Combined CBT1000 - CBT1000E Impedance
Written by Ernesto Hernandez
Updated at January 8th, 2026
Question:
Why doesn't the impedance change when you add the CBT1000E extender?
Answer:
The impedance of the CBT1000E alone is 8 ohms, but its frequency response does not extend above 1 kHz. So the combined CBT1000 + CBT1000E array is 4 ohms above 1 kHz (from the CBT1000cabinet alone) and is 4 ohms below 1 kHz (the paralleled 8 ohms impedances of the two cabinets in that frequency band). The result is that both the individual full-range cabinet by itself and the extended two cabinet system has a nominal impedance of 4 ohms. So when you add the CBT1000E extender, the overall impedance remains the same.