Will be updating this as we move along building one of each.

The copper coil is STANDARD on all new Z v.2 woofers -- it replaces the old 4-layer aluminum coil.

Each one will be relatively fresh with ~5 minutes of break-in time playing low frequencies on our bench 1500D.

Stock 2 Spider Suspension on each model with the standard 4-layer round wire biflair copper coils.

Measured with Woofer Tester II unit

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10" D2:

RE: 3.93 ohms

Fs: 44.8 Hz

Qes: 0.37

Qms: 8.59

Qts: 0.35

Le: 3.65 mH

Vas: 8.58 L

BL: 27.14 NA

Cms: 51.36 uM/N

Mms: 245 g

Sens: 85.04 dB

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10" D1:

RE: 2.29 ohms

Fs: 44.95 Hz

Qes: 0.33

Qms: 7.39

Qts: 0.31

Le: 2.57 mH

Vas: 7.61 L

BL: 23.19 NA

Cms: 45.59 uM/N

Mms: 274 g

Sens: 85.04 dB

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12" D2:

RE: 3.97 ohms

Fs: 36.13 Hz

Qes: 0.36

Qms: 8.58

Qts: 0.35

Le: 3.86 mH

Vas: 21.0 L

BL: 27.13 NA

Cms: 64.5 uM/N

Mms: 300.8 g

Sens: 86.14 dB

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12" D1:

RE: 2.30 ohms

Fs: 33.71 Hz

Qes: 0.31

Qms: 8.94

Qts: 0.30

Le: 2.75 mH

Vas: 22.68 L

BL: 22.41 N

Cms: 69.62 uM/N

Mms: 320 g

Sens: 86.31 dB

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15" D2:

RE: 3.94 ohms

Fs: 34.94 Hz

Qes: 0.36

Qms: 8.72

Qts: 0.35

Le: 4.00 mH

Vas: 57.18 L

BL: 27.42 NA

Cms: 64.95 uM/N

Mms: 319 g

Sens: 90.06 dB

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15" D1:

RE: 2.42 ohms

Fs: 33.29 Hz

Qes: 0.33

Qms: 8.43

Qts: 0.32

Le: 2.49 mH

Vas: 57.96 L

BL: 22.75 NA

Cms: 65.84 uM/N

Mms: 347 g

Sens: 89.83 dB

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18" D2:

RE: 4.08 ohms

Fs: 28.42 Hz

Qes: 0.41

Qms: 9.14

Qts: 0.39

Le: 3.89 mH

Vas: 139 L

BL: 27.80 NA

Cms: 71.56 uM/N

Mms: 438 g

Sens: 90.73 dB

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18" D1:

RE: 2.4 ohms

Fs: 27.97 Hz

Qes: 0.37

Qms: 9.00

Qts: 0.36

Le: 2.61 mH

Vas: 134.97 L

BL: 23.04 NA

Cms: 69.20 uM/N

Mms: 467 g

Sens: 90.78 dB