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

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

Adjustment keys BRI, STE, PAR of professional power amplifier

Stereo STE (stereo) refers to the sound with stereoscopic effect. The sounds in nature are stereo, but if we replay these stereo sounds after recording, amplifying, etc., all the sounds will come out from one speaker, and this replay sound (compared with the original sound source) is not stereo up. At this time, since all kinds of sounds are emitted from the same speaker, the original sense of space (especially the sense of spatial distribution of the sound group) also disappears. This playback is claimed to be monophonic. If the entire system from recording to playback can restore the original sense of space to a certain extent (it is impossible to restore it completely), then this kind of playback sound with a certain degree of spatial distribution characteristics such as azimuth level is called the sound technology in audio technology. stereo.

Bridging BRI (bridge) is to push the amplifier circuits of two channels to a group of speakers at the same time, so as to increase the audio undistorted output voltage value of the power amplifier, thereby increasing the power. Most professional audio power amplifiers support bridging. Turn the state of the power amplifier to bridge mode (BTL) and then the speaker wiring is connected across the output stage (positive pole) of the two channels, and the speaker is not grounded. As for the positive and negative phase, the power amplifier will have the positive and negative poles of BTL.

The bridging of the audio power amplifier is to push the output terminals of the two amplified lines to a set of loads (speakers or speaker systems) at the same time. When bridging, the audio waveforms output by the two amplified lines are in reverse phase, and are loaded on the speaker at the same time, so that the load has twice the audio voltage, thereby increasing the power by four times (under the condition that the ideal current is sufficient and the load impedance is consistent But in fact, due to power limitation, 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) means that the two-channel bridge of the power amplifier is used as one channel. After the two-channel bridge is connected as one channel, the output power is the sum of the two channels, and the power is doubled. The boosted speaker power is naturally doubled. The volume will be much louder, which is also the role and advantage of bridging. But you should also pay attention at this time, if the power is doubled, the current will also increase a lot, the heat generated by the power amplifier will be greater, and it is more likely to damage the speakers and power amplifier. In general, when you don't need a lot of power, try to use the bridge output function as little as possible, or use the stereo mode.