Serving as a replacement woofer for the Mackie SRM 450 versions 2 and 3, the Celestion TF1230S has an 8 Ohm impedance and a power output of 300 Watts RMS.
The Celestion K12H-100TC is a 12-inch twin cone driver with an RMS capacity of 100 watts and a nominal impedance of 8 ohms.
The Celestion K12H-200TC is a 12-inch twin cone driver with an RMS capacity of 200 watts and a nominal impedance of 8 ohms.