Warning: Choose the position of the handle wisely. Installing the screws into the RVCwill mar the area around where the screw is installed. Although not visible with the handle installed in the original position, if the handle is moved, you will be able to see the enlarged screw holes from the previous install position.

 

SPS(Soft Part System)

Interchangeable SPS

The SPG555 features a removable SPS(Soft Part System) that contains the cone, surround, and spider built into one frame. In the event that the cone, surround, or spider becomes damaged, it is easily swapped out with a new one. Also, If the basket of the SPG555 is going to be visible, the SPScan be removed allowing for painting, plating, or powder coating of the chassis.

SPSRemoval Instructions

1 ) Remove the SPG555 from the subwoofer enclosure.

2 ) Remove the mounting gasket from the SPG555.

3 ) Remove the RV Cfrom the SPS(see previous page for removal instructions).

4)Remove the 8 short screws that secure the top of the SPSto the basket.

5)Remove the 6 long screws that secure the bottom of the SPSto the basket.

6)With all 14 screws removed, the SPSwill slide out.

SPSInstallation Instructions

1 ) Place the SPSin the basketmaking sure that the terminals are positioned on the correct side, the S P Suses a peg to assure proper alignment and will not properly seat if installed backwards.

2)Hand tighten the 8 short screws that secure the top of the SPSto the basket.

3)Hand tighten the 6 long screws that secure the bottom of the SPSto the basket.

4 ) Install the RV Cinto the SPS(see previous page for installation instructions). 5 ) Install the mounting gasketon the SPG555.

6 ) Install the SPG555 back into the subwoofer enclosure.

SPG555 Exploded View

Contact Information

Contacting Boston

For questions regarding installation or service, please contact the dealer from whom you have purchased the product or contact us directly at:

Boston Acoustics, Inc.

300 Jubilee Drive

Peabody, MA 01960

Phone #: 978-538-5000

Fax #: 978-538-5100


RVC and SPS are trademarks and Boston, Boston Acoustics, the Boston Acoustics logo, and RadialVent are registered trademarks of Boston Acoustics, Inc.

Specifications are subject to change without notice. ©2006 Boston Acoustics, Inc. All rights reserved.

Covered by patents issued and/or pending.

Boston Acoustics, Inc. 300 Jubilee Drive, Peabody, MA 01960 USA T: 978.538.5000 F: 978.538.5100 W: