Bridging an amplifier means combining two amplifier channels to create one more powerful output channel. This is commonly used when extra power is needed for a single speaker or subwoofer.
For example, a 2-channel amplifier may normally power a left and right speaker. When bridged, those two channels can sometimes be combined to power one subwoofer with higher output. Some 4-channel amplifiers can also be used with two channels powering speakers and the other two channels bridged to run a subwoofer.
Bridging can be useful because it may allow one amplifier to support a more flexible system design. However, not every amplifier can be bridged, and the speaker or subwoofer impedance must be compatible with the amplifier’s bridged rating.
Impedance is especially important. An amplifier that is stable at 2 ohms per channel in normal stereo mode may only be safe at 4 ohms when bridged. If the connected load is too low, the amplifier may overheat, distort, shut down in protection mode or become damaged.
Because every amplifier is different, you should always check the manufacturer’s specifications before attempting to bridge channels. For the safest and best-performing result, speak with your nearest Focal Authorised Australian Dealer. A professional dealer can confirm whether bridging is suitable for your amplifier, speakers or subwoofer, and ensure your Focal car audio system is wired and tuned correctly.
