Compare VU meter to peak meter PPM. Scroll down to related links and look at "VU meter - Wikipedia" and "Peak meter - Wikipedia".
db is decibel and in communication it is the amplifying factor where in audio it is the volume of the sound
To make low volume sound into HIGH volume sound.
It makes the sounds louder So it amplifies (increases in size/volume/sound) of the audio
ideally "line out" on the receiver to "audio in" on the amplifier, left and right... If there isn't a "line out" use the the "audio out" but keep the volume on the receiver relatively low to prevent overdriving the inputs on the amplifier.
You connect your audio leads to the 'aux' input on the amplifier, and the other end to your 'headphones' port. Don't turn up the volume too high on the computer, it will distort. Set the computer volume, so that distortion doesn't occur and then control the volume on the amplifier.
A Class T amplifier will typically cost around $20 to $40. The Class T amplifier is a small amplifier that produce a great amount of audio volume for it size.
audio amplifier
dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad.
dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad.
Audio engineers talk about the "JND", which stands for "just notiecable difference", which is a 3 decibel gain. That 3 decibel gain requires a doubling of amplifier power. For an amp to sound, subjectively, "twice as loud" requires a tenfold increase in power (300 watts instead of 30 watts).The decibel scale is logarithmic, not arithmetic.
In audio look at an amplifier. It will be always a voltage amplifier.
dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad.