Embossed Gately Audio dustcap with paper cone stitched to a high roll surround. 

Black powder-coated GATELY engineered basket 

Dual Progressive nomex spiders with stitched flat wound tinsel leads connect to oversized push terminals. 

8” Shield subwoofers use a 2.5” 4 layer high temp copper wound while the voice coil.

Shield 8” have a motor structure that consists of a 2 layer Y35 ferrite magnet that measures 5.75” in diameter by 1” thick per slug. 

Mounting depth = 5.75"
Mounting diameter = 7.3125"
Outside diameter = 8.75"
Weight : 19 lbs

Recommended sealed enclosure = .3'-.4'
Recommended Ported enclosure = .55'-.8' 

Model: Shield 8 D2
f(s) = 35.63 Hz
Q(ts) = 0.4701
V(as) = 6.696 liters (0.2364 cubic feet)
SPL = 79.57 dB SPL 1W/1m
Nominal Diam. = 0 mm (8 in.)
R(e) = 4.286 Ohms
Q(es) = 0.5176
Piston Diam. = 158.8 mm (6.25 in.)
SPL = 82.28 dB SPL 2.83 Vrms
C(ms) = 0.000122 mm/N
Z(max) = 46.65 Ohms
L(e) = 3.832 mH at 1kHz
Q(ms) = 5.116
BL = 17.43
n(0) = 0.05579 %
M(ms) = 164 grams

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Model: Shield 8 D3
f(s) = 34.55 Hz
Q(ts) = 0.4986
V(as) = 7.795 liters (0.2753 cubic feet)
SPL = 79.51 dB SPL 1W/1m
Nominal Diam. = 0 mm (8 in.)
R(e) = 6.1 Ohms
Q(es) = 0.557
Piston Diam. = 158.8 mm (6.25 in.)
SPL = 80.69 dB SPL 2.83 Vrms
C(ms) = 0.000142 mm/N
Z(max) = 58.14 Ohms
L(e) = 4.849 mH at 1kHz
Q(ms) = 4.752
BL = 18.87
n(0) = 0.05505 %
M(ms) = 149.7 grams

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Model: Shield 8 D4
f(s) = 40.14 Hz
Q(ts) = 0.5674
V(as) = 6.037 liters (0.2132 cubic feet)
SPL = 79.76 dB SPL 1W/1m
Nominal Diam. = 0 mm (0 in.)

R(e) = 2.021 Ohms
Q(es) = 0.6382
Piston Diam. = 158.8 mm (6.25 in.)
SPL = 85.73 dB SPL 2.83 Vrms
C(ms) = 0.11 mm/N

Z(max) = 18.21 Ohms
L(e) = 0.5859 mH at 10kHz
Q(ms) = 5.115
BL = 10.7
n(0) = 0.05833 %
M(ms) = 143.3 grams