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9918c
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$999.00
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9918c - 18 Inch 9900 Series Subwoofer - Photo angled right to show left, including dustcap, surround, basket, and motor boot with DD AUDIO trademark adorning.
9918C - 18 Inch, 9900 Series Subwoofer - Photo angled top to bottom showing surround, part of dustcap and cone, basket and motor boot with trademark DD AUDIO logo adorning.
9918C - 18 Inch 9900 Series Subwoofer - Photo angled back to front down right side, showing motor heatsink, boot, basket, leads, all adorned in trademark DD AUDIO embossing.
Z318 (ESP)
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Z418 (ESP)
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MODEL / SPECS

MODEL / SPECS

9918c

Z318 (ESP)

Z418 (ESP)

Speaker Size (In)

18
18
18

Watts RMS

3200
4000
6000

Peak Power

9600
12000
18000

VCD (In)

4
3.35
4

Voice Coil Impedance

D1 / D2
D1 / D2
D1 / D2

Piston Diameter (In)

15.5
15 1/2
15 1/2

Fs (Hz)

26.24
N/A
N/A

Qms

2.265
N/A
N/A

Qes

0.5167
N/A
N/A

Qts

0.4705
N/A
N/A

Vas (Ltr)

161.9
N/A
N/A

Xmech (MM)

60
N/A
N/A

Xmax (MM)

32
N/A
N/A

Frame OD (In)

18.25
18 1/4
18 1/4

Frame OD w/ Gasket (In)

18.5
18 7/16
18 7/16

Mounting Diameter (In)

16.75
16 5/8
16 5/8

Mounting Depth (In)

11.875
12 9/16
12 7/16

Motor Diameter (In)

10.3125
9
10

Motor Depth (In)

4.5625
5 5/8
5 5/8

Displacement (CuFt)

0.46
0.48
N/A

Ported Enclosure (CuFt)

5.0 - 6.0
5.0 - 6.0
N/A

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