How does it work| Amplifier mode| what is the bridge mode in power amplifier

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#amplifierconnection #stereoamplifier #amplifiermode #bridgemodeamplifier
A long time ago, I made the same video but it is noisy. Today, I decided make another video to replace it as I promised. Hope you like it!
By default, the power amplifier has 2 channels. They are often called the left channel and the other is the right channel. To feed the signal into 2 channels of an amplifier, we have some ways such as balance cable, and RCA cable. I fed the signal into two channels of an amplifier by an RCA cable. The left signal from the RCA cable is fed into the left channel. The right signal from the RCA cable is fed into the right channel.
Two channels separately amplify each signal, so that, you hear two dissimilar sounds that appear at two speakers. That is the stereo mode.
In parallel mode, the input signal only uses the left signal or right signal to all of the channels.
Suppose that the left signal is fed into channels, so that, the output signal of the left channel is the same as the output signal of the right channel.
You don't hear the difference between the two channels. That is the parallel mode.
In bridge mode, the input signal is the left signal or right signal. Assuming that the left signal is used, again. The left signal is fed into the left channel of the amplifier.
At the right channel, the signal left is inverted before it is fed into the right channel of the amplifier. At output terminal connectors, you will see two signals inverted phase.
If an oscilloscope is connected to two red terminal connectors, you see a double signal. In bridge mode, the speaker is connected to two red terminal connectors.

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Sorry for the long comment, just another thing: "dual" mode: I've seen in some of older car amps manuals connecting diagrams for this mode: speakers connected to right and left channels, and subwoofer connected - via passive subwoofer crossofer - basically in parallel with these speakers, just the sub connected to terminals which are for bridge mode (if the connection terminals are "ch1-L//ch2-R": "+/-//+/-", the left "+" and right "-" are for bridge mode, then to left "+" is connected the left speaker's "+" in parallel with sub's "+", to left "-" the left speaker's "-", to right "+" the right speaker's "+", to right "-" the right speakers "-" in parallel with the sub's "-"). Also in the manuals were 1 of these 2 notes - as example for the most common amps - which are stable at up from 2 ohms in stereo and up from 4 ohms in bridge : 1: speakers + sub needs to have at least 4 ohms, 2: if the speakers have 4 ohms each, sub needs to have 8, or if the sub have 4 ohms, speakers needs to have 8 each, and at both of these notes: 2 ohm speakers not allowed - the reason is obvious why. Also at some amps isnt recommended a passive crossover for the sub, but it is recommended to build a crossover system by wiring in series 2 caps with the 2 speakers, and a coil with the sub (to HPF the speakers, and have LPF/HPF at the same freq). If this wiring mode is working for those old amps, then for the new amps should work too, just I'm afraid of damaging the amp... What do you think? As a real example: manual of Sony XM-222MK2 amp's manual - I still have this amp - there is actually the "crossover-system dual mode" connection - just I can't share the link here - yt deletes my comment for some reason if I put here the link...

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