The input signal has its polarity reversed but doesn’t change otherwise. At the input stages, one channel has its line-level audio signal input inverted by an operational amplifier (op amp) integrated circuit.Here’s how amplifier bridging is made possible: In the diagram above, I’m using a car amplifier as an example, although other types are generally similar. Driving special speaker multi-setups like series or series-parallel designs for higher volume.ĭIAGRAM – How does a bridged amp make extra power?.Using two stereo amps to power a single speaker each for much more power output.A great example is using an old 2-channel amp to power a mono subwoofer.įor home stereo, public address (PA) systems, and general hi-fi, some of the most common uses are: Avoiding the need to buy additional amps if you’re reusing old electronics.Using one 4-channel amplifier as a 2 channel amp to drive component speakers with more power and lower distortion at high volumes.Powering both front or front and rear speakers and a single subwoofer from a single two or four channel amp.In the case of car audio installations, some of the most common uses are: What are bridged power amplifiers used for? This makes bridged amplifiers flexible for different speaker systems and especially for driving power-hungry bass subwoofers. The end result is effectively a mono amplifier with two times (or more) the power output of a single channel. When a pair of bridgeable amplifier outputs are wired to a single speaker in bridged mode, the two channels work in a push-pull fashion, sharing the speaker load impedance between them. While this feature is extremely common in car amplifiers, you can also find some home stereo amplifiers, PA amps, and other power amplifiers. Bridgeable amplifiers usually use the positive terminal of one channel and a negative terminal from the other channel for the speaker wiring connections. Can you bridge an amp without bridging built in?ĭIAGRAM – What is audio amplifier bridging?Īudio amplifier channel bridging is a built-in feature that allows two stereo amp channels to be wired as a single mono channel to provide maximum power.Setting the crossovers on a bridged amp. Speaker bridging total Ohm load examples.
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