What are the functions of stereo, bridge and parallel connection of power amplifiers?

What are the functions of stereo, bridge and parallel connection of power amplifiers?

Stereo STE (stereo) refers to sound with a three-dimensional feel. The sounds produced in nature are stereo, but if we replay these stereo sounds after recording, amplification, etc., all the sounds will be emitted from one speaker, and the replayed sound (compared with the original sound source) will not be stereo. . At this time, since various sounds are emitted from the same speaker, the original sense of space (especially the sense of spatial distribution of sound groups) is also lost. This playback is claimed to be mono. If the entire system from recording to playback can restore the original sense of space to a certain extent (it is impossible to completely restore it), then this kind of playback sound with a certain degree of spatial distribution characteristics such as azimuth level is called sound technology. stereo.

Bridge BRI (bridge) is to push the two-channel amplification circuit to a set of speakers at the same time to increase the audio undistorted output voltage of the power amplifier, thereby increasing the power. Most professional audio amplifiers support bridge connection. Set the amplifier status to bridge mode (BTL) and then connect the speaker wiring across the output stages (positive pole) of the two channels, and the speakers are not grounded. As for the positive and negative phases, the power amplifier will have BTL positive and negative poles.

The bridge connection of the audio amplifier is to push the output ends of the two amplification lines to a set of loads (speakers or speaker systems) at the same time. When bridged, the audio waveforms output by the two amplification lines are in opposite phases and loaded on the speaker at the same time, so that the load has twice the audio voltage, thereby increasing the power four times (under the condition that the ideal current is sufficient and the load impedance is consistent . However, due to power limitations, the current cannot keep up, so the bridge connection is often not suitable for impedances lower than 8 ohms, so the output power is usually doubled).

Parallel PAR (parallel) refers to the use of two-channel bridging of the power amplifier into one channel. After the two-channel bridging into one channel, the output power is the sum of the two channels. The power is doubled, which can The power of the speakers being pushed is naturally doubled. The volume will be much louder, which is also the function and advantage of bridging. But you should also pay attention at this time. When the power is doubled, the current will also increase a lot, the heat generated by the power amplifier will be greater, and it will be easier to damage the speakers and power amplifiers. Under normal circumstances, when you don't need a lot of power, try to use the bridge output function as little as possible, and just use the stereo mode.