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There are times when using your amplifier that you may experience distorted sounds. In this case, the most common problem is the lousy bias tube. It may need to be re-biased or replaced.
Hence, if you know how to bias tube amp with multimeter, you can quickly solve your problem and extend the lifespan of your amp....

It’s unusual for factory radios to have low level or pre amp outputs. In this case, connecting a traditional amp with high level input radios would be difficult at first sight.
Traditional amplifiers and its RCA connections cannot support the high level signals coming from the speaker wires of the head unit. However, a special tool may be used to convert the speaker level signals to an amp-friendly low level input....

Monoblock amplifiers are known to have powerful outputs. These types amplify single channels or ‘mono’ that are two or even three times more powerful than stereo outputs of multi-channel amps.
Knowing how to tune a monoblock amp and connect it to a sub will surely amplify your car audio quality....

There are multiple ways to maximize the potential of amplifiers and speakers in your sound system.
One usual method is to connect 4 channel amp to components in varying configurations and arrangements. While it is not the usual and intended use for a 4 channel amplifier, one specific arrangement is using a 4 channel amp subwoofer alongside 4 speakers...