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Introduction
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-pending 3.5-inch RV 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 C
™
and 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-inch sub-
w o o f e r. The area of the cone, 555cm
2
, is larger than a standard 12-inch subwoofer—simply put, greater cone area for
greater output. A 3.5-inch diameter 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-up requirements 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 of mind-blowing
bass, 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.
Specifications
General Specifications
Model: SPG555-4 SPG555-2
Nominal SD: 555cm
2
555cm
2
RMS Power Handling: 1000w 1000w
Impedance: 4
Ω
2
Ω
Frequency Response (±3dB in car): 20-350Hz 20-350Hz
Weight: 26 Lbs. 26 Lbs.
SPG555 Thiele-Small Parameters
Model: SPG555-4 SPG555-2
Fs (Hz): 31.90 29.68
Re (Ohms): 3 . 1 5 1 . 6 8
Qms: 11.66 11.70
Qes: 0.86 0.67
Qts: 0.80 0.63
Vas (Liters): 39.77 44.40
Mms (Grams): 276.7 286.20
Cms (µM/Newton): 89.9 99.9
Xmax (Mm): 22 22
Xmech (Mm): 49 49
Sd (CM
2
): 555 555
Bl (Tesla-M): 1 4 . 2 7 1 1 . 5 8
SPL Eff (dB @ 1w/1m): 83.6 84.2
SPL Sen (dB @ 2.83v): 8 7 . 7 9 1 . 0