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Dimensions
Side View
Cut-out
Top View
Subwoofer Parts
SPS™
(Soft Part System)
Mounting Gasket
SPG555 Basket, Motor
Structure, and Heat Sink
RVC™
(Removable
Voice Coil)
™
RVC Gasket
Hardware
Mounting Screw
x 10
Long SPS™ Screw
x 6
Short SPS™ Screw
x 8
RVC™ Screw
x 6
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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
3
Recommended Enclosure Volume*:
Q-Tune (Highpass and Q Setting):
1.0 ft (28.3L)
25Hz @ 0.707
™†
Sealed Enclosure Example
Gross Volume:
1.0 ft3 (28.3L)
1
Internal Height (H):
Internal Width (W):
Internal Depth (D):
10 ⁄2" (26.7cm)
13" (33.0cm)
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-inch thick M.D.F. is recommended as a minimum
†Q-Tune™ is a feature found on Boston GT Amplifiers
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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
3
Recommended Enclosure Volume*:
Tuning Frequency:
Q-Tune (Highpass and Q Setting):
2.1 ft (59.4L)
33Hz
™†
31Hz @ 0.9
Sound Quality Ported Enclosure Example
Gross Volume:
2.1 ft3 (59.4L)
14" (35.6cm)
18" (45.7cm)
Internal Height (H):
Internal Width (W):
Internal Depth (D):
Slot Port Opening:
Port Length:
14" (35.6cm)
1
1 ⁄
4
x 14” (3.2 x 35.6cm)
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. Tuning
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*:
Tuning Frequency:
2.5 ft3 (70.8L)
38Hz
36Hz @ 1.2
Q-Tune™†: (Highpass and Q Setting)
High Output Ported Enclosure Example
3
Gross Volume:
2.5 ft (70.8L)
14" (35.6cm)
22" (55.9cm)
Internal Height (H):
Internal Width (W):
Internal Depth (D):
14" (36.8cm)
3
Slot Port Opening (PW): 1 ⁄
4
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.
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™
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 RVC is held in place with six screws. Using the provided tool (2.5mm allen hex), remove the six
screws around the outside of the RVC™ .
2) Once the screws are removed, pull up on the handle and the RVC™ will slide out .
Note: If the previous RVC™ was 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 RVC™ 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) Align the notches on the RVC™ with the insets on
™
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 per-
formance, however, to ensure proper tuning,
must be installed prior to using the SPG555.
the SPG555 cone (the RVC is keyed for proper
orientation and will not seat flush or seal into the
cone if the RVC™ is not properly positioned).
3) Once the RVC™ is seated to the cone, hand tighten
the six screws , do not over-tighten the screws.
Warning: Choose the position of the handle wisely.
Installing the screws into the RVC™ will 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.
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™
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 SPS™
can be removed allowing for painting, plating, or powder coating of the chassis.
™
SPS Removal Instructions
1) Remove the SPG555 from the subwoofer enclosure.
2) Remove the mounting gasket from the SPG555.
3) Remove the RVC™ from the SPS™ (see previous page for removal instructions).
4) Remove the 8 short screws that secure the top of the SPS™ to the basket .
™
5) Remove the 6 long screws that secure the bottom of the SPS to the basket .
™
6) With all 14 screws removed, the SPS will slide out.
™
SPS Installation Instructions
1) Place the SPS™ in the basket making sure that the terminals are positioned on the correct side, the
SPS™ uses 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 SPS™ to the basket .
3) Hand tighten the 6 long screws that secure the bottom of the SPS™ to the basket .
4) Install the RVC™ into the SPS™ (see previous page for installation instructions).
5) Install the mounting gasket on the SPG555.
6) Install the SPG555 back into the subwoofer enclosure.
SPG555 Exploded View
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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
Email: [email protected]
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: bostonacoustics.com
042-001968-0
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