*ALL SALES FINAL ON THIS SPEAKER PART. REFUND NOT AVAILABLE*
The TS18C-4 speaker part is an 18-Inch 900W woofer used in the Carvin TRx3118A Active Subwoofer

 TRx Series:
TRx3118A

TS18C-4 Specifications:

Frequency Response : 35Hz - 2.5kHz (-3dB)
Power : 900 Watts RMS
Sensitivity: 96dB 1W/1m
Magnet Structure : Ferrite Core
Basket Frame : Cast
Voice Coil : 4-inch
Impedance : 4 Ohms
NetWt  : 18 lbs
Warranty: 90 Days

Mechanical Specifications:

Overall Diameter: 18.7-inch
Baffle Cutout Diameter: 17.6-inch
Depth: 6.74-inch

Thiele & Small Parameters:

FS(Hz): 35
Re(Ω): 5.5
Qes: 0.45
Qms: 2.8
Qts: 0.39
Vas(L): 314
Sd(m2): 1288
Xmax(mm): ±6
Mms(gr): 156
B1: 20
Le@1K(mH): 1.53
Mmd(gr): 129
Cms(mm/N): 0.14
Rms(kg/s): 12